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Villajos JA, Balderas-Xicohténcatl R, Al Shakhs AN, Berenguer-Murcia Á, Buckley CE, Cazorla-Amorós D, Charalambopoulou G, Couturas F, Cuevas F, Fairen-Jimenez D, Heinselman KN, Humphries TD, Kaskel S, Kim H, Marco-Lozar JP, Oh H, Parilla PA, Paskevicius M, Senkovska I, Shulda S, Silvestre-Albero J, Steriotis T, Tampaxis C, Hirscher M, Maiwald M. Establishing ZIF-8 as a reference material for hydrogen cryoadsorption: An interlaboratory study. Chemphyschem 2024; 25:e202300794. [PMID: 38165137 DOI: 10.1002/cphc.202300794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Revised: 12/28/2023] [Accepted: 01/02/2024] [Indexed: 01/03/2024]
Abstract
Hydrogen storage by cryoadsorption on porous materials has the advantages of low material cost, safety, fast kinetics, and high cyclic stability. The further development of this technology requires reliable data on the H2 uptake of the adsorbents, however, even for activated carbons the values between different laboratories show sometimes large discrepancies. So far no reference material for hydrogen cryoadsorption is available. The metal-organic framework ZIF-8 is an ideal material possessing high thermal, chemical, and mechanical stability that reduces degradation during handling and activation. Here, we distributed ZIF-8 pellets synthesized by extrusion to 9 laboratories equipped with 15 different experimental setups including gravimetric and volumetric analyzers. The gravimetric H2 uptake of the pellets was measured at 77 K and up to 100 bar showing a high reproducibility between the different laboratories, with a small relative standard deviation of 3-4 % between pressures of 10-100 bar. The effect of operating variables like the amount of sample or analysis temperature was evaluated, remarking the calibration of devices and other correction procedures as the most significant deviation sources. Overall, the reproducible hydrogen cryoadsorption measurements indicate the robustness of the ZIF-8 pellets, which we want to propose as a reference material.
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Affiliation(s)
- Jose A Villajos
- Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin, Germany
- Centro Ibérico de Investigación en Almacenamiento Energético (CIIAE), Cáceres, Spain
| | - Rafael Balderas-Xicohténcatl
- Max Planck Institute for Intelligent Systems, Stuttgart, Germany
- Current address: Bauhaus Luftfahrt e.V., Münnchen, Germany
| | - Ali N Al Shakhs
- The Adsorption & Advanced Materials Laboratory (A2ML), Department of Chemical Engineering & Biotechnology, University of Cambridge, Cambridge, UK
| | | | | | | | | | - Fabrice Couturas
- Université Paris Est Creteil (CNRS-ICMPE-UMR7182), Thiais, France
| | - Fermin Cuevas
- Université Paris Est Creteil (CNRS-ICMPE-UMR7182), Thiais, France
| | - David Fairen-Jimenez
- The Adsorption & Advanced Materials Laboratory (A2ML), Department of Chemical Engineering & Biotechnology, University of Cambridge, Cambridge, UK
| | | | | | - Stefan Kaskel
- Technische Universität Dresden (TUD), Dresden, Germany
| | - Hyunlim Kim
- Ulsan National Institute of Science and Technology (UNIST), Ulsan, South Korea
| | | | - Hyunchul Oh
- Ulsan National Institute of Science and Technology (UNIST), Ulsan, South Korea
| | | | | | | | - Sarah Shulda
- National Renewable Energy Laboratory (NREL), Denver, USA
| | | | - Theodore Steriotis
- National Center for Scientific Research "Demokritos" (NCSRD), Athens, Greece
| | - Christos Tampaxis
- National Center for Scientific Research "Demokritos" (NCSRD), Athens, Greece
| | - Michael Hirscher
- Max Planck Institute for Intelligent Systems, Stuttgart, Germany
- Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai, Japan
| | - Michael Maiwald
- Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin, Germany
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Chung PYJ, Dhillon SK, Simoens C, Cuypers L, Laenen L, Bonde J, Corbisier P, Buttinger G, Cocuzza CE, Van Gucht S, Van Ranst M, Arbyn M. Assessment of the clinical and analytical performance of three Seegene Allplex SARS-CoV-2 assays within the VALCOR framework. Microbiol Spectr 2024; 12:e0239723. [PMID: 38189291 PMCID: PMC10846132 DOI: 10.1128/spectrum.02397-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Accepted: 12/05/2023] [Indexed: 01/09/2024] Open
Abstract
The coronavirus disease 2019 (COVID-19) pandemic demonstrated the need for accurate diagnostic testing for the early detection of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Although the pandemic has ended, accurate assays are still needed to monitor viral spread at national levels and beyond through population and wastewater surveillance. To enhance early detection, SARS-CoV-2 assays should have high diagnostic accuracy and should be validated to assure accurate results. Three distinct SARS-CoV-2 assays were evaluated with clinical samples using the VALCOR (VALidation of SARS-CORona Virus-2 assays) framework, with the TaqPath COVID-19 assay (ThermoFisher Scientific, USA) as a comparator. We evaluated clinical sensitivity, specificity, limit of detection (LOD), and overall concordance between comparator and three index Allplex SARS-CoV-2 assays (Seegene, South Korea): Allplex-SC2, Allplex-SC2Fast (Fast PCR), and Allplex-SC2FabR (SARS-CoV-2/FluA/FluB/respiratory syncytial virus). Analytical performance and LOD of index assays were assessed using a dilution series of three synthetic SARS-CoV-2 sequence reference materials (RMs). Ninety SARS-CoV-2 positives and 90 SARS-CoV-2 negatives were tested. All Allplex assays had 100.0% sensitivity (95%CI = 95.9%-100.0%). Allplex-SC2 and Allplex-SC2Fast assays had 97.8% specificity (95%CI = 92.3%-99.7%) and 98.9% overall concordance [κ = 0.978 (95%CI = 0.947-1.000)]. Allplex-SC2FabR assay showed 100.0% specificity (95%CI = 95.9%-100.0%) and 100.0% overall concordance [κ = 1.000 (95%CI = 1.000-1.000)]. LOD assessment of index assays revealed detection down to 2.61 × 102 copies/mL in clinical samples, while the analytical LOD was 9.00 × 102 copies/mL. In conclusion, the evaluation of the three Seegene Allplex SARS-CoV-2 assays showed high sensitivity and specificity and an overall good assay concordance with the comparator. The assays showed low analytical LOD using RM and even a slightly lower LOD in clinical samples. Non-overlapping target gene sequences between SARS-CoV-2 assays and RMs emphasize the need for aligning targeted sequences of diagnostic assays and RMs.IMPORTANCEThe coronavirus disease 2019 pandemic has a significant impact on global public health, economies, and societies. As shown through the first phases of the pandemic, accurate and timely diagnosis is crucial for disease control, prevention, and monitoring. Though the pandemic phase of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has concluded, diagnostic assays remain in demand to monitor SARS-CoV-2 at the individual patient level, regionally, and nationally, as well as to remain an infectious disease preparedness instrument to monitor any new SARS-CoV-2 dissemination across borders using population and wastewater surveillance. The anticipation by WHO and central health care policy entities such as the Center for Disease Control, EMA, and multiple national health authorities is that SARS-CoV-2 will reside as an endemic respiratory disease for years to come. The key strategic consideration is hence shifting from combating a pandemic situation with a high number of patients to instead allowing precise diagnostics of suspected patients with the intention of correct management in a low-prevalence setting.
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Affiliation(s)
- Pui Yan Jenny Chung
- Unit of Cancer Epidemiology, Belgian Cancer Centre, Sciensano, Brussels, Belgium
| | - Sharonjit K. Dhillon
- Unit of Cancer Epidemiology, Belgian Cancer Centre, Sciensano, Brussels, Belgium
| | - Cindy Simoens
- Unit of Cancer Epidemiology, Belgian Cancer Centre, Sciensano, Brussels, Belgium
| | - Lize Cuypers
- Department of Laboratory Medicine, National Reference Centre for Respiratory Pathogens, University Hospitals Leuven, Leuven, Belgium
- Laboratory of Clinical Microbiology, Department of Microbiology, Immunology and Transplantation, KU Leuven, Leuven, Belgium
| | - Lies Laenen
- Department of Laboratory Medicine, National Reference Centre for Respiratory Pathogens, University Hospitals Leuven, Leuven, Belgium
- Laboratory of Clinical Microbiology, Department of Microbiology, Immunology and Transplantation, KU Leuven, Leuven, Belgium
| | - Jesper Bonde
- Molecular Pathology Laboratory, Department of Pathology, AHH-Hvidovre Hospital, Copenhagen University Hospital, Copenhagen, Denmark
| | | | | | - Clementina E. Cocuzza
- Laboratory of Clinical Microbiology and Virology, Department of Medicine and Surgery, University of Milano-Bicocca, Monza, Italy
| | | | - Marc Van Ranst
- Laboratory of Clinical and Epidemiological Virology, Department of Microbiology, Immunology and Transplantation, Rega Institute for Medical Research, KU Leuven, Leuven, Belgium
| | - Marc Arbyn
- Unit of Cancer Epidemiology, Belgian Cancer Centre, Sciensano, Brussels, Belgium
- Department of Human Structure and Repair, Faculty of Medicine and Health Sciences, University of Ghent, Ghent, Belgium
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Hildebrandt J, Taubert A, Thünemann AF. Synthesis and Characterization of Ultra-Small Gold Nanoparticles in the Ionic Liquid 1-Ethyl-3-methylimidazolium Dicyanamide, [Emim][DCA]. ChemistryOpen 2024; 13:e202300106. [PMID: 37650312 PMCID: PMC10853075 DOI: 10.1002/open.202300106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Revised: 08/11/2023] [Indexed: 09/01/2023] Open
Abstract
We report on gold clusters with around 62 gold atoms and a diameter of 1.15±0.10 nm. Dispersions of the clusters are long-term stable for two years at ambient conditions. The synthesis was performed by mixing tetrachloroauric acid (HAuCl4 ⋅ 3 H2 O) with the ionic liquid 1-ethyl-3-methylimidazolium dicyanamide ([Emim][DCA]) at temperatures of 20 to 80 °C. Characterization was performed with small-angle X-ray scattering (SAXS), UV-Vis spectroscopy, and MALDI-TOF mass spectrometry. A three-stage model is proposed for the formation of the clusters, in which cluster growth from gold nuclei takes place according to the Lifshitz-Slyozov-Wagner (LSW) model followed by oriented attachment to form colloidal stable clusters.
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Affiliation(s)
- Jana Hildebrandt
- Bundesanstalt für Materialforschung und -prüfung (BAM)Unter den Eichen 8712205BerlinGermany
- Institute of ChemistryUniversity of Potsdam14476PotsdamGermany
| | - Andreas Taubert
- Institute of ChemistryUniversity of Potsdam14476PotsdamGermany
| | - Andreas F. Thünemann
- Bundesanstalt für Materialforschung und -prüfung (BAM)Unter den Eichen 8712205BerlinGermany
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de Ruijter VN, Hof M, Kotorou P, van Leeuwen J, van den Heuvel-Greve MJ, Roessink I, Koelmans AA. Microplastic Effect Tests Should Use a Standard Heterogeneous Mixture: Multifarious Impacts among 16 Benthic Invertebrate Species Detected under Ecologically Relevant Test Conditions. Environ Sci Technol 2023; 57:19430-19441. [PMID: 37992256 DOI: 10.1021/acs.est.3c06829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2023]
Abstract
Microplastics require a risk assessment framework that takes their multidimensionality into account while exclusively considering robust data. Therefore, effect tests should use a diverse, environmentally relevant microplastic (ERMP) standard material that adheres to high-quality requirements. In this study, we provide chronic dose-effect relationships and effect thresholds for 16 benthic species exposed to ERMP. The ERMP was created from plastic items collected from natural sources and cryogenically milled to represent the diversity of microplastics. The test design met 20 previously published quality assurance and quality control criteria. Adverse effect thresholds (EC10) were determined at ERMP concentrations of 0.11 ± 0.17% sediment dry weight (Gammarus pulex, growth), 0.49 ± 0.68% sediment dry weight (Lumbriculus variegatus, growth), and 1.90 ± 1.08% sediment dry weight (L. variegatus, reproduction). A positive effect of microplastics, such as decreased mortality, was observed for Cerastoderma edule (EC10 = 0.021 ± 0.027% sediment dry weight) and Sphaerium corneum (EC10 = 7.67 ± 3.41% sediment dry weight), respectively. Several of these laboratory-based single-species effect thresholds for ERMP occurred at concentrations lower than those found in the environment. For other species, no significant effects were detected up to an ERMP dose of 10% dry weight.
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Affiliation(s)
- Vera N de Ruijter
- Aquatic Ecology and Water Quality Management Group, Wageningen University, Post Office Box 47, 6700 AA Wageningen, Netherlands
| | - Matthias Hof
- Aquatic Ecology and Water Quality Management Group, Wageningen University, Post Office Box 47, 6700 AA Wageningen, Netherlands
| | - Petranta Kotorou
- Aquatic Ecology and Water Quality Management Group, Wageningen University, Post Office Box 47, 6700 AA Wageningen, Netherlands
| | - Jesse van Leeuwen
- Wageningen Marine Research, Wageningen University & Research, Post Office Box 77, 4400 AB Yerseke, Netherlands
| | | | - Ivo Roessink
- Wageningen Environmental Research, Wageningen University & Research, Post Office Box 47, 6700 AA Wageningen, Netherlands
| | - Albert A Koelmans
- Aquatic Ecology and Water Quality Management Group, Wageningen University, Post Office Box 47, 6700 AA Wageningen, Netherlands
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Chen G, Li H, Gao Y, Zhao H, Yang J, Dong L. Establishment of Digital PCR Method and Reference Material for Adenoviruses 40 and 41. Foodborne Pathog Dis 2023; 20:453-459. [PMID: 37590500 DOI: 10.1089/fpd.2023.0011] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/19/2023] Open
Abstract
Coinfection with human adenovirus (HAdV) and SARS-CoV-2 has been associated with acute hepatitis in children with unknown etiology. Similar cases have been reported in many countries, and HAdV 40 and HAdV 41 have been identified. The quantification method is established based on digital PCR (dPCR) for HAdV 40/41, which is more convenient for low-concentration virus detection. The limit of detections of HAdV 40/41 dPCR were 4 and 5 copies/μL. Pseudovirus reference material (RM) that contains the highly conserved HEXON gene was developed and quantified with the dPCR method. The assigned values with expanded uncertainty were (1.43 ± 0.35) × 103 copies/μL for HAdV 40 RM and (1.21 ± 0.28) × 103 copies/μL for HAdV 41 RM. The values could be reproduced on multiple platforms. The dPCR method and pseudovirus RMs contribute to the improved accuracy of HAdV 40/41 detection, which is crucial for clinical diagnosis.
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Affiliation(s)
- Guifang Chen
- Center for Advanced Measurement Science, National Institute of Metrology, Beijing, China
| | - Huijie Li
- Shenzhen Institute for Technology Innovation, National Institute of Metrology, Shenzhen, China
| | - Yunhua Gao
- Center for Advanced Measurement Science, National Institute of Metrology, Beijing, China
| | - Hang Zhao
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, China
| | - Jiayi Yang
- Center for Advanced Measurement Science, National Institute of Metrology, Beijing, China
| | - Lianhua Dong
- Center for Advanced Measurement Science, National Institute of Metrology, Beijing, China
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Lyle AN, Budd JR, Kennerley VM, Smith BN, Danilenko U, Pfeiffer CM, Vesper HW. Assessment of WHO 07/202 reference material and human serum pools for commutability and for the potential to reduce variability among soluble transferrin receptor assays. Clin Chem Lab Med 2023; 61:1719-1729. [PMID: 37071928 DOI: 10.1515/cclm-2022-1198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Accepted: 04/04/2023] [Indexed: 04/20/2023]
Abstract
OBJECTIVES The clinical use of soluble transferrin receptor (sTfR) as an iron status indicator is hindered by a lack of assay standardization and common reference ranges and decision thresholds. In 2009, the WHO and National Institute for Biological Standards and Controls (NIBSC) released a sTfR reference material (RM), 07/202, for assay standardization; however, a comprehensive, formal commutability study was not conducted. METHODS This study evaluated the commutability of WHO 07/202 sTfR RM and human serum pools and the impacts of their use as common calibrators. Commutability was assessed for six different measurement procedures (MPs). Serum pools were prepared according to updated CLSI C37-A procedures (C37) or non-C37 procedures. The study design and analyses were based on Parts 2 and 3 of the 2018 IFCC Commutability in Metrological Traceability Working Group's Recommendations for Commutability Assessment. WHO 07/202 and serum pools were used for instrument/assay and mathematical recalibration, respectively, to determine if their use decreases inter-assay measurement variability for clinical samples. RESULTS The WHO 07/202 RM dilutions were commutable for all 6 MPs assessed and, when used for instrument calibration, decreased inter-assay variability from 208 to 55.7 %. Non-C37 and C37 serum pools were commutable for all 6 MPs assessed and decreased inter-assay variability from 208 to 13.8 % and 4.6 %, respectively, when used for mathematical recalibration. CONCLUSIONS All materials evaluated, when used as common calibrators, substantially decreased inter-assay sTfR measurement variability. MP calibration to non-C37 and C37 serum pools may reduce the sTfR IMPBR to a greater extent than WHO 07/202 RM.
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Affiliation(s)
- Alicia N Lyle
- Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | | | - Victoria M Kennerley
- Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | | | - Uliana Danilenko
- Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Christine M Pfeiffer
- Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Hubert W Vesper
- Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA, USA
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Cumeras R, Shen T, Valdiviez L, Tippins Z, Haffner BD, Fiehn O. Differences in the Stool Metabolome between Vegans and Omnivores: Analyzing the NIST Stool Reference Material. Metabolites 2023; 13:921. [PMID: 37623865 PMCID: PMC10456543 DOI: 10.3390/metabo13080921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 07/27/2023] [Accepted: 08/03/2023] [Indexed: 08/26/2023] Open
Abstract
To gain confidence in results of omic-data acquisitions, methods must be benchmarked using validated quality control materials. We report data combining both untargeted and targeted metabolomics assays for the analysis of four new human fecal reference materials developed by the U.S. National Institute of Standards and Technologies (NIST) for metagenomics and metabolomics measurements. These reference grade test materials (RGTM) were established by NIST based on two different diets and two different samples treatments, as follows: firstly, homogenized fecal matter from subjects eating vegan diets, stored and submitted in either lyophilized (RGTM 10162) or aqueous form (RGTM 10171); secondly, homogenized fecal matter from subjects eating omnivore diets, stored and submitted in either lyophilized (RGTM 10172) or aqueous form (RGTM 10173). We used four untargeted metabolomics assays (lipidomics, primary metabolites, biogenic amines and polyphenols) and one targeted assay on bile acids. A total of 3563 compounds were annotated by mass spectrometry, including 353 compounds that were annotated in more than one assay. Almost half of all compounds were annotated using hydrophilic interaction chromatography/accurate mass spectrometry, followed by the lipidomics and the polyphenol assays. In total, 910 metabolites were found in at least 4-fold different levels in fecal matter from vegans versus omnivores, specifically for peptides, amino acids and lipids. In comparison, only 251 compounds showed 4-fold differences between lyophilized and aqueous fecal samples, including DG O-34:0 and methionine sulfoxide. A range of diet-specific metabolites were identified to be significantly different between vegans and omnivores, exemplified by citrinin and C17:0-acylcarnitine for omnivores, and curcumin and lenticin for vegans. Bioactive molecules like acyl alpha-hydroxy-fatty acids (AAHFA) were differentially regulated in vegan versus omnivore fecal materials, highlighting the importance of diet-specific reference materials for dietary biomarker studies.
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Affiliation(s)
- Raquel Cumeras
- West Coast Metabolomics Center, University of California Davis, Davis, CA 95616, USA; (R.C.)
- Oncology Department, Institut d’Investigació Sanitària Pere Virgili (IISPV), Univeristat Rovira i Virgili (URV), 43204 Reus, Spain
- Nutrition and Metabolism Department, Institut d’Investigació Sanitària Pere Virgili (IISPV), Univeristat Rovira i Virgili (URV), 43204 Reus, Spain
| | - Tong Shen
- West Coast Metabolomics Center, University of California Davis, Davis, CA 95616, USA; (R.C.)
| | - Luis Valdiviez
- West Coast Metabolomics Center, University of California Davis, Davis, CA 95616, USA; (R.C.)
| | - Zakery Tippins
- West Coast Metabolomics Center, University of California Davis, Davis, CA 95616, USA; (R.C.)
| | - Bennett D. Haffner
- West Coast Metabolomics Center, University of California Davis, Davis, CA 95616, USA; (R.C.)
| | - Oliver Fiehn
- West Coast Metabolomics Center, University of California Davis, Davis, CA 95616, USA; (R.C.)
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Zhang R, Xu Z, Zhao R, Fu W, Song Y, Wang Q, Yue Y. Accurate method for value assignment of carcinoembryonic antigen reference materials. J Clin Lab Anal 2023; 37:e24936. [PMID: 37395487 PMCID: PMC10431395 DOI: 10.1002/jcla.24936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Revised: 05/29/2023] [Accepted: 06/09/2023] [Indexed: 07/04/2023] Open
Abstract
BACKGROUND In this study, we explored the commutability of reference materials (RMs) for carcinoembryonic antigen (CEA), selected the appropriate diluent matrix of the first International Reference Preparation (IRP) 73/601 of the World Health Organization (WHO 73/601) for CEA, and improved the comparability of CEA measurement results among different assay systems. METHODS Forty serum samples were divided into five aliquots. WHO 73/601 was diluted into nine concentrations using five diluents with different components, and the candidate RMs for CEA at five concentrations (C1-C5) were prepared by the Beijing Clinical Laboratory Center (BCCL). The samples were analyzed via five automated CEA immunoassays. RESULTS Carcinoembryonic antigen candidate RMs were commutable among all immunoassays based on the CLSI approach and among 7 of 10 assay combinations based on the IFCC approach. WHO 73/601 diluted in phosphate-buffered saline (PBS) was commutable among all assays based on the CLSI approach and among 5 of 10 pairwise comparisons based on the IFCC approach with correction of bias at diluted concentrations, except for the lowest concentration, which had the smallest variation among systems. The median percentage biases among assays were decreased after calibration. CONCLUSION The BCCL candidate RMs (C2-C5) for CEA were commutable among all immunoassays. WHO 73/601 RMs diluted in a PBS buffer matrix were selected as common calibrators for five immunoassays, which reduced bias, thereby effectively improving the harmonization of CEA detection; therefore, they could be used to assign values to CEA candidate RMs developed by BCCL. Our findings promote the harmonization of CEA detection in immunoassays.
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Affiliation(s)
- Rui Zhang
- Department of Clinical Laboratory, Beijing Chao‐yang HospitalCapital Medical UniversityBeijingChina
| | - Zhenzhen Xu
- Department of Clinical Laboratory, Beijing Chao‐yang HospitalCapital Medical UniversityBeijingChina
| | - Rui Zhao
- Department of Clinical Laboratory, Beijing Chao‐yang HospitalCapital Medical UniversityBeijingChina
| | - Wenxuan Fu
- Department of Clinical Laboratory, Beijing Chao‐yang HospitalCapital Medical UniversityBeijingChina
| | - Yichuan Song
- Department of Clinical Laboratory, Beijing Chao‐yang HospitalCapital Medical UniversityBeijingChina
| | - Qingtao Wang
- Department of Clinical Laboratory, Beijing Chao‐yang HospitalCapital Medical UniversityBeijingChina
- Beijing Center for Clinical LaboratoriesBeijingChina
| | - Yuhong Yue
- Department of Clinical Laboratory, Beijing Chao‐yang HospitalCapital Medical UniversityBeijingChina
- Beijing Center for Clinical LaboratoriesBeijingChina
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Baoutina A, Bhat S, Li DK, Emslie KR. Towards a robust test to detect gene doping for anabolic enhancement in human athletes. Drug Test Anal 2023; 15:314-323. [PMID: 36445200 DOI: 10.1002/dta.3411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Revised: 11/08/2022] [Accepted: 11/16/2022] [Indexed: 12/03/2022]
Abstract
Success in gene therapy in treating human disease makes this technology attractive to enhance athletic performance, creating the need for gene doping detection. In 2021, World Anti-Doping Agency (WADA) approved the first gene doping test. Here, we describe a new method to detect doping with four additional genes, follistatin, growth hormone 1, growth hormone-releasing hormone and insulin-like growth factor 1, that may improve performance by increasing muscle size and strength. The method utilises four hydrolysis probe-based polymerase chain reaction (PCR) assays that target the transgenes based on the coding sequence of the four endogenous genes. The assays are specific, reproducible and capable to detect five copies of transgene in the presence of very similar endogenous gene in 25,000 times excess. To underpin reliable and comparable routine method performance by doping testing laboratories, a synthetic reference material for the method was designed and generated following the ISO Guide 35. The complete method was validated in blood samples using plasma as extraction matrix and QIAamp DNA blood midi DNA extraction kit. All blood samples from different donors (n = 8) simulated to be negative or positive (1500 transgene copies spiked per millilitre of blood) for the transgenes were reported correctly. The new method that targets four additional genes will extend the capabilities of laboratories involved in doping control to protect athletes' health, fairness and equality.
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Affiliation(s)
- Anna Baoutina
- National Measurement Institute (NMI), Sydney, New South Wales, Australia
| | - Somanath Bhat
- National Measurement Institute (NMI), Sydney, New South Wales, Australia
| | - Desmond K Li
- National Measurement Institute (NMI), Sydney, New South Wales, Australia
| | - Kerry R Emslie
- National Measurement Institute (NMI), Sydney, New South Wales, Australia
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Streckenbach B, Sakas J, Perkins N, Kohler M, Moeller A, Zenobi R. A gas-phase standard delivery system for direct breath analysis. J Breath Res 2022; 17. [PMID: 36579824 DOI: 10.1088/1752-7163/acab79] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Accepted: 12/14/2022] [Indexed: 12/15/2022]
Abstract
Applications for direct breath analysis by mass spectrometry (MS) are rapidly expanding. One of the more recent mass spectrometry-based approaches is secondary electrospray ionization coupled to high-resolution mass spectrometry (SESI-HRMS). Despite increasing usage, the SESI methodology still lacks standardization procedures for quality control and absolute quantification. In this study, we designed and evaluated a custom-built standard delivery system tailored for direct breath analysis. The system enables the simultaneous introduction of multiple gas-phase standard compounds into ambient MS setups in the lower parts-per-million (ppm) to parts-per-billion (ppb) range. To best mimic exhaled breath, the gas flow can be heated (37 °C-40 °C) and humidified (up to 98% relative humidity). Inter-laboratory comparison of the system included various SESI-HRMS setups, i.e. an Orbitrap and a quadrupole time-of-flight mass spectrometer (QTOF), and using both single- as well as multi-component standards. This revealed highly stable and reproducible performances with between-run variation <19% and within-run variation <20%. Independent calibration runs demonstrated high accuracy (96%-111%) and precision (>95%) for the single-compound standard acetone, while compound-specific performances were obtained for the multi-component standard. Similarly, the sensitivity varied for different compounds within the multi-component standard across all SESI-Orbitrap and -QTOF setups, yielding limits of detections from 3.1 ppb (forp-xylene) to 0.05 ppb (for 1,8-cineol). Routinely applying the standard system throughout several weeks, allowed us to monitor instrument stability and to identify technical outliers in exhaled breath measurements. Such routine deployment of standards would significantly improve data quality and comparability, which is especially important in longitudinal and multi-center studies. Furthermore, performance validation of the system demonstrated its suitability for reliable absolute quantification while it illustrated compound-dependent behavior for SESI.
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Affiliation(s)
- Bettina Streckenbach
- Department of Chemistry and Applied Biosciences, ETH Zurich, Zurich, Switzerland
| | - Justinas Sakas
- Department of Chemistry and Applied Biosciences, ETH Zurich, Zurich, Switzerland.,EaStCHEM School of Chemistry, University of Edinburgh, Edinburgh, United Kingdom
| | - Nathan Perkins
- Division of Clinical Chemistry and Biochemistry, University Children's Hospital Zurich, Zurich, Switzerland
| | - Malcolm Kohler
- Department of Pulmonology, University Hospital Zurich, Zurich, Switzerland
| | - Alexander Moeller
- Division of Respiratory Medicine, University Children's Hospital Zurich, Zurich, Switzerland
| | - Renato Zenobi
- Department of Chemistry and Applied Biosciences, ETH Zurich, Zurich, Switzerland
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11
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Zhou L, Riegler T, Bonnetti C, McClenaghan S, Kamber B. Revisiting the Happy Jack Uraninite Reference Material: A Combined Electron Beam and Laser Ablation In Situ Study. Geostand Geoanal Res 2022; 46:735-749. [PMID: 37067871 PMCID: PMC10091993 DOI: 10.1111/ggr.12457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Revised: 06/30/2022] [Accepted: 08/11/2022] [Indexed: 06/19/2023]
Abstract
This new comprehensive in situ mineral-chemical characterisation of the Happy Jack uraninite has discovered additional information regarding matrix effects and trace element homogeneity, relevant to proposals that it could serve as a reference material (RM). On the LA-ICP-MS instrumentation used, there was an absence of discernible matrix effects relative to the silicate glass NIST SRM 610. Lanthanides and Y are found to be very homogeneously distributed in Happy Jack uraninite, Zr, Nb and Ti mass fractions reproducible but only within individual fragments, and other elements still generally heterogeneous. This means that the Happy Jack uraninite can serve as a secondary RM for quality control in studies of natural uraninites. In terms of absolute accuracy and intermediate measurement precision, the Happy Jack uraninite can be used for the homogeneous elements. For elements that are homogeneous within individual fragments only, intermediate measurement precision can still be evaluated, while information values will be obtained for the generally heterogeneous elements. Two distinct groups (high vs. low Zr) were distinguished to exist among different Happy Jack fragments in association with minor variation of REE mass fractions, which possibly explains the observed (heavy) REE discrepancy between in situ laser ablation and bulk solution ICP-MS analyses.
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Affiliation(s)
- Lingli Zhou
- iCRAGSchool of Earth SciencesUniversity College Dublin, BelfieldDublin 4Ireland
- Geological Survey Ireland, Beggars BushDublin 4Ireland
- iCRAG, School of Natural Sciences, Department of GeologyTrinity College DublinDublin 2Ireland
| | - Thomas Riegler
- iCRAG, School of Natural Sciences, Department of GeologyTrinity College DublinDublin 2Ireland
| | - Christophe Bonnetti
- State Key Laboratory of Nuclear Resources and EnvironmentEast China University of TechnologyNanchangJiangxi330013China
| | - Sean McClenaghan
- iCRAG, School of Natural Sciences, Department of GeologyTrinity College DublinDublin 2Ireland
| | - Balz Kamber
- iCRAG, School of Natural Sciences, Department of GeologyTrinity College DublinDublin 2Ireland
- School of Earth and Atmospheric Sciences Queensland University of TechnologyBrisbaneQLD4001Australia
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12
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Kaufmann M, Vaysse PM, Savage A, Amgheib A, Marton A, Manoli E, Fichtinger G, Pringle SD, Rudan JF, Heeren RMA, Takáts Z, Balog J, Porta Siegel T. Harmonization of Rapid Evaporative Ionization Mass Spectrometry Workflows across Four Sites and Testing Using Reference Material and Local Food-Grade Meats. Metabolites 2022; 12:1130. [PMID: 36422272 PMCID: PMC9699633 DOI: 10.3390/metabo12111130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 11/08/2022] [Accepted: 11/10/2022] [Indexed: 11/19/2022] Open
Abstract
Rapid evaporative ionization mass spectrometry (REIMS) is a direct tissue metabolic profiling technique used to accurately classify tissues using pre-built mass spectral databases. The reproducibility of the analytical equipment, methodology and tissue classification algorithms has yet to be evaluated over multiple sites, which is an essential step for developing this technique for future clinical applications. In this study, we harmonized REIMS methodology using single-source reference material across four sites with identical equipment: Imperial College London (UK); Waters Research Centre (Hungary); Maastricht University (The Netherlands); and Queen's University (Canada). We observed that method harmonization resulted in reduced spectral variability across sites. Each site then analyzed four different types of locally-sourced food-grade animal tissue. Tissue recognition models were created at each site using multivariate statistical analysis based on the different metabolic profiles observed in the m/z range of 600-1000, and these models were tested against data obtained at the other sites. Cross-validation by site resulted in 100% correct classification of two reference tissues and 69-100% correct classification for food-grade meat samples. While we were able to successfully minimize between-site variability in REIMS signals, differences in animal tissue from local sources led to significant variability in the accuracy of an individual site's model. Our results inform future multi-site REIMS studies applied to clinical samples and emphasize the importance of carefully-annotated samples that encompass sufficient population diversity.
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Affiliation(s)
- Martin Kaufmann
- Department of Surgery, Queen’s University, Kingston, ON K7L 2V7, Canada
- Department of Biomedical and Molecular Sciences, Queen’s University, Kingston, ON K7L 3N6, Canada
| | - Pierre-Maxence Vaysse
- Maastricht MultiModal Molecular Imaging (M4i) Institute, Division of Imaging Mass Spectrometry, Maastricht University, 6229 ER Maastricht, The Netherlands
- Department of Surgery, Maastricht University Medical Center + (MUMC+), 6229 HX Maastricht, The Netherlands
- Department of Otorhinolaryngology, Head & Neck Surgery, MUMC+, 6229 HX Maastricht, The Netherlands
| | - Adele Savage
- Division of Computational and Systems Medicine, Department of Surgery and Cancer, Imperial College London, London SW7 2BX, UK
| | - Ala Amgheib
- Division of Computational and Systems Medicine, Department of Surgery and Cancer, Imperial College London, London SW7 2BX, UK
| | | | - Eftychios Manoli
- Division of Computational and Systems Medicine, Department of Surgery and Cancer, Imperial College London, London SW7 2BX, UK
| | - Gabor Fichtinger
- School of Computing, Queen’s University, Kingston, ON K7L 2N8, Canada
| | | | - John F. Rudan
- Department of Surgery, Queen’s University, Kingston, ON K7L 2V7, Canada
| | - Ron M. A. Heeren
- Maastricht MultiModal Molecular Imaging (M4i) Institute, Division of Imaging Mass Spectrometry, Maastricht University, 6229 ER Maastricht, The Netherlands
| | - Zoltán Takáts
- Division of Computational and Systems Medicine, Department of Surgery and Cancer, Imperial College London, London SW7 2BX, UK
| | - Júlia Balog
- Division of Computational and Systems Medicine, Department of Surgery and Cancer, Imperial College London, London SW7 2BX, UK
- Waters Research Center, 1031 Budapest, Hungary
| | - Tiffany Porta Siegel
- Maastricht MultiModal Molecular Imaging (M4i) Institute, Division of Imaging Mass Spectrometry, Maastricht University, 6229 ER Maastricht, The Netherlands
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13
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Braga F, Pasqualetti S, Frusciante E, Borrillo F, Chibireva M, Panteghini M. Harmonization Status of Serum Ferritin Measurements and Implications for Use as Marker of Iron-Related Disorders. Clin Chem 2022; 68:1202-1210. [PMID: 35794075 DOI: 10.1093/clinchem/hvac099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Accepted: 05/06/2022] [Indexed: 11/13/2022]
Abstract
BACKGROUND Serum ferritin is considered a suitable biomarker of iron-related disorders. However, data about the comparability of results among commercial measuring systems (MSs) are contradictory. We performed an intercomparison study aimed at verifying the current interassay variability and its impact on clinical application of the test. Obtaining this information is vital because manufacturers continue to claim calibration alignment to different WHO preparations, which are not related to each other in terms of traceability. METHODS Four widely used MSs were evaluated. The interassay agreement was verified using 39 human serum pools. The recovery of WHO International Standard (IS) 94/572 (the only reference material available at the time of the study) was evaluated, after assessing the material commutability. Finally, an approach for harmonizing ferritin results was proposed. RESULTS Highly significant differences (P < 0.00001) among ferritin concentrations assayed by different MSs were detected and the interassay CV (median 22.9%; interquartile range 21.8-25.5) overlapped the desirable intermethod bias (24.6%). IS 94/572 was commutable for use only with Access and Centaur, with Access being the only MS correctly recovering its assigned value. Accordingly, we used regression data against Access to recalibrate MSs, indirectly aligning them to IS 94/572, with a substantial improvement in degree of harmonization and traceability to higher-order reference. CONCLUSIONS The harmonization among evaluated ferritin MSs is far from optimal, with the implementation of traceability to different WHO ISs being a factor of confusion. A recalibration approach, however, would permit measurement harmonization, allowing the use of common decision thresholds.
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Affiliation(s)
- Federica Braga
- Research Centre for Metrological Traceability in Laboratory Medicine (CIRME), Università degli Studi di Milano, Milan, Italy
| | - Sara Pasqualetti
- Research Centre for Metrological Traceability in Laboratory Medicine (CIRME), Università degli Studi di Milano, Milan, Italy
| | - Erika Frusciante
- Research Centre for Metrological Traceability in Laboratory Medicine (CIRME), Università degli Studi di Milano, Milan, Italy
| | - Francesca Borrillo
- Research Centre for Metrological Traceability in Laboratory Medicine (CIRME), Università degli Studi di Milano, Milan, Italy
| | - Mariia Chibireva
- Research Centre for Metrological Traceability in Laboratory Medicine (CIRME), Università degli Studi di Milano, Milan, Italy
| | - Mauro Panteghini
- Research Centre for Metrological Traceability in Laboratory Medicine (CIRME), Università degli Studi di Milano, Milan, Italy
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14
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Ntziouni A, Thomson J, Xiarchos I, Li X, Bañares MA, Charitidis C, Portela R, Lozano Diz E. Review of Existing Standards, Guides, and Practices for Raman Spectroscopy. Appl Spectrosc 2022; 76:747-772. [PMID: 35311368 DOI: 10.1177/00037028221090988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Over the past decades Raman spectroscopy has been extensively used both on an industrial and academic level. This has resulted in the development of numerous specialized Raman techniques and Raman active products, which in turn has led to the adoption and development of standards and norms pertaining to Raman unit's calibration, performance validation, and interoperability. Purpose of the present review is to list, classify, and engage in a comprehensive analysis of the different standards, guides, and practices relating to Raman spectroscopy. Primary aim of the review is to consider the commonalities and conflicts between these standards and norms and to identify any missing aspects. Standardization in the field of Raman spectroscopy is dominated by the work of American institutions, namely, the American Society of Testing Materials (ASTM or ASTM International), with several active standards in place pertaining to terminology, calibration, multivariate analysis, and specific applications, and the National Institute of Standards and Technology (NIST), providing numerous certified reference materials, referred to as standard reference materials. The industrial application of Raman spectroscopy is dominated by the pharmaceutical industry. As such, pharmacopoeias provide not only important information in relation to pharmaceutical-related applications of Raman spectroscopy, but also invaluable insight, into the basic principles of Raman spectroscopy and important aspects that include calibration, validation, measurement, and chemometric analysis processes, usually by referring to ASTM and NIST standards. Given the fact that Raman spectroscopy is a modern and innovative field, the standardization processes are complex and constantly evolving. Despite the seemingly high number of existing standards, the standardization landscape is incomplete and has not been modernized according to the developments in Raman spectroscopy techniques in recent years. This is evident by the lack of protocols for numerous areas as well as by the fact that some of the existing standards have not been updated to reflect the advances in the technique. Therefore, it is important for the Raman community to actively engage in and contribute to a modernization process that will result in updating existing and introducing new terms, protocols, and guides. Indeed, the development of optimized common standards would be extremely beneficial and would further foster the development and application of Raman spectroscopy techniques, most notably those of surface enhanced Raman spectroscopy and low-resolution portable analyzers.
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Affiliation(s)
- Afroditi Ntziouni
- School of Chemical Engineering-Research Lab of Advanced, Composite, Nano Materials, and Nanotechnology (RNANO Lab), 68994National Technical University of Athens (NTUA), Athens, Greece
| | | | - Ioannis Xiarchos
- School of Chemical Engineering-Research Lab of Advanced, Composite, Nano Materials, and Nanotechnology (RNANO Lab), 68994National Technical University of Athens (NTUA), Athens, Greece
| | - Xiang Li
- Institute of Catalysis and Petrochemistry (ICP), 16379Spanish National Council for Scientific Research (CSIC), Madrid, Spain
| | - Miguel A Bañares
- Institute of Catalysis and Petrochemistry (ICP), 16379Spanish National Council for Scientific Research (CSIC), Madrid, Spain
| | - Costas Charitidis
- School of Chemical Engineering-Research Lab of Advanced, Composite, Nano Materials, and Nanotechnology (RNANO Lab), 68994National Technical University of Athens (NTUA), Athens, Greece
| | - Raquel Portela
- Institute of Catalysis and Petrochemistry (ICP), 16379Spanish National Council for Scientific Research (CSIC), Madrid, Spain
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15
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Van Hoovels L, Studholme L, Vander Cruyssen B, Sieghart D, Bonroy C, Nagy E, Pullerits R, Čučnik S, Dahle C, Heijnen I, Bernasconi L, Benkhadra F, Bogaert L, Van Den Bremt S, Van Liedekerke A, Vanheule G, Robbrecht J, Wirth C, Müller R, Kyburz D, Sjöwall C, Kastbom A, Ješe R, Jovancevic B, Kiss E, Jacques P, Aletaha D, Steiner G, Verschueren P, Bossuyt X. Standardisation of ACPA tests: evaluation of a new candidate reference preparation. Ann Rheum Dis 2022; 81:annrheumdis-2021-221849. [PMID: 35697487 PMCID: PMC9484372 DOI: 10.1136/annrheumdis-2021-221849] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2021] [Accepted: 05/19/2022] [Indexed: 11/03/2022]
Abstract
INTRODUCTION Commercial assays measuring antibodies to citrullinated protein/peptide (ACPA) show poor quantitative agreement. The diagnostic industry has never adopted the International Union of Immunological Societies-Centers for Disease Control and Prevention (IUIS-CDC) ACPA reference standard. Recently, the National Institute for Biological Standards and Control (NIBSC) prepared a new candidate ACPA standard (18/204). We evaluated both reference materials using different commercially available ACPA assays. MATERIALS AND METHODS This is an international study in which the NIBSC candidate ACPA standard and the IUIS-CDC ACPA reference material were analysed together with 398 diagnostic samples from individuals with rheumatoid arthritis (RA) and in 1073 individuals who did not have RA using nine commercial ACPA assays. RESULTS For both reference materials and samples from individuals with RA and individuals who did not have RA, there were large differences in quantitative ACPA results between assays. For most assays, values for the IUIS-CDC standard were lower than values for NIBSC 18/204 and the IUIS-CDC/NIBSC ratio was comparable for several, but not all assays. When NIBSC 18/204 was used as a calibrator, an improvement in alignment of ACPA results across several of the evaluated assays was obtained. Moreover, NIBSC 18/204 could align clinical interpretation for some but not all assays. CONCLUSION Adoption of an international standard for ACPA determination is highly desirable. The candidate NIBSC 18/204 standard improved the standardisation and alignment of most ACPA assays and might therefore be recommended to be used as reference in commercial assays.
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Affiliation(s)
- Lieve Van Hoovels
- Department of Microbiology, Immunology and Transplantation, KU Leuven, Leuven, Belgium
- Department of Laboratory Medicine, Onze-Lieve-Vrouwziekenhuis Aalst, Aalst, Belgium
| | - Lucy Studholme
- NIBSC, National Institute for Biological Standards and Control, Potters Bar, UK
| | | | - Daniela Sieghart
- Division of Rheumatology, Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Carolien Bonroy
- Department of Internal Medicine, Ghent University, Ghent, Belgium
- Department of Diagnostic Sciences, Ghent University, Ghent, Belgium
| | - Eszter Nagy
- Department of Laboratory Medicine, National Institute of Locomotor Diseases and Disabilities, Budapest, Hungary
| | - Rille Pullerits
- Department of Clinical Immunology and Transfusion Medicine, Sahlgrenska University Hospital, Gothenburg, Sweden
- Department of Rheumatology, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
| | - Sasa Čučnik
- Department of Rheumatology, University Medical Centre Ljubljana, Ljubljana, Slovenia
| | - Charlotte Dahle
- Division of Inflammation and Infection, Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden
| | - Ingmar Heijnen
- Department of Laboratory Medicine, University Hospital Basel, Basel, Switzerland
| | - Luca Bernasconi
- Department of Laboratory Medicine, Kantonsspital Aarau, Aarau, Switzerland
| | - Farid Benkhadra
- Department of Laboratory Medicine, Centre Hospitalier de Luxembourg, Luxembourg, Luxembourg
| | - Laura Bogaert
- Department of Laboratory Medicine, Onze-Lieve-Vrouwziekenhuis Aalst, Aalst, Belgium
| | | | - Ann Van Liedekerke
- Department of Laboratory Medicine, AZ Sint-Elisabeth Ziekenhuis Zottegem vzw, Zottegem, Belgium
| | - Geert Vanheule
- Department of Laboratory Medicine, AZ Rivierenland, Bornem, Antwerpen, Belgium
| | - Johan Robbrecht
- Department of Laboratory Medicine, AZ Sint-Lucas Bruges, Bruges, Belgium
| | - Claudine Wirth
- Department of Rheumatology, Centre Hospitalier de Luxembourg, Luxembourg, Luxembourg
| | | | - Diego Kyburz
- Department of Rheumatology, University Hospital Basel, Basel, Switzerland
| | - Christopher Sjöwall
- Division of Inflammation and Infection, Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden
| | - Alf Kastbom
- Division of Inflammation and Infection, Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden
| | - Rok Ješe
- Department of Rheumatology, University Medical Centre Ljubljana, Ljubljana, Slovenia
| | - Boja Jovancevic
- Department of Rheumatology, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
| | - Emese Kiss
- Department of Clinical Immunology, Adult and Pediatric Rheumatology, National Institute of Locomotor Diseases and Disabilities, Budapest, Hungary
| | - Peggy Jacques
- Department of Rheumatology and VIB Inflammation Research Center, University Hospital Ghent, Ghent, Belgium
| | - Daniel Aletaha
- Division of Rheumatology, Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Günter Steiner
- Division of Rheumatology, Internal Medicine III, Medical University of Vienna, Vienna, Austria
- Ludwig Boltzmann Institute for Arthritis and Rehabilitation, Vienna, Austria
| | - Patrick Verschueren
- Division of Rheumatology, University Hospital Leuven, Leuven, Belgium
- Department of Development and Regeneration KU Leuven, Skeletal Biology and Engineering Research Center, University Hospital Leuven, Leuven, Belgium
| | - Xavier Bossuyt
- Department of Microbiology, Immunology and Transplantation, KU Leuven, Leuven, Belgium
- Department of Laboratory Medicine, University Hospital Leuven, Leuven, Belgium
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16
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Markus C, Tan RZ, Lim CY, Rankin W, Matthews SJ, Loh TP, Hague WM. Performance of four regression frameworks with varying precision profiles in simulated reference material commutability assessment. Clin Chem Lab Med 2022; 60:1164-1174. [PMID: 35647783 DOI: 10.1515/cclm-2022-0205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2022] [Accepted: 05/12/2022] [Indexed: 11/15/2022]
Abstract
OBJECTIVES One approach to assessing reference material (RM) commutability and agreement with clinical samples (CS) is to use ordinary least squares or Deming regression with prediction intervals. This approach assumes constant variance that may not be fulfilled by the measurement procedures. Flexible regression frameworks which relax this assumption, such as quantile regression or generalized additive models for location, scale, and shape (GAMLSS), have recently been implemented, which can model the changing variance with measurand concentration. METHODS We simulated four imprecision profiles, ranging from simple constant variance to complex mixtures of constant and proportional variance, and examined the effects on commutability assessment outcomes with above four regression frameworks and varying the number of CS, data transformations and RM location relative to CS concentration. Regression framework performance was determined by the proportion of false rejections of commutability from prediction intervals or centiles across relative RM concentrations and was compared with the expected nominal probability coverage. RESULTS In simple variance profiles (constant or proportional variance), Deming regression, without or with logarithmic transformation respectively, is the most efficient approach. In mixed variance profiles, GAMLSS with smoothing techniques are more appropriate, with consideration given to increasing the number of CS and the relative location of RM. In the case where analytical coefficients of variation profiles are U-shaped, even the more flexible regression frameworks may not be entirely suitable. CONCLUSIONS In commutability assessments, variance profiles of measurement procedures and location of RM in respect to clinical sample concentration significantly influence the false rejection rate of commutability.
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Affiliation(s)
- Corey Markus
- Flinders University International Centre for Point-of-Care Testing, Flinders Health and Medical Research Institute, Bedford Park, Australia
| | - Rui Zhen Tan
- Engineering Cluster, Singapore Institute of Technology, Singapore, Singapore
| | - Chun Yee Lim
- Engineering Cluster, Singapore Institute of Technology, Singapore, Singapore
| | - Wayne Rankin
- Chemical Pathology Directorate, SA Pathology, Adelaide, Australia.,Endocrine and Metabolic Unit, Royal Adelaide Hospital, Adelaide, Australia.,Adelaide Medical School, The University of Adelaide, Adelaide, Australia
| | - Susan J Matthews
- Flinders University International Centre for Point-of-Care Testing, Flinders Health and Medical Research Institute, Bedford Park, Australia
| | - Tze Ping Loh
- Department of Laboratory Medicine, National University Hospital, Singapore, Singapore
| | - William M Hague
- Robinson Research Institute, The University of Adelaide, Adelaide, Australia
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17
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Peng R, Lin G, Li L, Li J. Development of a Novel Reference Material for Tumor Mutational Burden Measurement Based on CRISPR/Cas9 Technology. Front Oncol 2022; 12:845636. [PMID: 35574377 PMCID: PMC9098197 DOI: 10.3389/fonc.2022.845636] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Accepted: 04/08/2022] [Indexed: 12/03/2022] Open
Abstract
As a biomarker that affects treatment decisions of immune checkpoint inhibitors, the accuracy, reliability, and comparability of tumor mutational burden (TMB) estimation is of paramount importance. To improve the consistency and reliability of these tests, qualified reference materials providing ground-truth data are crucial. In this study, we developed a set of formalin-fixed and paraffin-embedded (FFPE) samples with different TMB values as the novel reference materials for TMB estimation. By introducing several clinically relevant variants in MutS Homolog 2 (MSH2) gene and DNA polymerase epsilon (POLE) gene into human cell lines using CRISPR/Cas9 technology, we first constructed four typical cell lines which verified with hypermutator or ultramutator phenotype. Followed by cell mixing and paraffin embedding, the novel FFPE samples were prepared. It was confirmed that our novel FFPE samples have sufficient quantity of cells, high reproducibility, and they can provide matched wild type sample as the genetic background. The double-platform whole exome sequencing validation showed that our FFPE samples were also highly flexible as they containing different TMB values spanning a clinically relevant range (2.0–106.1 mut/Mb). Without limitations on production and TMB values, our novel FFPE samples based on CRISPR/Cas9 editing are suitable as candidate reference materials. From a practical point of view, these samples can be used for the validation, verification, internal quality control, and proficiency testing of TMB assessment.
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Affiliation(s)
- Rongxue Peng
- National Center for Clinical Laboratories, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing Hospital/National Center of Gerontology, Beijing, China
| | - Guigao Lin
- National Center for Clinical Laboratories, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing Hospital/National Center of Gerontology, Beijing, China
| | - Lin Li
- National Center for Clinical Laboratories, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing Hospital/National Center of Gerontology, Beijing, China
| | - Jinming Li
- National Center for Clinical Laboratories, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing Hospital/National Center of Gerontology, Beijing, China
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18
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Lingxiao S, Jinfei M, Qingqing Y, Pengyun L, Huafen L. The application of certified reference materials for clinical mass spectrometry. J Clin Lab Anal 2022; 36:e24301. [PMID: 35274770 PMCID: PMC8993636 DOI: 10.1002/jcla.24301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 02/07/2022] [Accepted: 02/08/2022] [Indexed: 11/10/2022] Open
Abstract
Background In the application process of clinical mass spectrometry, there are difficulties such as standardization, low degree of automation, complex instruments, and high requirements for operations, which will affect the accuracy and comparability of results. Reference materials are one of the major approaches to achieve measurement accuracy and metrological comparability. Methods Based on the problems of reference materials in clinical mass spectrometry, the precautions for the use of reference materials are summarized in the aspects of measurement method validation, calibrator usage, and quality control in this article. Additionally, combined with the previous experience of the author's laboratory, the operation mode and acceptance criteria of the new calibration solution lot replacement were formulated to ensure the continuous comparability of the measurement system. Conclusion Carefully understand and correctly regulate the use and management of reference materials to ensure the accuracy of test results, thereby improving the comparability and consistency of results between laboratories.
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Affiliation(s)
- Shen Lingxiao
- Hangzhou Calibra Diagnostics Co., LTD, Hangzhou, China
| | - Ma Jinfei
- Hangzhou Calibra Diagnostics Co., LTD, Hangzhou, China
| | - Yang Qingqing
- Hangzhou Calibra Diagnostics Co., LTD, Hangzhou, China
| | - Liu Pengyun
- Hangzhou Calibra Diagnostics Co., LTD, Hangzhou, China
| | - Liu Huafen
- Hangzhou Calibra Diagnostics Co., LTD, Hangzhou, China
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Huang X, Ahola H, Daly M, Nitride C, Mills ENC, Sontag-Strohm T. Quantification of Barley Contaminants in Gluten-Free Oats by Four Gluten ELISA Kits. J Agric Food Chem 2022; 70:2366-2373. [PMID: 35156817 PMCID: PMC8880376 DOI: 10.1021/acs.jafc.1c07715] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Pure oats are generally accepted to be safe for most celiac patients, and consumption of oats provides advantageous dietary fibers. However, oats can be contaminated by gluten proteins from wheat, barley, and/or rye. The analytical challenge lies in the reliability of the quantification method and how to maintain the contamination level under a gluten-free food threshold of 20 mg/kg. In this study, we investigated barley-spiked oat flour samples at four levels using four gluten ELISA kits. The largest recovery variance was with the R5 kit that gave 5-6 times overestimation; the G12 kit cross-reacted with oat proteins and gave 4-5 times overestimation at all spiked levels. The Total Gluten and Morinaga kits gave satisfactory recoveries. Total barley hordeins were isolated and characterized to be used as a common calibrator in all four kits aiming at harmonizing the results and to test the kits' performance. Immunoblotting of total hordein isolate revealed that Total Gluten and Morinaga antibodies provided an overall detection, while R5 and G12 antibodies recognized specific hordein groups leading to a larger difference when wheat and barley were used as the calibrant. Calibration with total hordein isolate corrected the overestimation problem and decreased the variability between the four gluten kits.
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Affiliation(s)
- Xin Huang
- Department
of Food and Nutrition, Faculty of Agriculture and Forestry, University of Helsinki, FI-00014 Helsinki, Finland
| | - Hanna Ahola
- Department
of Food and Nutrition, Faculty of Agriculture and Forestry, University of Helsinki, FI-00014 Helsinki, Finland
| | - Matthew Daly
- Manchester
Institute of Biotechnology, Division of Infection, Immunity and Respiratory
Medicine, Faculty of Biology, Medicine and Health, University of Manchester, Manchester M17DN, U.K.
| | - Chiara Nitride
- Manchester
Institute of Biotechnology, Division of Infection, Immunity and Respiratory
Medicine, Faculty of Biology, Medicine and Health, University of Manchester, Manchester M17DN, U.K.
- Department
of Agricultural Sciences, University of
Naples Federico II, 80055 Portici, Italy
| | - EN Clare Mills
- Manchester
Institute of Biotechnology, Division of Infection, Immunity and Respiratory
Medicine, Faculty of Biology, Medicine and Health, University of Manchester, Manchester M17DN, U.K.
| | - Tuula Sontag-Strohm
- Department
of Food and Nutrition, Faculty of Agriculture and Forestry, University of Helsinki, FI-00014 Helsinki, Finland
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20
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Tozaki T, Ohnuma A, Kikuchi M, Ishige T, Kakoi H, Hirota KI, Kusano K, Nagata SI. Design and storage stability of reference materials for microfluidic quantitative PCR-based equine gene doping tests. J Equine Sci 2022; 32:125-134. [PMID: 35023990 PMCID: PMC8731687 DOI: 10.1294/jes.32.125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Accepted: 09/17/2021] [Indexed: 11/01/2022] Open
Abstract
One method of gene doping in horseracing is administering of exogenous genetic materials, known as transgenes. Several polymerase chain reaction (PCR)-based methods have been developed for detecting transgenes with high sensitivity and specificity. However, novel designs for reference materials (RMs) and/or positive template controls (PTCs) are necessary for simultaneous analysis of multiple transgene targets. In this study, we designed and developed a novel RM for simultaneously detecting multiple targets via microfluidic quantitative PCR (MFQPCR). Twelve equine genes were selected as targets in this study. A sequence region including primers and probes for quantitative PCR was designed, and a 10 bp sequence was inserted to allow the RM to be distinguished from the original transgene sequences. The sequences of individual detection sites were then connected for 12 genes and cloned into a single plasmid vector. We performed fragment size analysis to distinguish between the PCR products of the original transgene sequence and those of the RM, enabling identification of RM contamination. PTCs diluted to 10,000, 1,000, 100, and 10 copies/µl with horse genomic DNA from RM were stably stored at 4°C for 1 year. As digital PCR enabled absolute quantification, the designed substances can serve as an RM. These findings indicate that the RM design and storage conditions were suitable for gene doping tests using MFQPCR.
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Affiliation(s)
- Teruaki Tozaki
- Genetic Analysis Department, Laboratory of Racing Chemistry, Tochigi 320-0851, Japan
| | - Aoi Ohnuma
- Genetic Analysis Department, Laboratory of Racing Chemistry, Tochigi 320-0851, Japan
| | - Mio Kikuchi
- Genetic Analysis Department, Laboratory of Racing Chemistry, Tochigi 320-0851, Japan
| | - Taichiro Ishige
- Genetic Analysis Department, Laboratory of Racing Chemistry, Tochigi 320-0851, Japan
| | - Hironaga Kakoi
- Genetic Analysis Department, Laboratory of Racing Chemistry, Tochigi 320-0851, Japan
| | - Kei-Ichi Hirota
- Genetic Analysis Department, Laboratory of Racing Chemistry, Tochigi 320-0851, Japan
| | - Kanichi Kusano
- Equine Department, Japan Racing Association, Tokyo 106-8401, Japan
| | - Shun-Ichi Nagata
- Genetic Analysis Department, Laboratory of Racing Chemistry, Tochigi 320-0851, Japan
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21
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Panteghini M, Braga F, Camara JE, Delatour V, Van Uytfanghe K, Vesper HW, Zhang T. Optimizing Available Tools for Achieving Result Standardization: Value Added by Joint Committee on Traceability in Laboratory Medicine (JCTLM). Clin Chem 2021; 67:1590-1605. [PMID: 34633037 DOI: 10.1093/clinchem/hvab178] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Accepted: 08/12/2021] [Indexed: 12/14/2022]
Abstract
BACKGROUND The JCTLM created a Task Force on Reference Measurement System Implementation (TF-RMSI) to provide guidance on metrological traceability implementation for the in vitro diagnostics (IVD) community. CONTENT TF-RMSI investigated the reference measurement systems (RMS) for 13 common measurands by applying the following procedural steps: (a) extracting data from the JCTLM database of available certified reference materials (CRMs) and reference measurement procedures (RMPs); (b) describing the RMS to which each recruited CRM or RMP belongs; (c) identifying the intended use of the CRMs, and, if used as a common calibrator for IVD measuring systems and/or trueness assessment of field methods was included, checking the CRM's certificate for information about commutability with clinical samples; and (d) checking if the CRM or RMP measurement uncertainty (MU) has the potential to be small enough to avoid significantly affecting the analytical performance specifications (APS) for MU of clinical sample results when the MU from the IVD calibrator and from the end-user measuring system were combined. SUMMARY We produced a synopsis of JCTLM-listed higher-order CRMs and RMPs for the selected measurands, including their main characteristics for implementing traceability and fulfilling (or not) the APS for suitable MU. Results showed that traceability to higher-order references can be established by IVD manufacturers within the defined APS for most of the 13 selected measurands. However, some measurands do not yet have suitable CRMs for use as common calibrators. For these measurands, splitting clinical samples with a laboratory performing the RMP may provide a practical alternative for establishing a calibration hierarchy.
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Affiliation(s)
- Mauro Panteghini
- 'L. Sacco' Department of Biomedical and Clinical Sciences, Research Centre for Metrological Traceability in Laboratory Medicine (CIRME), University of Milan, Milano, Italy
| | - Federica Braga
- 'L. Sacco' Department of Biomedical and Clinical Sciences, Research Centre for Metrological Traceability in Laboratory Medicine (CIRME), University of Milan, Milano, Italy
| | - Johanna E Camara
- Chemical Sciences Division, National Institute of Standards and Technology, Gaithersburg, MD
| | - Vincent Delatour
- Chemistry and Biology Division, Laboratoire National de Metrologie et d'Essais (LNE), Paris, France
| | - Katleen Van Uytfanghe
- Ref4U-Laboratory of Toxicology, Department of Bioanalysis, Faculty of Pharmaceutical Sciences, Ghent University, Ghent, Belgium
| | - Hubert W Vesper
- Division of Laboratory Sciences, Centers for Disease Control and Prevention, Atlanta, GA
| | - Tianjiao Zhang
- Division of clinical chemistry, National Center for Clinical Laboratories, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing, China
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22
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Bianco K, Sherwin EB, Konigshofer Y, Girsen AI, Sylvester KG, Garlick RK. Novel Approaches to Develop Critical Reference Materials for Noninvasive Prenatal Testing: A Pilot Study. J Appl Lab Med 2021; 6:1492-1504. [PMID: 34080621 DOI: 10.1093/jalm/jfab037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Accepted: 03/29/2021] [Indexed: 11/13/2022]
Abstract
BACKGROUND Highly characterized reference materials are required to expand noninvasive prenatal testing (NIPT) for low incidence aneuploidies and microdeletions. The goal of this study was to develop reference materials for the development of next generation circulating cell-free DNA (ccfDNA) assays. METHODS This was a prospective study of pregnancies complicated by positive prenatal genetic screening. ccfDNA was isolated from maternal plasma and amplified. Lymphoblastoid cell lines were prepared from maternal peripheral blood mononuclear cells and fetal cord blood cells. Cells were Epstein-Barr virus immortalized and expanded. Amplified DNA and to a limited extent formulated lymphoblastoid-derived ccfDNA was tested in SNP-based and chromosome counting (CC) based massively parallel sequencing assays. RESULTS Enrolled cases included fetuses with: T21 (2), T18 (1), T18-XXX (1), XYY (1), microdeletions (1), and euploid (2). Three lymphoblastoid cells lines were prepared. Genomic DNA was extracted from cell lines and fragmented to simulate ccfDNA. ccfDNA isolation yielded about 2000 usable genome equivalents of DNA for each case for amplification. Although the sonicated genomic DNA derived from lymphoblastoid cell lines did not yield results compatible with NIPT assays, when blinded, NIPT platforms correctly identified the amplified ccfDNA isolated from blood in the majority of cases. CONCLUSIONS This study showed that maternal blood samples from pregnancies complicated by common chromosomal abnormalities can be used to generate materials for the development and evaluation of NIPT assays.
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Affiliation(s)
- Katherine Bianco
- Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Stanford University School of Medicine, Stanford, CA, USA
| | - Elizabeth B Sherwin
- Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Stanford University School of Medicine, Stanford, CA, USA
| | | | - Anna I Girsen
- Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Stanford University School of Medicine, Stanford, CA, USA
| | - Karl G Sylvester
- Division of Pediatric Surgery, Department of Surgery, Stanford University School of Medicine, Stanford, CA, USA
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23
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Zhang R, Zhang S, Wang Q. Trueness assessment of routine electrolytes measuring systems using the candidate reference method by ion chromatography. Scand J Clin Lab Invest 2021; 81:85-91. [PMID: 33570452 DOI: 10.1080/00365513.2020.1855469] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Electrolytes for sodium, potassium, magnesium, and calcium are important serum ions that are frequently assayed in clinical laboratories. In this study, we assessed the trueness of routine analytical systems for four cations using an inexpensive candidate reference method aimed to promote the standardization of serum electrolyte detection. An ion chromatography (IC) method with Cesium as an internal standard was developed and evaluated. The residual clinical serum samples at Chaoyang Hospital were collected and prepared into three human serum pools of electrolytes, which were used for the trueness evaluation of five routine analytical systems. Furthermore, the agreement between routine methods and the IC method was verified using 40 individual human samples. The recovery rates of sodium, potassium, magnesium and calcium were 99.69%, 100.34%, 100.43% and 99.89%, respectively. The intra-batch standard deviation and intra-laboratory precision of NIST SRM 956c were all less than 1% for the four ions. The certified values were within the validation range, and the deviation between the results and the certified values were less than 0.5%. The three serum pools were homogeneous and stable. All routine systems aligned with the IC method for four cations and achieved the analytical quality specifications for potassium and magnesium at 3 different concentrations. The developed IC method is simple, practical, accurate, and precise, which can be used as a candidate reference method for serum electrolytes measurement. Five routine analytical systems for electrolytes measurement had the acceptable bias for potassium and magnesium and their results showed good concordance.
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Affiliation(s)
- Rui Zhang
- Department of Clinical Laboratory, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, People's Republic of China
| | - Shunli Zhang
- Department of Clinical Laboratory, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, People's Republic of China
| | - Qingtao Wang
- Department of Clinical Laboratory, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, People's Republic of China.,Beijing Center for Clinical Laboratories, Beijing, People's Republic of China
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24
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Abstract
Thermal analysis and calorimetry share a close relationship in the field of thermal research. With regards to the specific heat capacity, researchers have been able to realize absolute measurement techniques by utilizing drop, conduction, and adiabatic methods that are used in calorimetry. Furthermore, it is possible to optimize differential scanning calorimetry, which is a comparative measurement technique for the specific heat capacity used in thermal analysis, by improving the absolute measurement techniques. At the National Metrology Institute of Japan (NMIJ), we developed a new certified reference material (CRM) for comparatively measuring the specific heat capacity, the single-crystalline silicon-NMIJ CRM 5806a, using a new type of cryogenic adiabatic calorimeter equipped with a pulse-tube refrigerator working in the temperature range from 50 to 350 K. This CRM was produced in accordance with the quality specifications of NMIJ, and complies with the ISO/IEC 17025, ISO 17034, and ISO GUIDE 35 standards. This paper reports on the procedure for fabricating this CRM and using it to perform specific heat capacity measurements at low temperatures. The specific heat capacity was measured using a differential scanning calorimeter in the temperature range from 280 to 340 K. NMIJ CRM 5806a was used to calibrate the heat flow. It was found that the uncertainty evaluation became easier because one factor of the uncertainty evaluation could be removed using the CRM. We show that the development of the CRM using the adiabatic calorimeter has led to an improvement in the specific heat capacity measurement results obtained by the differential scanning calorimeter.
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Affiliation(s)
- Haruka Abe
- Research Institute for Material and Chemical Measurement, National Metrology Institute of Japan, AIST, Central 3, 1-1-1 Umezono, Tsukuba, Ibaraki, 305-8563, Japan.
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25
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Ramaye Y, Dabrio M, Roebben G, Kestens V. Development and Validation of Optical Methods for Zeta Potential Determination of Silica and Polystyrene Particles in Aqueous Suspensions. Materials (Basel) 2021; 14:ma14020290. [PMID: 33429974 PMCID: PMC7827561 DOI: 10.3390/ma14020290] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Revised: 12/28/2020] [Accepted: 01/05/2021] [Indexed: 12/19/2022]
Abstract
Zeta potential is frequently used to examine the colloidal stability of particles and macromolecules in liquids. Recently, it has been suggested that zeta potential can also play an important role for grouping and read-across of nanoforms in a regulatory context. Although the measurement of zeta potential is well established, only little information is reported on key metrological principles such as validation and measurement uncertainties. This contribution presents the results of an in-house validation of the commonly used electrophoretic light scattering (ELS) and the relatively new particle tracking analysis (PTA) methods. The performance characteristics were assessed by analyzing silica and polystyrene reference materials. The ELS and PTA methods are robust and have particle mass working ranges of 0.003 mg/kg to 30 g/kg and 0.03 mg/kg to 1.5 mg/kg, respectively. Despite different measurement principles, both methods exhibit similar uncertainties for repeatability (2%), intermediate precision (3%) and trueness (4%). These results confirm that the developed methods can accurately measure the zeta potential of silica and polystyrene particles and can be transferred to other laboratories that analyze similar types of samples. If direct implementation is impossible, the elaborated methodologies may serve as a guide to help laboratories validating their own methods.
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26
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Prax M, Spindler-Raffel E, McDonald CP, Bearne J, Satake M, Kozakai M, Rojo J, Hanschmann KMO, Lambrecht B, Grundmann U, O'Flaherty N, Klimek A, Bekeredjian-Ding I, Gathof BS, Störmer M, Süßner S, Renke C, Lee CK, Knabbe C, Vollmer T, Keil SD, Shipps ME, Wagner SJ, Jentsch U, Mpumlwana X, Cloutier M, Bringmann P, Lu T, Ramirez-Arcos S, Kou Y, Krut O. Establishment of transfusion-relevant bacteria reference strains for red blood cells. Vox Sang 2020; 116:692-701. [PMID: 33341965 DOI: 10.1111/vox.13057] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 11/27/2020] [Accepted: 11/30/2020] [Indexed: 11/30/2022]
Abstract
BACKGROUND AND OBJECTIVES Red blood cell concentrates (RBCC) are susceptible to bacterial contamination despite cold storage. A reliable evaluation of strategies to minimize the risk of RBCC-associated bacterial transmission requires the use of suitable reference bacteria. Already existing Transfusion-Relevant Bacteria Reference Strains (TRBRS) for platelet concentrates fail to grow in RBCC. Consequently, the ISBT TTID, Working Party, Bacterial Subgroup, conducted an international study on TRBRS for RBCC. MATERIALS AND METHODS Six bacterial strains (Listeria monocytogenes PEI-A-199, Serratia liquefaciens PEI-A-184, Serratia marcescens PEI-B-P-56, Pseudomonas fluorescens PEI-B-P-77, Yersinia enterocolitica PEI-A-105, Yersinia enterocolitica PEI-A-176) were distributed to 15 laboratories worldwide for enumeration, identification, and determination of growth kinetics in RBCC at days 7, 14, 21, 28, 35 and 42 of storage after low-count spiking (10-25 CFU/RBCC). RESULTS Bacterial proliferation in RBCC was obtained for most strains, except for S. marcescens, which grew only at 4 of 15 laboratories. S. liquefaciens, S. marcescens, P. fluorescens and the two Y. enterocolitica strains reached the stationary phase between days 14 and 21 of RBCC storage with a bacterial concentration of approximately 109 CFU/ml. L. monocytogenes displayed slower growth kinetics reaching 106 -107 CFU/ml after 42 days. CONCLUSION The results illustrate the importance of conducting comprehensive studies to establish well-characterized reference strains, which can be a tool to assess strategies and methods used to ameliorate blood safety. The WHO Expert Committee on Biological Standardization adopted the five successful strains as official RBCC reference strains. Our study also highlights the relevance of visual inspection to interdict contaminated RBC units.
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Affiliation(s)
| | - Eva Spindler-Raffel
- Institut für Lebensmittelsicherheit/Food Safety, Hochschule, Geisenheim University, Geisenheim, Germany
| | | | | | | | | | - Julieta Rojo
- Centro Nacional de la Transfusión Sanguínea, Mexico, Mexico
| | | | | | - Udo Grundmann
- German Red Cross Blood Service NSTOB, Springe, Germany
| | | | - Agata Klimek
- Irish Blood Transfusion Service, Dublin, Ireland
| | | | - Birgit S Gathof
- Department of Transfusion Medicine, University Hospital of Cologne, Cologne, Germany
| | - Melanie Störmer
- Department of Transfusion Medicine, University Hospital of Cologne, Cologne, Germany
| | - Susanne Süßner
- Red Cross Transfusion Service of Upper Austria, Austrian Red Cross, Linz, Austria
| | - Claudia Renke
- Red Cross Transfusion Service of Upper Austria, Austrian Red Cross, Linz, Austria
| | - Cheuk-Kwong Lee
- Hong Kong Red Cross Blood Transfusion Service, Hong Kong, China
| | - Cornelius Knabbe
- Institut für Laboratoriums- und Transfusionsmedizin, Herz- und Diabeteszentrum NRW, Universitätsklinik der Ruhr-Universität Bochum, Bad Oeynhausen, Germany
| | - Tanja Vollmer
- Institut für Laboratoriums- und Transfusionsmedizin, Herz- und Diabeteszentrum NRW, Universitätsklinik der Ruhr-Universität Bochum, Bad Oeynhausen, Germany
| | | | | | - Stephen J Wagner
- Holland Laboratory, Transfusion Innovation Department, American Red Cross, Rockville, MD, USA
| | - Ute Jentsch
- Constantia Kloof, South African National Blood Service, Johannesburg, South Africa
| | - Xoliswa Mpumlwana
- Constantia Kloof, South African National Blood Service, Johannesburg, South Africa
| | | | | | - Thea Lu
- Cerus Corporation, Concord, CA, USA
| | - Sandra Ramirez-Arcos
- Canadian Blood Service, Ottawa, ON, Canada.,Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, ON, Canada
| | | | - Oleg Krut
- Paul-Ehrlich-Institut, Langen, Germany
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Kumagai K, Kurokawa A. Development of NMIJ CRM 5207-a tungsten dot-array for the image sharpness evaluation in scanning electron microscopy - structure evaluation and determination of dot-pitch. Microscopy (Oxf) 2020; 69:360-370. [PMID: 32510126 DOI: 10.1093/jmicro/dfaa030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 06/04/2020] [Accepted: 06/04/2020] [Indexed: 11/13/2022] Open
Abstract
We have developed a new certified reference material (CRM) for image sharpness evaluation and magnification calibration for scanning electron microscopy (SEM). Designed to be suitable for the image sharpness evaluation by the derivative method, the CRM has nanoscale tungsten dot-array structure fabricated on silicon substrate, which gives steep contrast transition from the dot to the substrate in SEM image. The pitch of the dot-array was SI-traceably measured as a specified value with relative expanded uncertainty ($k=2$) of ~1.3%, which can be utilized for the magnification calibration of SEM. Since specimens, as one of the image formation parameters, easily affect image sharpness value, our CRM, as a 'pinned specimen', will play an important role to achieve robust and stable image sharpness measurement system.
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Affiliation(s)
- Kazuhiro Kumagai
- Research Institute for Material and Chemical Measurement, National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, 1-1-1 Higashi, Tsukuba 305-8565 Japan
| | - Akira Kurokawa
- Research Institute for Material and Chemical Measurement, National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, 1-1-1 Higashi, Tsukuba 305-8565 Japan
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28
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Huang X, Ma K, Leinonen S, Sontag-Strohm T. Barley C-Hordein as the Calibrant for Wheat Gluten Quantification. Foods 2020; 9:foods9111637. [PMID: 33182660 PMCID: PMC7697280 DOI: 10.3390/foods9111637] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 11/05/2020] [Accepted: 11/05/2020] [Indexed: 01/03/2023] Open
Abstract
The lack of certified reference materials has been one major challenge for gluten quantification in gluten-free products. In this study, the feasibility of using barley C-hordein as the calibrant for wheat gluten in R5 sandwich enzyme-linked immunosorbent assay (ELISA) was investigated. The gluten composition and total gluten R5 reactivity ranged largely depending on the genotypes and the growing environment. The conversion factor of gliadin to gluten averaged 1.31 for common wheat, which is smaller than the theoretical factor of 2. Each gluten group had varying reactivity against the R5 antibody, where ω1.2-, γ- and α-gliadins were the main reactive groups from wheat gluten. A mixture of wheat cultivars or one single cultivar as the reference material can be difficult to keep current. Based on the average R5 reactivity of total gluten from the 27 common wheat cultivars, here we proposed 10% C-hordein mixed with an inert protein as the calibrant for wheat gluten quantification. In spiking tests of gluten-free oat flour and biscuits, calibration using 10% C-hordein achieved the same recovery as the gliadin standard with its cultivar-specific conversion factor. For its good solubility and good affinity to the R5 antibody, the application of C-hordein increases the probability of developing a series of reference materials for various food matrices.
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29
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Xie J, Liu B, Zhao Z, Zhang L, Yang D, Zhao Y. [Application of isotope dilution-liquid chromatography-tandem mass spectrometry in the preparation and certification of reference material of tenuazonic acid and tentoxin in wheat flour]. Se Pu 2020; 38:833-840. [PMID: 34213291 DOI: 10.3724/sp.j.1123.2019.12005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023] Open
Abstract
A method for the preparation and certification of the reference material of tenuazonic acid (TeA) and tentoxin (TEN) in wheat flour was developed. This method provided methodological references to develop of standard material for analyzing alternaria toxins in grains. The wheat flour reference materials were based on wheat grains which were naturally contaminated with alternaria toxins. The certified values for TeA and TEN were determined by isotope dilution-liquid chromatography-tandem mass spectrometry (ID-LC-MS/MS) and cooperated certification of multiple laboratories. The wheat flour reference materials were stored at room temperature, protected from light and characterized by low uncertainty. The wheat flour reference materials are currently the only wheat flour reference materials that naturally contaminate TeA and TEN, and it can be used in the evaluating related analytical methods involved in food safety risk monitoring, product quality testing and quality control measurements.
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Affiliation(s)
- Ji'an Xie
- Anhui Provincial Center for Disease Control and Prevention, Hefei 230601, China
| | - Bolin Liu
- Anhui Provincial Center for Disease Control and Prevention, Hefei 230601, China
| | - Ziwei Zhao
- Anhui Provincial Center for Disease Control and Prevention, Hefei 230601, China
| | - Lei Zhang
- China National Center for Food Safety Risk Assessment, Beijing 100050, China
| | - Dajin Yang
- China National Center for Food Safety Risk Assessment, Beijing 100050, China
| | - Yunfeng Zhao
- China National Center for Food Safety Risk Assessment, Beijing 100050, China
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30
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Schall E, Scherf KA, Bugyi Z, Török K, Koehler P, Schoenlechner R, Tömösközi S. Further Steps Toward the Development of Gluten Reference Materials - Wheat Flours or Protein Isolates? Front Plant Sci 2020; 11:906. [PMID: 32733501 PMCID: PMC7359866 DOI: 10.3389/fpls.2020.00906] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Accepted: 06/03/2020] [Indexed: 06/11/2023]
Abstract
Celiac disease is a gluten-induced hypersensitivity reaction that requires a lifelong gluten-free diet. Gluten-free foods must not contain more than 20 mg/kg gluten as laid down by Codex Alimentarius. Measuring the presence of gluten with routine immunoanalytical methods in food is a serious challenge as many factors affect accurate determination. Comparability of the results obtained with different methods and method validation are hindered by the lack of a widely accepted reference material (RM). The core questions of RM development from wheat are the number of cultivars to be included and the format of gluten (i.e., flour, gluten, or gliadin isolates) to be applied. Therefore, the aim of our work was to produce an appropriate gluten RM from wheat. For this, five previously selected wheat cultivars and their blend were used to produce flours, gluten and gliadin isolates under laboratory conditions. Protein content, protein composition and responses to different ELISA methods were compared and widely evaluated in our study. The protein contents of the flours were 12.1-18.7%, those of the gluten isolates 93.8-97.4% and those of the gliadin isolates 72.7-101.9%. The gluten and gliadin isolates had similar protein profiles as the source flours. By comparing the different wheat cultivars and their protein isolates, we found that the isolation had a smaller effect on protein composition than genetic variability. The choice of a blend would be more suitable for the production of a RM in case of flours and also isolates. The immunoanalytical results showed that the isolation had an effect on the analytical results, but its extent depended on the ELISA method. The use of flour would be more applicable in this regard, but handling of the material and long-term stability should also be considered in the final decision of gluten RM production.
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Affiliation(s)
- Eszter Schall
- Research Group of Cereal Science and Food Quality, Department of Applied Biotechnology and Food Science, Budapest University of Technology and Economics, Budapest, Hungary
| | - Katharina A. Scherf
- Leibniz-Institute for Food Systems Biology at the Technical University of Munich, Freising, Germany
- Department of Bioactive and Functional Food Chemistry, Institute of Applied Biosciences, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
| | - Zsuzsanna Bugyi
- Research Group of Cereal Science and Food Quality, Department of Applied Biotechnology and Food Science, Budapest University of Technology and Economics, Budapest, Hungary
| | - Kitti Török
- Research Group of Cereal Science and Food Quality, Department of Applied Biotechnology and Food Science, Budapest University of Technology and Economics, Budapest, Hungary
| | | | - Regine Schoenlechner
- Department of Food Science and Technology, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Sándor Tömösközi
- Research Group of Cereal Science and Food Quality, Department of Applied Biotechnology and Food Science, Budapest University of Technology and Economics, Budapest, Hungary
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31
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Weber S, Spiegl B, Perakis SO, Ulz CM, Abuja PM, Kashofer K, van der Leest P, Azpurua MA, Tamminga M, Brudzewsky D, Rothwell DG, Mohan S, Sartori A, Lampignano R, Konigshofer Y, Sprenger-Haussels M, Wikman H, Bergheim IR, Kloten V, Schuuring E, Speicher MR, Heitzer E. Technical Evaluation of Commercial Mutation Analysis Platforms and Reference Materials for Liquid Biopsy Profiling. Cancers (Basel) 2020; 12:E1588. [PMID: 32560092 PMCID: PMC7352370 DOI: 10.3390/cancers12061588] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 05/15/2020] [Accepted: 06/11/2020] [Indexed: 02/06/2023] Open
Abstract
Molecular profiling from liquid biopsy, in particular cell-free DNA (cfDNA), represents an attractive alternative to tissue biopsies for the detection of actionable targets and tumor monitoring. In addition to PCR-based assays, Next Generation Sequencing (NGS)-based cfDNA assays are now commercially available and are being increasingly adopted in clinical practice. However, the validity of these products as well as the clinical utility of cfDNA in the management of patients with cancer has yet to be proven. Within framework of the Innovative Medicines Initiative (IMI) program CANCER-ID we evaluated the use of commercially available reference materials designed for ctDNA testing and cfDNA derived from Diagnostic Leukaphereses (DLA) for inter- and intra-assay as well as intra- and inter-laboratory comparisons. In three experimental setups, a broad range of assays including ddPCR, MassARRAY and various NGS-based assays were tested. We demonstrate that both reference materials with predetermined VAFs and DLA samples are extremely useful for the performance assessment of mutation analysis platforms. Moreover, our data indicate a substantial variability of NGS assays with respect to sensitivity and specificity highlighting the importance of extensive validation of the test performance before offering these tests in clinical routine practice.
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Affiliation(s)
- Sabrina Weber
- Institute of Human Genetics, Diagnostic & Research Center for Molecular BioMedicine, Medical University of Graz, 8010 Graz, Austria; (S.W.); (B.S.); (S.O.P.); (M.R.S.)
- Christian Doppler Laboratory for Liquid Biopsies for Early Detection of Cancer, Medical University of Graz, 8010 Graz, Austria;
| | - Benjamin Spiegl
- Institute of Human Genetics, Diagnostic & Research Center for Molecular BioMedicine, Medical University of Graz, 8010 Graz, Austria; (S.W.); (B.S.); (S.O.P.); (M.R.S.)
| | - Samantha O. Perakis
- Institute of Human Genetics, Diagnostic & Research Center for Molecular BioMedicine, Medical University of Graz, 8010 Graz, Austria; (S.W.); (B.S.); (S.O.P.); (M.R.S.)
| | - Christine M. Ulz
- Institute of Pathology, Diagnostic & Research Center for Molecular BioMedicine, Medical University of Graz, 8010 Graz, Austria; (C.M.U.); (K.K.); (P.v.d.L.)
| | - Peter M. Abuja
- Christian Doppler Laboratory for Liquid Biopsies for Early Detection of Cancer, Medical University of Graz, 8010 Graz, Austria;
- Institute of Pathology, Diagnostic & Research Center for Molecular BioMedicine, Medical University of Graz, 8010 Graz, Austria; (C.M.U.); (K.K.); (P.v.d.L.)
| | - Karl Kashofer
- Institute of Pathology, Diagnostic & Research Center for Molecular BioMedicine, Medical University of Graz, 8010 Graz, Austria; (C.M.U.); (K.K.); (P.v.d.L.)
| | - Paul van der Leest
- Institute of Pathology, Diagnostic & Research Center for Molecular BioMedicine, Medical University of Graz, 8010 Graz, Austria; (C.M.U.); (K.K.); (P.v.d.L.)
| | - Maria Aguirre Azpurua
- University of Groningen, University Medical Center of Groningen, 9713 GZ Groningen, The Netherlands; (M.A.A.); (M.T.); (E.S.)
| | - Menno Tamminga
- University of Groningen, University Medical Center of Groningen, 9713 GZ Groningen, The Netherlands; (M.A.A.); (M.T.); (E.S.)
| | - Dan Brudzewsky
- LGC SeraCare Life Sciences, Milford, MA 01757, USA; (D.B.); (Y.K.)
| | - Dominic G. Rothwell
- Cancer Research UK MI, University of Manchester, Manchester SK10 4TG, UK; (D.G.R.); (S.M.)
| | - Sumitra Mohan
- Cancer Research UK MI, University of Manchester, Manchester SK10 4TG, UK; (D.G.R.); (S.M.)
| | | | - Rita Lampignano
- Bayer AG, Biomarker Research, 42113 Wuppertal, Germany; (R.L.); (V.K.)
| | - Yves Konigshofer
- LGC SeraCare Life Sciences, Milford, MA 01757, USA; (D.B.); (Y.K.)
| | | | - Harriet Wikman
- University Medical Center Hamburg-Eppendorf, 20251 Hamburg, Germany;
| | - Inger R. Bergheim
- Department of Cancer Genetics, Institute of Cancer Research, Oslo University Hospital, N-0310 Oslo, Norway;
| | - Vera Kloten
- Bayer AG, Biomarker Research, 42113 Wuppertal, Germany; (R.L.); (V.K.)
| | - Ed Schuuring
- University of Groningen, University Medical Center of Groningen, 9713 GZ Groningen, The Netherlands; (M.A.A.); (M.T.); (E.S.)
| | - Michael R. Speicher
- Institute of Human Genetics, Diagnostic & Research Center for Molecular BioMedicine, Medical University of Graz, 8010 Graz, Austria; (S.W.); (B.S.); (S.O.P.); (M.R.S.)
| | - Ellen Heitzer
- Institute of Human Genetics, Diagnostic & Research Center for Molecular BioMedicine, Medical University of Graz, 8010 Graz, Austria; (S.W.); (B.S.); (S.O.P.); (M.R.S.)
- Christian Doppler Laboratory for Liquid Biopsies for Early Detection of Cancer, Medical University of Graz, 8010 Graz, Austria;
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Abstract
The National Institute of Standards and Technology (NIST), formerly the National Bureau of Standards, was established by the US Congress in 1901 and charged with establishing a measurement foundation to facilitate US and international commerce. This broad language provides NIST with the ability to establish and implement its programs in response to changes in national needs and priorities. This review traces some of the changes in NIST's reference material programs over time and presents the NIST Material Measurement Laboratory's current approach to promoting accuracy and metrological traceability of chemical measurements and validation of chemical measurement processes.
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Affiliation(s)
- Steven J Choquette
- Office of Reference Materials, Materials Measurement Laboratory, National Institute of Standards and Technology (NIST), Gaithersburg, Maryland 20899-2300, USA
| | - David L Duewer
- Chemical Sciences Division, Materials Measurement Laboratory, National Institute of Standards and Technology (NIST), Gaithersburg, Maryland 20899-8390, USA;
| | - Katherine E Sharpless
- Special Programs Office, National Institute of Standards and Technology (NIST), Gaithersburg, Maryland 20899-4701, USA
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33
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Haraguchi K, Sakamoto M, Matsuyama A, Yamamoto M, Hung DT, Nagasaka H, Uchida K, Ito Y, Kodamatani H, Horvat M, Chan HM, Rand M, Cirtiu CM, Kim BG, Nielsen F, Yamakawa A, Mashyanov N, Panichev N, Panova E, Watanabe T, Kaneko N, Yoshinaga J, Herwati RF, Suoth AE, Akagi H. Development of Human Hair Reference Material Supporting the Biomonitoring of Methylmercury. ANAL SCI 2020; 36:561-567. [PMID: 32147632 DOI: 10.2116/analsci.19sbp07] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A certified reference material, NIMD-01, was developed for the analysis of mercury speciation in human hair. We collected the hair of Vietnamese males from a barbershop in Hanoi in 2016 and prepared 1200 bottles containing 3 g of sieved and blended hair powder. The certified value was given on a dry-mass basis, with the moisture content obtained by drying at 85°C for 4 h. Certified values with the expanded uncertainties (coverage factor, k = 2) were as follows: methylmercury, 0.634 ± 0.071 mg kg-1 as mercury; total mercury, 0.794 ± 0.050 mg kg-1; copper, 12.8 ± 1.4 mg kg-1; zinc, 234 ± 29 mg kg-1; selenium, 1.52 ± 0.29 mg kg-1. An indicative arsenic concentration of 0.17 ± 0.03 mg kg-1 was measured. Extended uncertainties were estimated by sample homogeneity, long- and short-term stabilities, and a characterization from measurements made by collaborating laboratories.
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Affiliation(s)
- Koichi Haraguchi
- Department of International Affairs and Research, National Institute for Minamata Disease
| | - Mineshi Sakamoto
- Department of Environment and Public Health, National Institute for Minamata Disease
| | - Akito Matsuyama
- Department of International Affairs and Research, National Institute for Minamata Disease
| | - Megumi Yamamoto
- Department of Environment and Public Health, National Institute for Minamata Disease
| | - Dang T Hung
- Laboratory Center, Hanoi University of Public Health
| | | | - Keisuke Uchida
- Institute of Environmental Ecology, IDEA Consultants, Inc
| | - Yasunori Ito
- Institute of Environmental Ecology, IDEA Consultants, Inc
| | | | - Milena Horvat
- Department of Environmental Sciences, Jozef Stefan Institute
| | | | - Matthew Rand
- Department of Environmental Medicine, University of Rochester School of Medicine and Dentistry
| | - Ciprian M Cirtiu
- Centre de Toxicologie du Quebec, Institut National de Santé Publique du Quebec
| | - Byoung-Gwon Kim
- Department of Preventive Medicine, College of Medicine, Dong-A University
| | | | - Akane Yamakawa
- Center for Environmental Measurement and Analysis, National Institute for Environmental Studies
| | | | | | - Elena Panova
- Institute of the Earth Sciences, St. Petersburg University
| | | | | | | | | | - Alfrida E Suoth
- Research and Development for Environmental Quality and Laboratory Center, MOEF
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34
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Monogioudi E, Sheldon J, Meroni PL, Hutu DP, Schimmel H, Zegers I. Certified reference material against PR3 ANCA IgG autoantibodies. From development to certification. Clin Chem Lab Med 2020; 57:1197-1206. [PMID: 30789822 DOI: 10.1515/cclm-2018-1095] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Accepted: 01/08/2019] [Indexed: 11/15/2022]
Abstract
Background The importance of the standardisation of immunoassays for autoantibodies has been widely discussed. The appropriate use of certified reference materials (CRM) could contribute to a more accurate diagnosis and follow-up of a series of diseases such as small vessel-associated vasculitis. This is a systemic autoimmune disorder during which two autoantibodies can be present, MPO ANCA IgG and PR3 ANCA IgG. Results from different commercially available immunoassays used for PR3 ANCA IgG measurement can vary significantly. Therefore the potential for improvement using a suitable certified reference material was assessed and led to the development of a CRM. Methods Thirty clinical samples were evaluated using 10 immunoassays. The correlation between results from these assays was assessed in a pairwise manner. Feasibility studies were conducted in order to find a reference material format most suitable for the preparation of a CRM. Results The evaluation of two sets of 30 clinical samples with 10 assays showed that differences between assays can result in different interpretations for individual clinical samples. Most of the samples had the same result classification in all assays. However, six of the samples tested led to inconsistent results. Conclusions The correlation between results from clinical samples was systematically good for combinations of eight of those assays. Therefore, it should be possible to improve the comparability of results using a commutable CRM for calibration. Based on these studies, a final format for the CRM was selected and eventually produced and certified for its PR3 ANCA IgG content.
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Affiliation(s)
- Evanthia Monogioudi
- European Commission, Joint Research Centre, Retieseweg 111, 2440 Geel, Belgium, Phone: +32 14 571 906, Fax: +32 14 571 548
| | - Joanna Sheldon
- Protein Reference Unit and Immunopathology Department, St Georges' Hospital, London, UK
| | - Pier Luigi Meroni
- Istituto G. Pini, University of Milan, Department of Clinical Sciences and Community Health and Istituto Auxologico Italiano, Milan, Italy
| | | | - Heinz Schimmel
- European Commission, Joint Research Centre, Geel, Belgium
| | - Ingrid Zegers
- European Commission, Joint Research Centre, Geel, Belgium
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He HJ, Das B, Cleveland MH, Chen L, Camalier CE, Liu LC, Norman KL, Fellowes AP, McEvoy CR, Lund SP, Almeida J, Steffen CR, Karlovich C, Williams PM, Cole KD. Development and interlaboratory evaluation of a NIST Reference Material RM 8366 for EGFR and MET gene copy number measurements. Clin Chem Lab Med 2020; 57:1142-1152. [PMID: 31112502 PMCID: PMC6875440 DOI: 10.1515/cclm-2018-1306] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Accepted: 02/21/2019] [Indexed: 01/04/2023]
Abstract
Background The National Institute of Standards and Technology (NIST) Reference Material RM 8366 was developed to improve the quality of gene copy measurements of EGFR (epidermal growth factor receptor) and MET (proto-oncogene, receptor tyrosine kinase), important targets for cancer diagnostics and treatment. The reference material is composed of genomic DNA prepared from six human cancer cell lines with different levels of amplification of the target genes. Methods The reference values for the ratios of the EGFR and MET gene copy numbers to the copy numbers of reference genes were measured using digital PCR. The digital PCR measurements were confirmed by two additional laboratories. The samples were also characterized using Next Generation Sequencing (NGS) methods including whole genome sequencing (WGS) at three levels of coverage (approximately 1 ×, 5 × and greater than 30 ×), whole exome sequencing (WES), and two different pan-cancer gene panels. The WES data were analyzed using three different bioinformatic algorithms. Results The certified values (digital PCR) for EGFR and MET were in good agreement (within 20%) with the values obtained from the different NGS methods and algorithms for five of the six components; one component had lower NGS values. Conclusions This study shows that NIST RM 8366 is a valuable reference material to evaluate the performance of assays that assess EGFR and MET gene copy number measurements.
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Affiliation(s)
- Hua-Jun He
- Biosystems and Biomaterials Division, National Institute of Standards and Technology, 100 Bureau Drive, MS 8312, Gaithersburg, MD 20899, USA, Phone: +301-975-2169, Fax: +301-330-3447
| | - Biswajit Das
- Molecular Characterization and Clinical Assay Development Laboratory, Frederick National Laboratory for Cancer Research, Frederick, MD, USA
| | - Megan H Cleveland
- Biomolecular Measurement Division, National Institute of Standards and Technology, Gaithersburg, MD, USA
| | - Li Chen
- Molecular Characterization and Clinical Assay Development Laboratory, Frederick National Laboratory for Cancer Research, Frederick, MD, USA
| | - Corinne E Camalier
- Molecular Characterization and Clinical Assay Development Laboratory, Frederick National Laboratory for Cancer Research, Frederick, MD, USA
| | | | | | | | | | - Steve P Lund
- Statistical Engineering Division, National Institute of Standards and Technology, Gaithersburg, MD, USA
| | - Jamie Almeida
- Biosystems and Biomaterials Division, National Institute of Standards and Technology, Gaithersburg, MD, USA
| | - Carolyn R Steffen
- Biomolecular Measurement Division, National Institute of Standards and Technology, Gaithersburg, MD, USA
| | - Chris Karlovich
- Molecular Characterization and Clinical Assay Development Laboratory, Frederick National Laboratory for Cancer Research, Frederick, MD, USA
| | - P Mickey Williams
- Molecular Characterization and Clinical Assay Development Laboratory, Frederick National Laboratory for Cancer Research, Frederick, MD, USA
| | - Kenneth D Cole
- Biosystems and Biomaterials Division, National Institute of Standards and Technology, 100 Bureau Drive, MS 8312, Gaithersburg, MD 20899, USA, Phone: +301-975-2169, Fax: +301-330-3447
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36
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von der Esch E, Lanzinger M, Kohles AJ, Schwaferts C, Weisser J, Hofmann T, Glas K, Elsner M, Ivleva NP. Simple Generation of Suspensible Secondary Microplastic Reference Particles via Ultrasound Treatment. Front Chem 2020; 8:169. [PMID: 32257996 PMCID: PMC7093332 DOI: 10.3389/fchem.2020.00169] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Accepted: 02/25/2020] [Indexed: 11/16/2022] Open
Abstract
In the environment the weathering of plastic debris is one of the main sources of secondary microplastic (MP). It is distinct from primary MP, as it is not intentionally engineered, and presents a highly heterogeneous analyte composed of plastic fragments in the size range of 1 μm-1 mm. To detect secondary MP, methods must be developed with appropriate reference materials. These should share the characteristics of environmental MP which are a broad size range, multitude of shapes (fragments, spheres, films, fibers), suspensibility in water, and modified particle surfaces through aging (additional OH, C=O, and COOH). To produce such a material, we bring forward a rapid sonication-based fragmentation method for polystyrene (PS), polyethylene terephthalate (PET), and polylactic acid (PLA), which yields up to 105/15 mL dispersible, high purity MP particles in aqueous media. To satisfy the claim of a reference material, the key properties-composition and size distribution to ensure the homogeneity of the samples, as well as shape, suspensibility, and aging -were analyzed in replicates (N = 3) to ensure a robust production procedure. The procedure yields fragments in the range of 100 nm-1 mm (<20 μm, 54.5 ± 11.3% of all particles). Fragments in the size range 10 μm-1 mm were quantitatively characterized via Raman microspectroscopy (particles = 500-1,000) and reflectance micro Fourier transform infrared analysis (particles = 10). Smaller particles 100 nm-20 μm were qualitatively characterized by scanning electron microcopy (SEM). The optical microscopy and SEM analysis showed that fragments are the predominant shape for all polymers, but fibers are also present. Furthermore, the suspensibility and sedimentation in pure MilliQ water was investigated using ultraviolet-visible spectroscopy and revealed that the produced fragments sediment according to their density and that the attachment to glass is avoided. Finally, a comparison of the infrared spectra from the fragments produced through sonication and naturally aged MP shows the addition of polar groups to the surface of the particles in the OH, C=O, and COOH region, making these particles suitable reference materials for secondary MP.
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Affiliation(s)
- Elisabeth von der Esch
- Institute of Hydrochemistry, Chair of Analytical Chemistry and Water Chemistry, Technical University of Munich, Munich, Germany
| | - Maria Lanzinger
- Institute of Hydrochemistry, Chair of Analytical Chemistry and Water Chemistry, Technical University of Munich, Munich, Germany
| | - Alexander J. Kohles
- Institute of Hydrochemistry, Chair of Analytical Chemistry and Water Chemistry, Technical University of Munich, Munich, Germany
| | - Christian Schwaferts
- Institute of Hydrochemistry, Chair of Analytical Chemistry and Water Chemistry, Technical University of Munich, Munich, Germany
| | - Jana Weisser
- Chair of Food Chemistry and Molecular Sensory Science, Technical University of Munich, Freising, Germany
| | - Thomas Hofmann
- Chair of Food Chemistry and Molecular Sensory Science, Technical University of Munich, Freising, Germany
| | - Karl Glas
- Chair of Food Chemistry and Molecular Sensory Science, Technical University of Munich, Freising, Germany
| | - Martin Elsner
- Institute of Hydrochemistry, Chair of Analytical Chemistry and Water Chemistry, Technical University of Munich, Munich, Germany
| | - Natalia P. Ivleva
- Institute of Hydrochemistry, Chair of Analytical Chemistry and Water Chemistry, Technical University of Munich, Munich, Germany
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Hudgens JW. Construction of a Dual Protease Column, Subzero (-30 °C) Chromatography System and Multi-channel Precision Temperature Controller for Hydrogen-Deuterium Exchange Mass Spectrometry. J Res Natl Inst Stand Technol 2020; vol:jres.vol.125.025. [PMID: 35573859 PMCID: PMC9097885 DOI: 10.6028/jres.125.025] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 07/31/2020] [Indexed: 05/12/2023]
Abstract
This tutorial provides mechanical drawings, electrical schematics, parts lists, stereolithography (STL) files for producing three-dimensional (3D)-printed parts, initial graphics exchange specification (IGS) files for automated machining, and instructions necessary for construction of a dual protease column, subzero, liquid chromatography system for hydrogen-deuterium exchange mass spectrometry (HDX-MS). Electro-mechanical schematics for construction of two multi-zone temperature controllers that regulate to ±0.05 oC are also included in this tutorial.
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Affiliation(s)
- Jeffrey W. Hudgens
- National Institute of Standards and Technology, Bioprocess Measurement Group, Biomolecular Measurement Division, Gaithersburg, MD 20899,
USA
- Institute for Bioscience and Biotechnology Research, 9600 Gudelsky Drive, Rockville, MD 20850,
USA
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38
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Even M, Hutzler C, Wilke O, Luch A. Emissions of volatile organic compounds from polymer-based consumer products: Comparison of three emission chamber sizes. Indoor Air 2020; 30:40-48. [PMID: 31544292 DOI: 10.1111/ina.12605] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 08/12/2019] [Accepted: 09/18/2019] [Indexed: 05/06/2023]
Abstract
The ISO 16000 standard series provide guidelines for emission measurements of volatile organic compounds (VOCs) from building materials. However, polymer-based consumer products such as toys may also release harmful substances into indoor air. In such cases, the existing standard procedures are unsuitable for official control laboratories due to high costs for large emission testing chambers. This paper aims at developing and comparing alternative and more competitive methods for the emission testing of consumer products. The influence of the emission chamber size was investigated as smaller chambers are more suited to the common size of consumer products and may help to reduce the costs of testing. Comparison of the performance of a 203 L emission test chamber with two smaller chambers with the capacity of 24 L and 44 mL, respectively, was carried out by using a polyurethane reference material spiked with 14 VOCs during the course of 28 days. The area-specific emission rates obtained in the small chambers were always similar to those of the 203 L reference chamber after a few hours. This implies that smaller chambers can provide at least useful numbers on the extent of polymer-based consumer product emissions into indoor air, thereby supporting meaningful exposure assessments.
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Affiliation(s)
- Morgane Even
- Department of Chemical and Product Safety, German Federal Institute for Risk Assessment (BfR), Berlin, Germany
| | - Christoph Hutzler
- Department of Chemical and Product Safety, German Federal Institute for Risk Assessment (BfR), Berlin, Germany
| | - Olaf Wilke
- Division 4.2 - Materials and Air Pollutants, Federal Institute for Materials Research and Testing (BAM), Berlin, Germany
| | - Andreas Luch
- Department of Chemical and Product Safety, German Federal Institute for Risk Assessment (BfR), Berlin, Germany
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Abstract
We developed a reference material (RM) for the determination of hexavalent chromium (Cr(VI)) in tap water. The tap water RM was prepared by adding a Cr(VI) standard solution to the raw material without acidification, i.e., under the original pH conditions of 7.6, because the decrease in the concentration of Cr(VI) was observed when the tap water had been adjusted to pH 1 with HNO3. The prepared tap-water RM (2 L) was packed in 10 fluororesin (PFA) bottles with an inside plug (200 mL each). Each PFA bottle (Cr(VI)-containing tap water) was sealed in a reclosable poly bag and then stored at 5°C in a refrigerator. The tap water RM had a Cr(VI) concentration of 51 μg L-1. The concentration of Cr(VI) was determined by diphenylcarbazide absorptiometry using a 100-mm quartz cell. The detection limit of Cr(VI) in the sample solution corresponding to three-times the standard deviation (n = 5) of blank values was 0.51 μg L-1. The homogeneity of Cr(VI) in the tap water RM was evaluated by an analysis of the variance after the Cochran test. There was no significant difference between the within-bottle and between-bottle variances of the analytical results, indicating that the tap water RM was sufficiently homogeneous. The stability of Cr(VI) in the tap water RM was investigated by monitoring the Cr(VI) concentration over a period of 6 months. The slope of the regression line of the Cr(VI) concentration versus the storage time did not significantly differ from zero, indicating that the tap water RM was stable for 6 months. The concentrations (50 - 51 μg L-1) of Cr(VI) in the tap water RM were in good agreement with the total chromium concentrations (50 - 51 μg L-1) obtained by atomic absorption spectrometry.
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Affiliation(s)
- Tetsuo Inui
- Analytical Chemistry Group, Chemical Engineering Department, Kanagawa Institute of Industrial Science and Technology
| | - Hamana Shirota
- Analytical Chemistry Group, Chemical Engineering Department, Kanagawa Institute of Industrial Science and Technology
| | - Shoji Sakao
- Analytical Chemistry Group, Chemical Engineering Department, Kanagawa Institute of Industrial Science and Technology
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Takahashi K, Takano A, Kinugasa S, Sakurai H. Determination of the Rayleigh Ratio with an Uncertainty Analysis by Static Light-Scattering Measurements of Certified Reference Materials for Molecular Weight. ANAL SCI 2019; 35:1045-1051. [PMID: 31178550 DOI: 10.2116/analsci.19p103] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The most important parameter for light-scattering measurements in the Rayleigh scattering region is the Rayleigh ratio, which is necessary to obtain the absolute scattered light intensity from the relative scattered light intensity. The absolute scattered light intensity is directly related to the molar masses of polymers, colloids, biomolecules, and the like. A new Rayleigh ratio was determined by measuring static light scattering from certified reference materials with highly accurate certified values of the molecular weight determined by several other techniques, such as MALDI-TOF mass spectrometry or size-exclusion chromatography. The new Rayleigh ratio can be used for evaluating the uncertainty of the molecular weight of polymers and macromolecules, as measured by light scattering.
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Affiliation(s)
- Kayori Takahashi
- National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST)
| | | | - Shinichi Kinugasa
- National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST)
| | - Hiromu Sakurai
- National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST)
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41
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Hudgens JW, Gallagher ES, Karageorgos I, Anderson KW, Huang RYC, Chen G, Bou-Assaf GM, Espada A, Chalmers MJ, Harguindey E, Zhang HM, Walters BT, Zhang J, Venable J, Steckler C, Park I, Brock A, Lu X, Pandey R, Chandramohan A, Anand GS, Nirudodhi SN, Sperry JB, Rouse JC, Carroll JA, Rand KD, Leurs U, Weis DD, Al-Naqshabandi MA, Hageman TS, Deredge D, Wintrode PL, Papanastasiou M, Lambris JD, Li S, Urata S. Hydrogen-Deuterium Exchange Mass Spectrometry (HDX-MS) Centroid Data Measured between 3.6 °C and 25.4 °C for the Fab Fragment of NISTmAb. J Res Natl Inst Stand Technol 2019; 124:1-7. [PMID: 34877153 PMCID: PMC7339623 DOI: 10.6028/jres.124.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 04/10/2019] [Indexed: 06/13/2023]
Abstract
The spreadsheet file reported herein provides centroid data, descriptive of
deuterium uptake, for the FabFragment of NISTmAb (PDB: 5K8A) reference material, as
measured by the bottom-up hydrogen-deuterium exchange mass spectrometry (HDX-MS)
method. The protein sample was incubated in deuterium-rich solutions under uniform
pH and salt concentrations between 3.6 oC and 25.4 oC for seven intervals ranging
over (0 to 14,400) s plus a ∞pseudo s control. The deuterium content of peptic
peptide fragments were measured by mass spectrometry. These data were reported by
fifteen laboratories, which conducted the measurements using orbitrap and Q-TOF mass
spectrometers. The cohort reported ≈ 78,900 centroids for 430 proteolytic peptide
sequences of the heavy and light chains of NISTmAb, providing nearly 100 % coverage.
In addition, some groups reported ≈ 10,900 centroid measurements for 77 peptide
sequences of the Fc fragment. The instrumentation and physical and chemical
conditions under which these data were acquired are documented.
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Affiliation(s)
- Jeffrey W Hudgens
- National Institute of Standards and Technology, Bioprocess Measurement Group, Biomolecular Measurements Division, Gaithersburg, MD 20899, USA
- Institute for Bioscience and Biotechnology Research, 9600 Gudelsky Drive, Rockville, MD 20850, USA
| | - Elyssia S Gallagher
- National Institute of Standards and Technology, Bioprocess Measurement Group, Biomolecular Measurements Division, Gaithersburg, MD 20899, USA
- Institute for Bioscience and Biotechnology Research, 9600 Gudelsky Drive, Rockville, MD 20850, USA
| | - Ioannis Karageorgos
- National Institute of Standards and Technology, Bioprocess Measurement Group, Biomolecular Measurements Division, Gaithersburg, MD 20899, USA
- Institute for Bioscience and Biotechnology Research, 9600 Gudelsky Drive, Rockville, MD 20850, USA
| | - Kyle W Anderson
- National Institute of Standards and Technology, Bioprocess Measurement Group, Biomolecular Measurements Division, Gaithersburg, MD 20899, USA
- Institute for Bioscience and Biotechnology Research, 9600 Gudelsky Drive, Rockville, MD 20850, USA
| | - Richard Y-C Huang
- Bristol-Myers Squibb Company, Pharmaceutical Candidate Optimization, Research and Development, Princeton, NJ 08540, USA
| | - Guodong Chen
- Bristol-Myers Squibb Company, Pharmaceutical Candidate Optimization, Research and Development, Princeton, NJ 08540, USA
| | - George M Bou-Assaf
- Biogen Inc., Analytical Development, 225 Binney Street, Cambridge, MA 02142, USA
| | - Alfonso Espada
- Centro de Investigación Lilly S.A., 28108-Alcobendas, Spain
| | - Michael J Chalmers
- Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, IN 46285, USA
| | | | - Hui-Min Zhang
- Genentech, Inc. Protein Analytical Chemistry, 1 DNA Way, South San Francisco, CA 94080, USA
| | - Benjamin T Walters
- Genentech, Inc. Protein Analytical Chemistry, 1 DNA Way, South San Francisco, CA 94080, USA
| | - Jennifer Zhang
- Genentech, Inc. Protein Analytical Chemistry, 1 DNA Way, South San Francisco, CA 94080, USA
| | - John Venable
- Genomics Institute of the Novartis Research Foundation, 10675 John Jay Hopkins Drive, San Diego, CA 92121, USA
| | - Caitlin Steckler
- Genomics Institute of the Novartis Research Foundation, 10675 John Jay Hopkins Drive, San Diego, CA 92121, USA
- Joint Center for Structural Genomics, La Jolla, CA 92037, USA
| | - Inhee Park
- Genomics Institute of the Novartis Research Foundation, 10675 John Jay Hopkins Drive, San Diego, CA 92121, USA
| | - Ansgar Brock
- Genomics Institute of the Novartis Research Foundation, 10675 John Jay Hopkins Drive, San Diego, CA 92121, USA
| | - Xiaojun Lu
- MedImmune LLC, One MedImmune Way, Gaithersburg, MD 20878, USA
| | - Ratnesh Pandey
- MedImmune LLC, One MedImmune Way, Gaithersburg, MD 20878, USA
| | - Arun Chandramohan
- National University of Singapore, Department of Biological Sciences, 14, Science Drive 4, Singapore 117543
| | - Ganesh Srinivasan Anand
- National University of Singapore, Department of Biological Sciences, 14, Science Drive 4, Singapore 117543
| | | | - Justin B Sperry
- Pfizer Inc., Analytical R&D, 700 Chesterfield Parkway West, Chesterfield, MO 63017, USA
| | - Jason C Rouse
- Pfizer Inc., Analytical R&D, 1 Burtt Road, Andover, MA 01810, USA
| | - James A Carroll
- Pfizer Inc., Analytical R&D, 700 Chesterfield Parkway West, Chesterfield, MO 63017, USA
| | - Kasper D Rand
- University of Copenhagen, Department of Pharmacy, Universitetsparken 2, DK-2100 Copenhagen, Denmark
| | - Ulrike Leurs
- University of Copenhagen, Department of Pharmacy, Universitetsparken 2, DK-2100 Copenhagen, Denmark
| | - David D Weis
- University of Kansas, Department of Chemistry, 1251 Wescoe Hall Drive, Lawrence, KS 66045, USA
| | - Mohammed A Al-Naqshabandi
- University of Kansas, Department of Chemistry, 1251 Wescoe Hall Drive, Lawrence, KS 66045, USA
- Soran University, Department of General Science, Kawa Street, Soran, Kurdistan Region, Iraq
| | - Tyler S Hageman
- University of Kansas, Department of Chemistry, 1251 Wescoe Hall Drive, Lawrence, KS 66045, USA
| | - Daniel Deredge
- University of Maryland, Baltimore, School of Pharmacy, Department of Pharmaceutical Sciences, 20 North Pine Street, Baltimore, MD 21201, USA
| | - Patrick L Wintrode
- University of Maryland, Baltimore, School of Pharmacy, Department of Pharmaceutical Sciences, 20 North Pine Street, Baltimore, MD 21201, USA
| | - Malvina Papanastasiou
- University of Pennsylvania, Department of Pathology & Laboratory Medicine, Perelman School of Medicine, 402 Stellar-Chance Labs, 422 Curie Boulevard, Philadelphia, PA 19104-6100, USA
| | - John D Lambris
- University of Pennsylvania, Department of Pathology & Laboratory Medicine, Perelman School of Medicine, 402 Stellar-Chance Labs, 422 Curie Boulevard, Philadelphia, PA 19104-6100, USA
| | - Sheng Li
- University of Southern California, Department of Medicine, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Sarah Urata
- University of Southern California, Department of Medicine, 9500 Gilman Drive, La Jolla, CA 92093, USA
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Meier-Augenstein W, Schimmelmann A. A guide for proper utilisation of stable isotope reference materials . Isotopes Environ Health Stud 2019; 55:113-128. [PMID: 30406676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Many scientific publications about stable isotope ratios suffer from flawed practices regarding calibration and normalisation of raw δ values in conjunction with prescribed δ values of reference materials. Violations of the identical treatment principle with regards to samples and standards (i.e. reference materials) and lack of adherence to SI-mandated and IUPAC-recommended nomenclature exacerbate the widespread problem of lackadaisical analytical practice and reporting. Science is supposed to strive for exactness, whereas ambiguity and jargon confound interdisciplinary communication. This contribution aims to expose typical misconceptions and avoidable errors and offers guidance toward the reproducible generation of isotope data, isotopic scale normalisation, and proper data reporting. We offer a comprehensive overview of sources of light stable isotope reference materials to best match sample matrices encountered by stable isotope practitioners with chemically similar reference materials.
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Affiliation(s)
| | - Arndt Schimmelmann
- b Department of Earth and Atmospheric Sciences , Indiana University , Bloomington , IN , USA
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43
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Li C, Peng M, Xu D, Lu H, Zhou W, Liu Y, Liu X, Chen W. Commutability assessment of reference materials for the enumeration of lymphocyte subsets. Clin Chem Lab Med 2019; 57:697-706. [PMID: 30838835 DOI: 10.1515/cclm-2018-0915] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Accepted: 11/19/2018] [Indexed: 11/15/2022]
Abstract
Background Flow cytometric enumeration of lymphocyte subsets in peripheral blood can provide important information about immune status. Commutable reference materials (RM) are crucial for maintaining accurate and comparable measurement results over time and space. Commutability assessment of RMs for lymphocyte subsets enumeration has not been reported elsewhere. Methods Lymphocyte subsets were measured in triplicate on 56 patient samples and eight RMs using two measuring systems commonly used in laboratories (FACS Canto II and Cytomics FC500). The first step was to determine the suitability of RMs and comparability of different systems with patient samples. After the requirements of suitability and comparability were met, the second step was to assess commutability following regression approach and difference in bias approach. Results Two RMs were not measurable on FC500 system for CD3-CD16/56+ and CD3-CD19+ percentages. The results of comparability showed no significant difference in the two systems. Eight RMs for CD3+CD4+ cell count, six RMs for CD3+ and CD3+CD8+ percentages, five RMs for CD3-CD16/56+ percentage, and three RMs for CD3-CD19+ percentage were commutable using the two approaches. For CD3+, CD3+CD8+ and CD3-CD19+ percentages, the results of regression approach showed that one RM was non-commutable for each parameter, while the other approach showed that the RM was commutable. Conclusions The suitability of RM and comparability of different measuring systems are prerequisites for assessing commutability. This study indicated that different approaches led to different results. The difference in bias approach is recommended for criteria relating to medical requirements and performance characteristics of measuring systems in use.
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Affiliation(s)
- Chenbin Li
- National Center for Clinical Laboratories, Beijing Hospital, National Center of Gerontology and Graduate School of Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, P.R. China
| | - Mingting Peng
- National Center for Clinical Laboratories, Beijing Hospital, National Center of Gerontology and Graduate School of Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, P.R. China
| | - Dongsheng Xu
- Department of Hematopathology, CBLPath/Sonic Healthcare, Rye Brook, NY, USA
| | - Hong Lu
- National Center for Clinical Laboratories, Beijing Hospital, National Center of Gerontology, Beijing, P.R. China
| | - Wenbin Zhou
- National Center for Clinical Laboratories, Beijing Hospital, National Center of Gerontology, Beijing, P.R. China
| | - Yanhong Liu
- National Center for Clinical Laboratories, Beijing Hospital, National Center of Gerontology and Graduate School of Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, P.R. China
| | - Xiuli Liu
- National Center for Clinical Laboratories, Beijing Hospital, National Center of Gerontology and Graduate School of Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, P.R. China
| | - Wenxiang Chen
- National Center for Clinical Laboratories, Beijing Hospital, National Center of Gerontology and Graduate School of Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, P.R. China
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44
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Görgens A, Bremer M, Ferrer-Tur R, Murke F, Tertel T, Horn PA, Thalmann S, Welsh JA, Probst C, Guerin C, Boulanger CM, Jones JC, Hanenberg H, Erdbrügger U, Lannigan J, Ricklefs FL, El-Andaloussi S, Giebel B. Optimisation of imaging flow cytometry for the analysis of single extracellular vesicles by using fluorescence-tagged vesicles as biological reference material. J Extracell Vesicles 2019; 8:1587567. [PMID: 30949308 PMCID: PMC6442110 DOI: 10.1080/20013078.2019.1587567] [Citation(s) in RCA: 184] [Impact Index Per Article: 36.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Revised: 02/15/2019] [Accepted: 02/21/2019] [Indexed: 12/21/2022] Open
Abstract
Extracellular vesicles (EVs) mediate targeted cellular interactions in normal and pathophysiological conditions and are increasingly recognised as potential biomarkers, therapeutic agents and drug delivery vehicles. Based on their size and biogenesis, EVs are classified as exosomes, microvesicles and apoptotic bodies. Due to overlapping size ranges and the lack of specific markers, these classes cannot yet be distinguished experimentally. Currently, it is a major challenge in the field to define robust and sensitive technological platforms being suitable to resolve EV heterogeneity, especially for small EVs (sEVs) with diameters below 200 nm, i.e. smaller microvesicles and exosomes. Most conventional flow cytometers are not suitable for the detection of particles being smaller than 300 nm, and the poor availability of defined reference materials hampers the validation of sEV analysis protocols. Following initial reports that imaging flow cytometry (IFCM) can be used for the characterisation of larger EVs, we aimed to investigate its usability for the characterisation of sEVs. This study set out to identify optimal sample preparation and instrument settings that would demonstrate the utility of this technology for the detection of single sEVs. By using CD63eGFP-labelled sEVs as a biological reference material, we were able to define and optimise IFCM acquisition and analysis parameters on an Amnis ImageStreamX MkII instrument for the detection of single sEVs. In addition, using antibody-labelling approaches, we show that IFCM facilitates robust detection of different EV and sEV subpopulations in isolated EVs, as well as unprocessed EV-containing samples. Our results indicate that fluorescently labelled sEVs as biological reference material are highly useful for the optimisation of fluorescence-based methods for sEV analysis. Finally, we propose that IFCM will help to significantly increase our ability to assess EV heterogeneity in a rigorous and reproducible manner, and facilitate the identification of specific subsets of sEVs as useful biomarkers in various diseases.
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Affiliation(s)
- André Görgens
- Institute for Transfusion Medicine, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
- Department of Laboratory Medicine, Clinical Research Center, Karolinska Institutet, Stockholm, Sweden
- Evox Therapeutics Limited, Oxford, UK
| | - Michel Bremer
- Institute for Transfusion Medicine, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Rita Ferrer-Tur
- Institute for Transfusion Medicine, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Florian Murke
- Institute for Transfusion Medicine, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Tobias Tertel
- Institute for Transfusion Medicine, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Peter A. Horn
- Institute for Transfusion Medicine, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | | | - Joshua A. Welsh
- Translational Nanobiology Section, Laboratory of Pathology, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | | | - Coralié Guerin
- Paris Descartes University, Paris, France
- Institut Curie, cytometry core, PSL University, Paris, France
| | - Chantal M. Boulanger
- Paris Descartes University, Paris, France
- INSERM, U970, Paris Cardiovascular Research Center—PARCC, Paris, France
| | - Jennifer C. Jones
- Translational Nanobiology Section, Laboratory of Pathology, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Helmut Hanenberg
- Department of Pediatrics III, University Children’s Hospital Essen, University Duisburg-Essen, Essen, Germany
| | - Uta Erdbrügger
- Department of Medicine, Nephrology Division, University of Virginia, Charlottesville, VA, USA
| | - Joanne Lannigan
- Flow Cytometry Core, University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Franz L. Ricklefs
- Department of Neurological Surgery, University Medical Center Hamburg Eppendorf, Hamburg, Germany
| | - Samir El-Andaloussi
- Department of Laboratory Medicine, Clinical Research Center, Karolinska Institutet, Stockholm, Sweden
- Evox Therapeutics Limited, Oxford, UK
- Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, UK
| | - Bernd Giebel
- Institute for Transfusion Medicine, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
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45
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Baylis SA, Wallace P, McCulloch E, Niesters HGM, Nübling CM. Standardization of Nucleic Acid Tests: the Approach of the World Health Organization. J Clin Microbiol 2019; 57:e01056-18. [PMID: 30257900 DOI: 10.1128/JCM.01056-18] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
The first World Health Organization (WHO) international standards (ISs) for nucleic acid amplification techniques were established two decades ago, with the initial focus on blood screening for three major viral targets, i.e., hepatitis C virus, hepatitis B virus, and human immunodeficiency virus 1. These reference materials have subsequently found utility in the diagnosis and monitoring of a wide range of infectious diseases in clinical microbiology laboratories worldwide. WHO collaborating centers develop ISs and coordinate international studies for their evaluation. The WHO Expert Committee on Biological Standardization is responsible for the endorsement of new standardization projects and the establishment of new and replacement ISs. Potencies of ISs are defined in international units (IU); the reporting in IU for assays calibrated with an IS (or secondary standards traceable to the IS) facilitates comparability of results for different assays and determination of assay parameters such as analytical sensitivities.
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Nasdala L, Corfu F, Schoene B, Tapster SR, Wall CJ, Schmitz MD, Ovtcharova M, Schaltegger U, Kennedy AK, Kronz A, Reiners PW, Yang Y, Wu F, Gain SEM, Griffin WL, Szymanowski D, Chanmuang N. C, Ende M, Valley JW, Spicuzza MJ, Wanthanachaisaeng B, Giester G. GZ7 and GZ8 - Two Zircon Reference Materials for SIMS U-Pb Geochronology. Geostand Geoanal Res 2018; 42:431-457. [PMID: 30686958 PMCID: PMC6334521 DOI: 10.1111/ggr.12239] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/20/2018] [Accepted: 08/25/2018] [Indexed: 06/09/2023]
Abstract
Here, we document a detailed characterisation of two zircon gemstones, GZ7 and GZ8. Both stones had the same mass at 19.2 carats (3.84 g) each; both came from placer deposits in the Ratnapura district, Sri Lanka. The U-Pb data are in both cases concordant within the uncertainties of decay constants and yield weighted mean 206Pb/238U ages (95% confidence uncertainty) of 530.26 Ma ± 0.05 Ma (GZ7) and 543.92 Ma ± 0.06 Ma (GZ8). Neither GZ7 nor GZ8 have been subjected to any gem enhancement by heating. Structure-related parameters correspond well with the calculated alpha doses of 1.48 × 1018 g-1 (GZ7) and 2.53 × 1018 g-1 (GZ8), respectively, and the (U-Th)/He ages of 438 Ma ± 3 Ma (2s) for GZ7 and 426 Ma ± 9 Ma (2s) for GZ8 are typical of unheated zircon from Sri Lanka. The mean U mass fractions are 680 μg g-1 (GZ7) and 1305 μg g-1 (GZ8). The two zircon samples are proposed as reference materials for SIMS (secondary ion mass spectrometry) U-Pb geochronology. In addition, GZ7 (Ti mass fractions 25.08 μg g-1 ± 0.18 μg g-1; 95% confidence uncertainty) may prove useful as reference material for Ti-in-zircon temperature estimates.
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Affiliation(s)
- Lutz Nasdala
- Institut für Mineralogie und KristallographieUniversität WienAlthanstr. 14WienA–1090Austria
| | - Fernando Corfu
- Department of Geosciences and CEED (Centre for Earth Evolution and Dynamics)University of OsloP.O. Box 1047BlindernOslo0316Norway
| | - Blair Schoene
- Department of GeosciencesPrinceton University219 Guyot HallPrincetonNJ08544USA
| | - Simon R. Tapster
- NIGL (Natural Environment Research Council, Isotope Geosciences Laboratory)British Geological SurveyNicker Hill, KeyworthNottinghamNG12 5GGUK
| | - Corey J. Wall
- Isotope Geology LaboratoryBoise State University1910 University DriveBoiseID83725USA
| | - Mark D. Schmitz
- Isotope Geology LaboratoryBoise State University1910 University DriveBoiseID83725USA
| | - Maria Ovtcharova
- Department of Earth SciencesUniversity of GenevaRue des Maraîchers 13GenevaCH‐1205Switzerland
| | - Urs Schaltegger
- Department of Earth SciencesUniversity of GenevaRue des Maraîchers 13GenevaCH‐1205Switzerland
| | - Allen K. Kennedy
- John de Laeter CentreCurtin UniversityBuilding 301, Murdoch Ct.BentleyWA6845Australia
| | - Andreas Kronz
- Geowissenschaftliches ZentrumGeorg‐August‐Universität GöttingenGoldschmidtstr. 1GöttingenD–37077Germany
| | - Peter W. Reiners
- Department of GeosciencesUniversity of Arizona1040 4th St.TucsonAZ85721USA
| | - Yue‐Heng Yang
- State Key Laboratory of Lithospheric EvolutionIGG‐CAS (Institute of Geology and Geophysics, Chinese Academy of Sciences)No. 19, Beitucheng Western RoadChaoyang DistrictBeijing100029China
| | - Fu‐Yuan Wu
- State Key Laboratory of Lithospheric EvolutionIGG‐CAS (Institute of Geology and Geophysics, Chinese Academy of Sciences)No. 19, Beitucheng Western RoadChaoyang DistrictBeijing100029China
| | - Sarah E. M. Gain
- CCFS (Australian Research Council Centre of Excellence for Core to Crust Fluid Systems) and GEMOC (Australian Research Council National Key Centre for Geochemical Evolution and Metallogeny of Continents)Department of Earth and Planetary SciencesFaculty of Science and EngineeringMacquarie University12 Wally's WalkSydneyNSW2109Australia
| | - William L. Griffin
- CCFS (Australian Research Council Centre of Excellence for Core to Crust Fluid Systems) and GEMOC (Australian Research Council National Key Centre for Geochemical Evolution and Metallogeny of Continents)Department of Earth and Planetary SciencesFaculty of Science and EngineeringMacquarie University12 Wally's WalkSydneyNSW2109Australia
| | - Dawid Szymanowski
- Department of Earth SciencesInstitute of Geochemistry and PetrologyETH ZürichClausiusstr. 25ZürichCH–8092Switzerland
| | - Chutimun Chanmuang N.
- Institut für Mineralogie und KristallographieUniversität WienAlthanstr. 14WienA–1090Austria
| | - Martin Ende
- Institut für Mineralogie und KristallographieUniversität WienAlthanstr. 14WienA–1090Austria
| | - John W. Valley
- Department of GeoscienceUniversity of Wisconsin1215 W. Dayton St.MadisonWI53706USA
| | - Michael J. Spicuzza
- Department of GeoscienceUniversity of Wisconsin1215 W. Dayton St.MadisonWI53706USA
| | - Bhuwadol Wanthanachaisaeng
- Faculty of GemsBurapha University57 Moo 1, Chon Pratan Rd.Tha MaiChanthaburi22170Thailand
- Present address:
Department of General ScienceFaculty of ScienceSrinakharinwirot University114 Sukhumvit 23Bangkok10110Thailand
| | - Gerald Giester
- Institut für Mineralogie und KristallographieUniversität WienAlthanstr. 14WienA–1090Austria
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Abbas IM, Vranic M, Hoffmann H, El-Khatib AH, Montes-Bayón M, Möller HM, Weller MG. Investigations of the Copper Peptide Hepcidin-25 by LC-MS/MS and NMR. Int J Mol Sci 2018; 19:E2271. [PMID: 30072660 PMCID: PMC6121404 DOI: 10.3390/ijms19082271] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Revised: 07/06/2018] [Accepted: 07/20/2018] [Indexed: 01/19/2023] Open
Abstract
Hepcidin-25 was identified as the main iron regulator in the human body, and it by binds to the sole iron-exporter ferroportin. Studies showed that the N-terminus of hepcidin is responsible for this interaction, the same N-terminus that encompasses a small copper(II)-binding site known as the ATCUN (amino-terminal Cu(II)- and Ni(II)-binding) motif. Interestingly, this copper-binding property is largely ignored in most papers dealing with hepcidin-25. In this context, detailed investigations of the complex formed between hepcidin-25 and copper could reveal insight into its biological role. The present work focuses on metal-bound hepcidin-25 that can be considered the biologically active form. The first part is devoted to the reversed-phase chromatographic separation of copper-bound and copper-free hepcidin-25 achieved by applying basic mobile phases containing 0.1% ammonia. Further, mass spectrometry (tandem mass spectrometry (MS/MS), high-resolution mass spectrometry (HRMS)) and nuclear magnetic resonance (NMR) spectroscopy were employed to characterize the copper-peptide. Lastly, a three-dimensional (3D) model of hepcidin-25 with bound copper(II) is presented. The identification of metal complexes and potential isoforms and isomers, from which the latter usually are left undetected by mass spectrometry, led to the conclusion that complementary analytical methods are needed to characterize a peptide calibrant or reference material comprehensively. Quantitative nuclear magnetic resonance (qNMR), inductively-coupled plasma mass spectrometry (ICP-MS), ion-mobility spectrometry (IMS) and chiral amino acid analysis (AAA) should be considered among others.
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Affiliation(s)
- Ioana M Abbas
- Federal Institute for Materials Research and Testing (BAM), Division 1.5 Protein Analysis, Richard-Willstätter-Strasse 11, 12489 Berlin, Germany.
- School of Analytical Sciences Adlershof, Humboldt-Universität zu Berlin, Unter den Linden 6, 10099 Berlin, Germany.
| | - Marija Vranic
- Federal Institute for Materials Research and Testing (BAM), Division 1.5 Protein Analysis, Richard-Willstätter-Strasse 11, 12489 Berlin, Germany.
- School of Analytical Sciences Adlershof, Humboldt-Universität zu Berlin, Unter den Linden 6, 10099 Berlin, Germany.
- Institute of Chemistry/Analytical Chemistry, University of Potsdam, 14476 Potsdam, Germany.
| | - Holger Hoffmann
- Federal Institute for Materials Research and Testing (BAM), Division 1.8 Environmental Analysis, Richard-Willstätter-Strasse 11, 12489 Berlin, Germany.
- Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
| | - Ahmed H El-Khatib
- Federal Institute for Materials Research and Testing (BAM), Division 1.1 Inorganic Trace Analysis, Richard-Willstätter-Strasse 11, 12489 Berlin, Germany.
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Ain Shams University, 11566 Cairo, Egypt.
| | - María Montes-Bayón
- Department of Physical and Analytical Chemistry, University of Oviedo, C/Julian Claveria 8, 33006 Oviedo, Spain.
| | - Heiko M Möller
- Institute of Chemistry/Analytical Chemistry, University of Potsdam, 14476 Potsdam, Germany.
| | - Michael G Weller
- Federal Institute for Materials Research and Testing (BAM), Division 1.5 Protein Analysis, Richard-Willstätter-Strasse 11, 12489 Berlin, Germany.
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Andrews KW, Gusev PA, McNeal M, Savarala S, Dang PTV, Oh L, Atkinson R, Pehrsson PR, Dwyer JT, Saldanha LG, Betz JM, Costello RB, Douglass LW. Dietary Supplement Ingredient Database (DSID) and the Application of Analytically Based Estimates of Ingredient Amount to Intake Calculations. J Nutr 2018; 148:1413S-1421S. [PMID: 31505677 PMCID: PMC6857613 DOI: 10.1093/jn/nxy092] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Revised: 02/12/2018] [Accepted: 04/19/2018] [Indexed: 01/01/2023] Open
Abstract
OBJECTIVE We describe the purpose of the Dietary Supplement Ingredient Database (DSID), the statistical methodology underlying online calculators of analytically verified supplement content estimates, and the application and significance of DSID label adjustments in nutritional epidemiology. BACKGROUND AND HISTORY During dietary supplement (DS) manufacturing, many ingredients are added at higher than declared label amounts, but overages are not standardized among manufacturers. As a result, researchers may underestimate nutrient intakes from DSs. The DSID provides statistical tools on the basis of the results of chemical analysis to convert label claims into analytically predicted ingredient amounts. These adjustments to labels are linked to DS products reported in NHANES. RATIONALE Tables summarizing the numbers of NHANES DS products with ingredient overages and below label content show the importance of DSID adjustments to labels for accurate intake calculations. RECENT DEVELOPMENTS We show the differences between analytically based estimates and labeled content for vitamin D, calcium, iodine, caffeine, and omega-3 (n-3) fatty acids and their potential impact on the accuracy of intake assessments in large surveys. Analytical overages >20% of label levels are predicted for several nutrients in 50-99% of multivitamin-mineral products (MVMs) reported in NHANES: for iodine and selenium in adult MVMs, for iodine and vitamins D and E in children's MVMs, and for iodine, chromium, and potassium in nonprescription prenatal MVMs. Predicted overages of 10-20% for calcium can be applied to most MVMs and overages >10% for folic acid in the vast majority of adult and children's MVMs. FUTURE DIRECTIONS DSID studies are currently evaluating ingredient levels in prescription prenatal MVMs and levels of constituents in botanical DSs. CONCLUSIONS We estimate that the majority of MVM products reported in NHANES have significant overages for several ingredients. It is important to account for nonlabeled additional nutrient exposure from DSs to better evaluate nutritional status in the United States.
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Affiliation(s)
- Karen W Andrews
- Nutrient Data Laboratory, Beltsville Human Nutrition Research Center, Agricultural Research Service, USDA, Beltsville, MD,Address correspondence to KWA (e-mail: )
| | - Pavel A Gusev
- Nutrient Data Laboratory, Beltsville Human Nutrition Research Center, Agricultural Research Service, USDA, Beltsville, MD
| | - Malikah McNeal
- Nutrient Data Laboratory, Beltsville Human Nutrition Research Center, Agricultural Research Service, USDA, Beltsville, MD
| | - Sushma Savarala
- Nutrient Data Laboratory, Beltsville Human Nutrition Research Center, Agricultural Research Service, USDA, Beltsville, MD
| | - Phuong Tan V Dang
- Nutrient Data Laboratory, Beltsville Human Nutrition Research Center, Agricultural Research Service, USDA, Beltsville, MD
| | - Laura Oh
- Nutrient Data Laboratory, Beltsville Human Nutrition Research Center, Agricultural Research Service, USDA, Beltsville, MD
| | - Renata Atkinson
- Nutrient Data Laboratory, Beltsville Human Nutrition Research Center, Agricultural Research Service, USDA, Beltsville, MD
| | - Pamela R Pehrsson
- Nutrient Data Laboratory, Beltsville Human Nutrition Research Center, Agricultural Research Service, USDA, Beltsville, MD
| | - Johanna T Dwyer
- Office of Dietary Supplements, NIH, US Department of Health and Human Services, Bethesda, MD
| | - Leila G Saldanha
- Office of Dietary Supplements, NIH, US Department of Health and Human Services, Bethesda, MD
| | - Joseph M Betz
- Office of Dietary Supplements, NIH, US Department of Health and Human Services, Bethesda, MD
| | - Rebecca B Costello
- Office of Dietary Supplements, NIH, US Department of Health and Human Services, Bethesda, MD
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49
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Fredriksen PM, Mamen A, Hjelle OP, Lindberg M. Handgrip strength in 6-12-year-old children: The Health Oriented Pedagogical Project (HOPP). Scand J Public Health 2018; 46:54-60. [PMID: 29754575 DOI: 10.1177/1403494818769851] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
AIMS The aim of the study was to describe the natural course of handgrip strength development in primary school children and to establish a reference material to be used in future screening studies. In addition, the study aims to investigate a possible association between handgrip strength and cardiovascular risk factors. METHODS Anthropometric measures along with results for handgrip strength, endurance tests, blood pressure and cholesterol were measured on 2272 children of both sexes. An ROC analysis was used to estimate the suitability of handgrip strength as a predictor for known cardiometabolic risk factors. RESULTS A reference material for handgrip strength is presented for boys and girls aged 6-12 years. The results indicate that handgrip strength is unsuitable as a predictor for cardiometabolic risk factors in children. CONCLUSIONS The results may be used as reference values for handgrip strength in 6-12-year-old children of both sexes. Handgrip strength may not be used as a screening tool for cardiometabolic risk factors in pre-pubertal children.
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Affiliation(s)
| | - Asgeir Mamen
- 1 Department of Health Sciences, Kristiania University College, Norway
| | - Ole Petter Hjelle
- 1 Department of Health Sciences, Kristiania University College, Norway
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50
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Horn W, Richter M, Nohr M, Wilke O, Jann O. Application of a novel reference material in an international round robin test on material emissions testing. Indoor Air 2018; 28:181-187. [PMID: 28833742 DOI: 10.1111/ina.12421] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Accepted: 08/15/2017] [Indexed: 06/07/2023]
Abstract
Emission testing of products is currently a rapidly increasing field of measurement activity. Labeling procedures for construction products are based on such emission test chamber measurements, and hence, measurement performance should be verified. One possible route is to conduct testing of one material in different laboratories within a round robin test (RRT), ideally using homogeneous reference materials, which can be used within interlaboratory studies or as part of the quality management system to ensure comparable results. The applicability of a lacquer system with nine added VOCs (hexanal, styrene, n-decane, limonene, 2-ethyl-1-hexanol, N-methyl-α-pyrrolidone, 2-ethylhexyl acrylate, dimethyl phthalate, and n-hexadecane) was evaluated in an international RRT with 55 participating laboratories. An intralaboratory quality check confirmed the homogeneity and reproducibility of the lacquer material for most of the compounds (RSD 5%-6%), which was confirmed in the RRT. However, emissions varied for the polar compound N-methyl-α-pyrrolidone and the higher boiling compounds 1,2-dimethyl phthalate, and n-hexadecane which could be traced back to analytical issues. In the RRT, the interlaboratory relative standard deviations (RSDs) ranged from 30% to 65% for all participants but for reference laboratories the range was between 20% and 45%.
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Affiliation(s)
- W Horn
- Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin, Germany
| | - M Richter
- Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin, Germany
| | - M Nohr
- Markes International GmbH, Neu-Isenburg, Germany
| | - O Wilke
- Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin, Germany
| | - O Jann
- Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin, Germany
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