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Wise SA, Kuszak AJ, Camara JE. Evolution and impact of Standard Reference Materials (SRMs) for determining vitamin D metabolites. Anal Bioanal Chem 2024; 416:2335-2358. [PMID: 38236394 DOI: 10.1007/s00216-024-05143-w] [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: 12/06/2023] [Revised: 01/08/2024] [Accepted: 01/10/2024] [Indexed: 01/19/2024]
Abstract
The National Institute of Standards and Technology (NIST), in collaboration with the National Institutes of Health, Office of Dietary Supplements (NIH ODS), introduced the first Standard Reference Material® (SRM) for determining vitamin D metabolites in 2009 motivated by significant concerns about the comparability and accuracy of different assays to assess vitamin D status. After 14 years, a suite of five serum matrix SRMs and three calibration solution SRMs are available. Values were also assigned for vitamin D metabolites in five additional SRMs intended primarily to support measurements of other clinical diagnostic markers. Both the SRMs and the certification approach have evolved from significant exogenous serum content to primarily endogenous content and from value assignment by combining the results of multiple analytical methods to the use of measurements exclusively from reference measurement procedures (RMPs). The impact of the availability of these SRMs can be assessed by both the distribution information (sales) and by reports in the scientific literature describing their use for method validation, quality control, and research. In this review, we describe the development of these SRMs, the evolution in design and value assignment, the expansion of information reported, and SRM use in validating analytical methods and providing quality assurance within the vitamin D measurement community.
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Affiliation(s)
- Stephen A Wise
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD, 20817, USA.
| | - Adam J Kuszak
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD, 20817, USA
| | - Johanna E Camara
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA
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Aijaz SM, Ruan Z, Leija C, Lytwak LA, Waddell S, Kuszak AJ, Wise SA, Sreenivasan U. Development of Certified Reference Material Solutions for Phytochemicals in Ginger and Kava. J AOAC Int 2024:qsae025. [PMID: 38530970 DOI: 10.1093/jaoacint/qsae025] [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: 09/29/2023] [Revised: 02/19/2024] [Accepted: 03/19/2024] [Indexed: 03/28/2024]
Abstract
BACKGROUND Dietary supplements derived from botanicals are commonly consumed and investigated in biomedical studies for their potential health benefits. Accurate identification and quantification of key chemical constituents from botanical ingredients is necessary for consistent product preparations and reproducible research results. Manufacturers need quantitative reference materials of the chemical constituents of interest to verify the content of ingredients and products. The rigor and reproducibility of biomedical research is enhanced through thorough characterization of the interventions used in mechanistic, clinical, and safety investigations. Quantitative reference materials enable reliable product quality assessments and reproducible research results. OBJECTIVE Solution-based certified reference material (CRM) mixes were developed as calibrants for phytochemicals in Ginger and Kava. The Kava CRM contained yangonin, desmethoxyyangonin, dihydrokavain, DL-kavain, methysticin, dihydromethysticin, flavokawain A, flavokawain B, and flavokawain C. The Ginger CRM contained 6-gingerol, 8-gingerol, 10-gingerol, 6-shogaol, 8-shogaol, and 10-shogaol. METHODS Each phytochemical was sourced as an isolated compound and assigned a purity factor by a mass balance approach accounting for residual impurities. The solution standard mixes were formulated by gravimetric addition of each phytochemical incorporating the purity factor and diluting with acetonitrile to the target concentrations of 500 µg/mL for the gingerols and shogaols, 250 µg/mL for the kavalactones and 25 µg/mL for the flavokawains. RESULTS The concentration accuracy of each component in the solution mixes was analytically verified by HPLC-UV assay comparison to an independently prepared calibration solution. Each component in the Ginger and Kava CRMs were within 5% and 7% of the target concentrations, respectively. CONCLUSIONS Homogeneous Kava and Ginger phytochemical solution mixes were produced with accurate constituent concentrations and demonstrated good stability over two years. These solution mixes were launched as commercially available CRMs. HIGHLIGHTS These mixes can be used as accurate concentration stock solutions to prepare calibrators and controls for botanical dietary supplement product testing and standardization.
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Affiliation(s)
- Sarah M Aijaz
- MilliporeSigma, 811 Paloma Drive Suite A, Round Rock, TX, USA 78665-2402
| | - Zoe Ruan
- MilliporeSigma, 811 Paloma Drive Suite A, Round Rock, TX, USA 78665-2402
| | - Christopher Leija
- MilliporeSigma, 811 Paloma Drive Suite A, Round Rock, TX, USA 78665-2402
| | - Lauren A Lytwak
- MilliporeSigma, 811 Paloma Drive Suite A, Round Rock, TX, USA 78665-2402
| | - Shelby Waddell
- MilliporeSigma, 811 Paloma Drive Suite A, Round Rock, TX, USA 78665-2402
| | - Adam J Kuszak
- Office of Dietary Supplements, National Institutes of Health, U.S. Department of Health and Human Services, 6705 Rockledge Drive, Bethesda, Maryland, USA 20817
| | - Stephen A Wise
- Office of Dietary Supplements, National Institutes of Health, U.S. Department of Health and Human Services, 6705 Rockledge Drive, Bethesda, Maryland, USA 20817
| | - Uma Sreenivasan
- MilliporeSigma, 811 Paloma Drive Suite A, Round Rock, TX, USA 78665-2402
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Wise SA, Hahm G, Burdette CQ, Tai SSC, Camara JE, Sempos CT, Williams EL. Determination of 24,25-Dihydroxyvitamin D 3 [24,25(OH) 2D 3] in Archived Vitamin D External Quality Assessment Scheme (DEQAS) Samples using a Reference Measurement Procedure with Comparison to DEQAS Participant Results and Assessment of Contribution of 24,25(OH) 2D 3 to DEQAS Assay Results. J Steroid Biochem Mol Biol 2023; 231:106318. [PMID: 37169270 DOI: 10.1016/j.jsbmb.2023.106318] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 04/19/2023] [Accepted: 05/03/2023] [Indexed: 05/13/2023]
Abstract
Ninety archived human serum samples from the Vitamin D External Quality Assessment Scheme (DEQAS) were analyzed using a reference measurement procedure (RMP) based on isotope dilution liquid chromatography - tandem mass spectrometry (ID LC-MS/MS) for the determination of 24,25-dihydroxyvitamin D3 [24,25(OH)2D3]. These 24,25(OH)2D3 results, in conjunction with concentration values assigned using RMPs for 25-hydroxyvitamin D2 [25(OH)D2] and 25-hydroxyvitamin D3 [25(OH)D3], provide a valuable resource for assessing the accuracy of measurements for 24,25(OH)2D3 and for investigating the relationship between 24,25(OH)2D3 and 25(OH)D3. Results for 24,25(OH)2D3 using the RMP were compared to DEQAS consensus values demonstrating that the consensus values were not sufficient to assess the accuracy of measurements among different laboratories and methods. A multivariable regression analysis approach using historical DEQAS consensus values for various total 25(OH)D assays was used to assess the contribution of 24,25(OH)2D3 concentration on the assay response. The response of several ligand binding assays for total 25(OH)D was shown to be impacted by the presence of 24,25(OH)2D3.
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Affiliation(s)
- Stephen A Wise
- Office of Dietary Supplements, National Institutes of Health, Bethesda, MD 20892, USA
| | - Grace Hahm
- National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899, USA
| | - Carolyn Q Burdette
- National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899, USA
| | - Susan S-C Tai
- National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899, USA
| | - Johanna E Camara
- National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899, USA
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Baeumner AJ, Gauglitz G, Mondello L, Bondi MCM, Szunerits S, Wang Q, Wise SA, Woolley AT. Sustainability in (bio-)analytical chemistry. Anal Bioanal Chem 2022; 414:6281-6284. [PMID: 35831536 DOI: 10.1007/s00216-022-04211-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/05/2022] [Indexed: 11/01/2022]
Affiliation(s)
- Antje J Baeumner
- Institute for Analytical Chemistry, Bio- and Chemosensors, University Regensburg, Regensburg, Germany.
| | - Günter Gauglitz
- Institute for Theoretical and Physical Chemistry, Eberhard-Karls-University, Tübingen, Germany.
| | - Luigi Mondello
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy.
| | - María Cruz Moreno Bondi
- Department of Analytical Chemistry, Faculty of Chemistry, Complutense University, Madrid, Spain
| | - Sabine Szunerits
- Institut d'Electronique, de Microélectronique et de Nanotechnologie (IEMN, UMR CNRS 8520), Université de Lille, Villeneuve d'Ascq, France.
| | - Qiuquan Wang
- Department of Chemistry, MOE Key Lab of Analytical Sciences, Xiamen University, Xiamen, Fujian, China.
| | - Stephen A Wise
- Office of Dietary Supplements, National Institutes of Health, Bethesda, MD, USA. .,Scientist Emeritus, National Institute of Standards and Technology (NIST), Gaithersburg, MD, USA.
| | - Adam T Woolley
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT, USA.
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Wise SA. What if using certified reference materials (CRMs) was a requirement to publish in analytical/bioanalytical chemistry journals? Anal Bioanal Chem 2022; 414:7015-7022. [PMID: 35697811 DOI: 10.1007/s00216-022-04163-8] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 05/23/2022] [Accepted: 05/31/2022] [Indexed: 12/17/2022]
Abstract
Certified reference materials (CRMs) are routinely used by analytical chemists to validate new analytical methods and to demonstrate the quality of their quantitative measurements. Even though CRMs for trace element and trace organic analysis have been available and widely used for over 50 years, the majority of papers published in analytical chemistry journals do not mention the use of CRMs. What if analytical/bioanalytical chemistry journals required the use of CRMs to publish a paper? This feature article attempts to address this question by providing examples of recent papers that have made exceptional use of CRMs to validate new analytical methods and to describe novel, alternative uses of CRMs that provide new characterization of the CRM. The potential benefits of using a CRM even when it does not have certified values for the analytes of interest are presented.
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Affiliation(s)
- Stephen A Wise
- Office of Dietary Supplements, National Institutes of Health, Bethesda, MD, 20817, USA. .,Scientist Emeritus, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA.
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Wise SA, Rodgers RP, Reddy CM, Nelson RK, Kujawinski EB, Wade TL, Campiglia AD, Liu Z. Advances in Chemical Analysis of Oil Spills Since the Deepwater Horizon Disaster. Crit Rev Anal Chem 2022; 53:1638-1697. [PMID: 35254870 DOI: 10.1080/10408347.2022.2039093] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Analytical techniques for chemical analysis of oil, oil photochemical and biological transformation products, and dispersants and their biodegradation products benefited significantly from research following the 2010 Deepwater Horizon (DWH) disaster. Crude oil and weathered-oil matrix reference materials were developed based on the Macondo well oil and characterized for polycyclic aromatic hydrocarbons, hopanes, and steranes for use to assure and improve the quality of analytical measurements in oil spill research. Advanced gas chromatography (GC) techniques such as comprehensive two-dimensional GC (GC × GC), pyrolysis GC with mass spectrometry (MS), and GC with tandem MS (GC-MS/MS) provide a greater understanding at the molecular level of composition and complexity of oil and weathering changes. The capabilities of high-resolution MS (HRMS) were utilized to extend the analytical characterization window beyond conventional GC-based methods to include polar and high molecular mass components (>400 Da) and to provide new opportunities for discovery, characterization, and investigation of photooxidation and biotransformation products. Novel separation approaches to reduce the complexity of the oil and weathered oil prior to high-resolution MS and advanced fluorescence spectrometry have increased the information available on spilled oil and transformation products. HRMS methods were developed to achieve the required precision and sensitivity for detection of dispersants and to provide molecular-level characterization of the complex surfactants. Overall, research funding following the DWH oil spill significantly advanced and expanded the use of analytical techniques for chemical analysis to support petroleum and dispersant characterization and investigations of fate and effects of not only the DWH oil spill but future spills.
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Affiliation(s)
- Stephen A Wise
- Scientist Emeritus, National Institute of Standards and Technology (NIST), Gaithersburg, MD, USA
| | - Ryan P Rodgers
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, USA
| | - Christopher M Reddy
- Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, USA
| | - Robert K Nelson
- Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, USA
| | - Elizabeth B Kujawinski
- Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, USA
| | - Terry L Wade
- Geochemical and Environmental Research Group, Texas A&M University, College Station, TX, USA
| | - Andres D Campiglia
- Department of Chemistry, University of Central Florida, Orlando, FL, USA
| | - Zhanfei Liu
- Marine Science Institute, The University of Texas at Austin, Port Aransas, TX, USA
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Wise SA. From urban dust and marine sediment to Ginkgo biloba and human serum-a top ten list of Standard Reference Materials (SRMs). Anal Bioanal Chem 2022; 414:31-52. [PMID: 34291299 PMCID: PMC8748289 DOI: 10.1007/s00216-021-03527-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [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: 05/03/2021] [Revised: 06/25/2021] [Accepted: 07/02/2021] [Indexed: 02/07/2023]
Abstract
During the past 40 years, the National Institute of Standards and Technology (NIST) has developed over 180 natural matrix Standard Reference Materials® (SRMs) for the determination of trace organic constituents in environmental, clinical, food, and dietary supplement matrices. A list of the Top Ten SRMs intended for organic analysis was identified based on selection criteria including analytical challenge to assign certified values, challenges in material preparation, novel matrices, longevity, widespread use, and unique design concept or intended use. The environmental matrix SRMs include air particulate matter, marine sediment, mussel tissue, and human serum with the focus on contaminants such as polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), chlorinated pesticides, and polybrominated diphenyl ethers (PBDEs). Human serum and plasma SRMs for clinical diagnostic markers including vitamin D metabolites represent clinical analysis, whereas infant formula, multivitamin/multielement tablets, and Ginkgo biloba constitute the food and dietary supplement matrices on the list. Each of the SRMs on the Top Ten list is discussed relative to the selection criteria and significance of the material, and several overall lessons learned are summarized.
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Affiliation(s)
- Stephen A Wise
- Office of Dietary Supplements, National Institutes of Health, Bethesda, MD, 20892, USA.
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA.
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Hosbas Coskun S, Wise SA, Kuszak AJ. The Importance of Reference Materials and Method Validation for Advancing Research on the Health Effects of Dietary Supplements and Other Natural Products. Front Nutr 2021; 8:786261. [PMID: 34970578 PMCID: PMC8713974 DOI: 10.3389/fnut.2021.786261] [Citation(s) in RCA: 2] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Accepted: 11/17/2021] [Indexed: 01/21/2023] Open
Abstract
Insufficient assessment of the identity and chemical composition of complex natural products, including botanicals, herbal remedies, and dietary supplements, hinders reproducible research and limits understanding mechanism(s) of action and health outcomes, which in turn impede improvements in clinical practice and advances in public health. This review describes available analytical resources and good methodological practices that support natural product characterization and strengthen the knowledge gained for designing and interpreting safety and efficacy investigations. The practice of validating analytical methods demonstrates that measurements of constituents of interest are reproducible and appropriate for the sample (e.g., plant material, phytochemical extract, and biological specimen). In particular, the utilization of matrix-based reference materials enables researchers to assess the accuracy, precision, and sensitivity of analytical measurements of natural product constituents, including dietary ingredients and their metabolites. Select case studies are presented where the careful application of these resources and practices has enhanced experimental rigor and benefited research on dietary supplement health effects.
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Affiliation(s)
| | | | - Adam J. Kuszak
- Office of Dietary Supplements, National Institutes of Health, Bethesda, MD, United States
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Sempos CT, Williams EL, Carter GD, Jones J, Camara JE, Burdette CQ, Hahm G, Nalin F, Duewer DL, Kuszak AJ, Merkel J, Hoofnagle AN, Lukas P, Cavalier É, Durazo-Arvizu RA, Crump PM, Popp C, Beckert C, Schultess J, Van Slooten G, Tourneur C, Pease C, Kaul R, Villarreal A, Ivison F, Fischer R, van den Ouweland JMW, Ho CS, Law EWK, Simard JN, Gonthier R, Holmquist B, Batista MC, Meadows S, Cox L, Jansen E, Khan DA, Robyak K, Creer MH, Kilbane M, Twomey PJ, Freeman J, Parker N, Yuan J, Fitzgerald R, Mushtaq S, Clarke MW, Breen N, Simpson C, Wise SA. Assessment of serum total 25-hydroxyvitamin D assays for Vitamin D External Quality Assessment Scheme (DEQAS) materials distributed at ambient and frozen conditions. Anal Bioanal Chem 2021; 414:1015-1028. [PMID: 34750644 DOI: 10.1007/s00216-021-03742-5] [Citation(s) in RCA: 2] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Revised: 10/12/2021] [Accepted: 10/18/2021] [Indexed: 10/19/2022]
Abstract
The Vitamin D External Quality Assessment Scheme (DEQAS) distributes human serum samples four times per year to over 1000 participants worldwide for the determination of total serum 25-hydroxyvitamin D [25(OH)D)]. These samples are stored at -40 °C prior to distribution and the participants are instructed to store the samples frozen at -20 °C or lower after receipt; however, the samples are shipped to participants at ambient conditions (i.e., no temperature control). To address the question of whether shipment at ambient conditions is sufficient for reliable performance of various 25(OH)D assays, the equivalence of DEQAS human serum samples shipped under frozen and ambient conditions was assessed. As part of a Vitamin D Standardization Program (VDSP) commutability study, two sets of the same nine DEQAS samples were shipped to participants at ambient temperature and frozen on dry ice. Twenty-eight laboratories participated in this study and provided 34 sets of results for the measurement of 25(OH)D using 20 ligand binding assays and 14 liquid chromatography-tandem mass spectrometry (LC-MS/MS) methods. Equivalence of the assay response for the frozen versus ambient DEQAS samples for each assay was evaluated using multi-level modeling, paired t-tests including a false discovery rate (FDR) approach, and ordinary least squares linear regression analysis of frozen versus ambient results. Using the paired t-test and confirmed by FDR testing, differences in the results for the ambient and frozen samples were found to be statistically significant at p < 0.05 for four assays (DiaSorin, DIAsource, Siemens, and SNIBE prototype). For all 14 LC-MS/MS assays, the differences in the results for the ambient- and frozen-shipped samples were not found to be significant at p < 0.05 indicating that these analytes were stable during shipment at ambient conditions. Even though assay results have been shown to vary considerably among different 25(OH)D assays in other studies, the results of this study also indicate that sample handling/transport conditions may influence 25(OH)D assay response for several assays.
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Affiliation(s)
- Christopher T Sempos
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD, 20892, USA.,Vitamin D Standardization Program LLC, Havre de Grace, MD, 21078, USA
| | | | | | - Julia Jones
- Imperial Healthcare NHS Trust, London, W6 8RF, UK
| | - Johanna E Camara
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA
| | - Carolyn Q Burdette
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA
| | - Grace Hahm
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA
| | - Federica Nalin
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA
| | - David L Duewer
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA
| | - Adam J Kuszak
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD, 20892, USA
| | - Joyce Merkel
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD, 20892, USA
| | - Andrew N Hoofnagle
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA, 98185, USA
| | - Pierre Lukas
- Clinical Chemistry, University of Liège, CHU de Liège, 4000, Liège, Belgium
| | - Étienne Cavalier
- Clinical Chemistry, University of Liège, CHU de Liège, 4000, Liège, Belgium
| | - Ramón A Durazo-Arvizu
- Biostatistics Core, The Sabin Research Institute, Keck School of Medicine, University of Southern California, Los Angeles, CA, 90027, USA
| | - Peter M Crump
- Computing and Biometry, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - Christian Popp
- Abbott Laboratories, ADD Wiesbaden Abbott GmbH, 65205, Wiesbaden, Germany
| | - Christian Beckert
- Abbott Laboratories, ADD Wiesbaden Abbott GmbH, 65205, Wiesbaden, Germany
| | - Jan Schultess
- Abbott Laboratories, ADD Wiesbaden Abbott GmbH, 65205, Wiesbaden, Germany
| | | | | | | | - Ravi Kaul
- Bio-Rad Laboratories, Clinical Diagnostics, Hercules, CA, 94547, USA
| | | | - Fiona Ivison
- Central Manchester Foundation Trust, Manchester, M13 9WL, UK
| | - Ralf Fischer
- Chromsystems Instruments & Chemicals GmbH, 82166, Gräfelfing, Germany
| | | | - Chung S Ho
- Biochemical Mass Spectrometry Unit, Department of Chemical Pathology, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, Hong Kong, 999077
| | - Emmett W K Law
- Biochemical Mass Spectrometry Unit, Department of Chemical Pathology, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, Hong Kong, 999077
| | | | | | - Brett Holmquist
- Endocrine Sciences, LabCorp Specialty Testing Group, Agoura Hills, CA, 91301, USA
| | | | - Sarah Meadows
- Medical Research Council (MRC) Elsie Widdowson Laboratory (Closed Dec. 2018), Cambridge, CB2 0SL, UK.,NIHR BRC Nutritional Biomarker Laboratory, MRC Epidemiology Unit, University of Cambridge, Cambridge, CB2 0SL, UK
| | - Lorna Cox
- Medical Research Council (MRC) Elsie Widdowson Laboratory (Closed Dec. 2018), Cambridge, CB2 0SL, UK.,NIHR BRC Nutritional Biomarker Laboratory, MRC Epidemiology Unit, University of Cambridge, Cambridge, CB2 0SL, UK
| | - Eugene Jansen
- National Institute of Public Health and the Environment (RIVM), 3720 BA, Bilthoven, The Netherlands
| | - Dilshad Ahmed Khan
- National University of Medical Sciences (NUMS), Rawalpindi, 46000, Punjab, Pakistan
| | - Kimberly Robyak
- College of Medicine, Penn State University, Hershey, PA, 17033, USA
| | - Michael H Creer
- College of Medicine, Penn State University, Hershey, PA, 17033, USA
| | - Mark Kilbane
- Clinical Chemistry, St. Vincent's University Hospital, Elm Park, Dublin 4, D04 T6F4, Ireland
| | - Patrick J Twomey
- Clinical Chemistry, St. Vincent's University Hospital, Elm Park, Dublin 4, D04 T6F4, Ireland
| | | | - Neil Parker
- Siemens-Healthineers, Tarrytown, NY, 10591, USA
| | - Jinyun Yuan
- SNIBE, Shenzhen, 518122, People's Republic of China
| | - Robert Fitzgerald
- Health Clinical Laboratories, University of California at San Diego, La Jolla, CA, 92093, USA
| | | | - Michael W Clarke
- Metabolomics Australia, Centre for Microscopy, Characterisation and Analysis, The University of Western Australia, Perth, WA, 6009, Australia
| | - Norma Breen
- Waters Technologies Ireland Ltd., Wexford, Y35 D431, Ireland
| | | | - Stephen A Wise
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD, 20892, USA. .,Scientist Emeritus, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA.
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Wise SA, Camara JE, Sempos CT, Lukas P, Le Goff C, Peeters S, Burdette CQ, Nalin F, Hahm G, Durazo-Arvizu RA, Kuszak AJ, Merkel J, Cavalier É. Vitamin D Standardization Program (VDSP) intralaboratory study for the assessment of 25-hydroxyvitamin D assay variability and bias. J Steroid Biochem Mol Biol 2021; 212:105917. [PMID: 34010687 PMCID: PMC8403635 DOI: 10.1016/j.jsbmb.2021.105917] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Revised: 04/07/2021] [Accepted: 05/04/2021] [Indexed: 12/20/2022]
Abstract
An intralaboratory study assessing assay variability and bias for determination of serum total 25-hydroxyvitamin D [25(OH)D] was conducted by the Vitamin D Standardization Program (VDSP). Thirteen assays for serum total 25(OH)D were evaluated in a single laboratory including 11 unique immunoassays and one liquid chromatography - tandem mass spectrometry (LC-MS/MS) assay. Fifty single-donor serum samples, including eight samples with high concentrations of 25(OH)D2 (> 30 nmol/L), were assigned target values for 25(OH)D2 and 25(OH)D3 using reference measurement procedures (RMP). Using four replicate measurements for each sample, the mean total percent coefficient of variation (%CV) and mean % bias from the target values were determined for each assay using the 50 single-donor samples and a 42-sample subset, which excluded 8 high 25(OH)D2 concentration samples, and compared with VDSP performance criteria of ≤ 10 % CV and ≤ ±5 % mean bias. All 12 assays achieved the performance criterion for % CV, and 9 of the 12 assays were within ≤ ±5 % mean bias. The Fujirebio Inc. assay exhibited the lowest %CV and highest percentage of individual measurements within ≤ ±5 % mean bias. Ten immunoassays exhibited changes in response due to the high 25(OH)D2 samples with Abbott, Biomérieux, DiaSorin, DIAsource, and IDS-iSYS assays having the largest deviations. The Fujirebio Inc. and Beckman Coulter assays were only minimally affected by the presence of the high 25(OH)D2 samples. Samples with high concentrations of 25(OH)D2 provided a critical performance test for immunoassays indicating that some assays may not have equal response or recovery for 25(OH)D2 and 25(OH)D3.
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Affiliation(s)
- Stephen A Wise
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD 20892, USA; Scientist Emeritus, Associate, National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899, USA.
| | - Johanna E Camara
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899, USA
| | - Christopher T Sempos
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD 20892, USA; Vitamin D Standardization Program LLC, Havre de Grace, MD 21078 USA
| | - Pierre Lukas
- Clinical Chemistry, University of Liège, CHU de Liège, B-4000 Liège, Belgium
| | - Caroline Le Goff
- Clinical Chemistry, University of Liège, CHU de Liège, B-4000 Liège, Belgium
| | - Stephanie Peeters
- Clinical Chemistry, University of Liège, CHU de Liège, B-4000 Liège, Belgium
| | - Carolyn Q Burdette
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899, USA
| | - Federica Nalin
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899, USA
| | - Grace Hahm
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899, USA
| | - Ramón A Durazo-Arvizu
- Biostatistics Core, The Sabin Research Institute, Keck School of Medicine, University of Southern California, Los Angeles, CA 90027, USA
| | - Adam J Kuszak
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD 20892, USA
| | - Joyce Merkel
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD 20892, USA
| | - Étienne Cavalier
- Clinical Chemistry, University of Liège, CHU de Liège, B-4000 Liège, Belgium
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Wise SA, Camara JE, Burdette CQ, Hahm G, Nalin F, Kuszak AJ, Merkel J, Durazo-Arvizu RA, Williams EL, Hoofnagle AN, Ivison F, Fischer R, van den Ouweland JMW, Ho CS, Law EWK, Simard JN, Gonthier R, Holmquist B, Meadows S, Cox L, Robyak K, Creer MH, Fitzgerald R, Clarke MW, Breen N, Lukas P, Cavalier É, Sempos CT. Interlaboratory comparison of 25-hydroxyvitamin D assays: Vitamin D Standardization Program (VDSP) Intercomparison Study 2 - Part 1 liquid chromatography - tandem mass spectrometry (LC-MS/MS) assays - impact of 3-epi-25-hydroxyvitamin D 3 on assay performance. Anal Bioanal Chem 2021; 414:333-349. [PMID: 34432104 DOI: 10.1007/s00216-021-03576-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [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: 05/29/2021] [Revised: 07/15/2021] [Accepted: 07/23/2021] [Indexed: 12/19/2022]
Abstract
An interlaboratory comparison study was conducted by the Vitamin D Standardization Program (VDSP) to assess the performance of liquid chromatography - tandem mass spectrometry (LC-MS/MS) assays used for the determination of serum total 25-hydroxyvitamin D (25(OH)D), which is the sum of 25-hydroxyvitamin D2 (25(OH)D2) and 25-hydroxyvitamin D3 (25(OH)D3). A set of 50 single-donor samples was assigned target values for concentrations of 25(OH)D2, 25(OH)D3, 3-epi-25-hydroxyvitamin D3 (3-epi-25(OH)D3), and 24R,25-dihydroxyvitamin D3 (24R,25(OH)2D3) using isotope dilution liquid chromatography - tandem mass spectrometry (ID LC-MS/MS). VDSP Intercomparison Study 2 Part 1 includes results from 14 laboratories using 14 custom LC-MS/MS assays. Assay performance was evaluated using mean % bias compared to the assigned target values and using linear regression analysis of the test assay mean results and the target values. Only 53% of the LC-MS/MS assays met the VDSP criterion of mean % bias ≤ |±5%|. For the LC-MS/MS assays not meeting the ≤ |±5%| criterion, four assays had mean % bias of between 12 and 21%. Based on multivariable regression analysis using the concentrations of the four individual vitamin D metabolites in the 50 single-donor samples, the performance of several LC-MS/MS assays was found to be influenced by the presence of 3-epi-25(OH)D3. The results of this interlaboratory study represent the most comprehensive comparison of LC-MS/MS assay performance for serum total 25(OH)D and document the significant impact of the lack of separation of 3-epi-25(OH)D3 and 25(OH)D3 on assay performance, particularly with regard to mean % bias.
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Affiliation(s)
- Stephen A Wise
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD, 20892, USA. .,Scientist Emeritus, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA.
| | - Johanna E Camara
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA
| | - Carolyn Q Burdette
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA
| | - Grace Hahm
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA
| | - Federica Nalin
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA
| | - Adam J Kuszak
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD, 20892, USA
| | - Joyce Merkel
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD, 20892, USA
| | - Ramón A Durazo-Arvizu
- Biostatistics Core, The Sabin Research Institute, Keck School of Medicine, University of Southern California, Los Angeles, CA, 90027, USA
| | | | - Andrew N Hoofnagle
- Department of Laboratory Medicine, University of Washington, Seattle, WA, 98185, USA
| | - Fiona Ivison
- Central Manchester Foundation Trust, Manchester, M13 9WL, UK
| | - Ralf Fischer
- Chromsystems Instruments & Chemicals GmbH, 82166, Gräfelfing, Germany
| | | | - Chung S Ho
- Biochemical Mass Spectrometry Unit, Department of Chemical Pathology, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, 999077, Hong Kong
| | - Emmett W K Law
- Biochemical Mass Spectrometry Unit, Department of Chemical Pathology, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, 999077, Hong Kong
| | | | | | - Brett Holmquist
- Endocrine Sciences, LabCorp Specialty Testing Group, Agoura Hills, CA, 91301, USA
| | - Sarah Meadows
- Medical Research Council (MRC) Elsie Widdowson Laboratory (closed Dec. 2018), Cambridge, UK.,NIHR BRC Nutritional Biomarker Laboratory, MRC Epidemiology Unit, University of Cambridge, Cambridge, CB2 0SL, UK
| | - Lorna Cox
- Medical Research Council (MRC) Elsie Widdowson Laboratory (closed Dec. 2018), Cambridge, UK.,NIHR BRC Nutritional Biomarker Laboratory, MRC Epidemiology Unit, University of Cambridge, Cambridge, CB2 0SL, UK
| | - Kimberly Robyak
- College of Medicine, Penn State University, Hershey, PA, 17033, USA
| | - Michael H Creer
- College of Medicine, Penn State University, Hershey, PA, 17033, USA
| | - Robert Fitzgerald
- Health Clinical Laboratories, University of California at San Diego, La Jolla, CA, 92093, USA
| | - Michael W Clarke
- Metabolomics Australia, Centre for Microscopy, Characterisation and Analysis, The University of Western Australia, Perth, WA, 6009, Australia
| | - Norma Breen
- Waters Technologies Ireland Ltd., Wexford, Y35 D431, Ireland
| | - Pierre Lukas
- Clinical Chemistry, University of Liège, CHU de Liège, B-4000, Liège, Belgium
| | - Étienne Cavalier
- Clinical Chemistry, University of Liège, CHU de Liège, B-4000, Liège, Belgium
| | - Christopher T Sempos
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD, 20892, USA.,Vitamin D Standardization Program LLC, Havre de Grace, MD, 217078, USA
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12
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Camara JE, Wise SA, Hoofnagle AN, Williams EL, Carter GD, Jones J, Burdette CQ, Hahm G, Nalin F, Kuszak AJ, Merkel J, Durazo-Arvizu RA, Lukas P, Cavalier É, Popp C, Beckert C, Schultess J, Van Slooten G, Tourneur C, Pease C, Kaul R, Villarreal A, Ivison F, Fischer R, van den Ouweland JMW, Ho CS, Law EWK, Simard JN, Gonthier R, Holmquist B, Batista MC, Pham H, Bennett A, Meadows S, Cox L, Jansen E, Khan DA, Robyak K, Creer MH, Kilbane M, Twomey PJ, Freeman J, Parker N, Yuan J, Fitzgerald R, Mushtaq S, Clarke MW, Breen N, Simpson C, Sempos CT. Assessment of serum total 25-hydroxyvitamin D assay commutability of Standard Reference Materials and College of American Pathologists Accuracy-Based Vitamin D (ABVD) Scheme and Vitamin D External Quality Assessment Scheme (DEQAS) materials: Vitamin D Standardization Program (VDSP) Commutability Study 2. Anal Bioanal Chem 2021; 413:5067-5084. [PMID: 34184102 PMCID: PMC8431775 DOI: 10.1007/s00216-021-03470-w] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [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: 04/06/2021] [Revised: 05/29/2021] [Accepted: 06/09/2021] [Indexed: 10/21/2022]
Abstract
An interlaboratory study was conducted through the Vitamin D Standardization Program (VDSP) to assess commutability of Standard Reference Materials® (SRMs) and proficiency testing/external quality assessment (PT/EQA) samples for determination of serum total 25-hydroxyvitamin D [25(OH)D] using ligand binding assays and liquid chromatography-tandem mass spectrometry (LC-MS/MS). A set of 50 single-donor serum samples were assigned target values for 25-hydroxyvitamin D2 [25(OH)D2] and 25-hydroxyvitamin D3 [25(OH)D3] using reference measurement procedures (RMPs). SRM and PT/EQA samples evaluated included SRM 972a (four levels), SRM 2973, six College of American Pathologists (CAP) Accuracy-Based Vitamin D (ABVD) samples, and nine Vitamin D External Quality Assessment Scheme (DEQAS) samples. Results were received from 28 different laboratories using 20 ligand binding assays and 14 LC-MS/MS methods. Using the test assay results for total serum 25(OH)D (i.e., the sum of 25(OH)D2 and 25(OH)D3) determined for the single-donor samples and the RMP target values, the linear regression and 95% prediction intervals (PIs) were calculated. Using a subset of 42 samples that had concentrations of 25(OH)D2 below 30 nmol/L, one or more of the SRM and PT/EQA samples with high concentrations of 25(OH)D2 were deemed non-commutable using 5 of 11 unique ligand binding assays. SRM 972a (level 4), which has high exogenous concentration of 3-epi-25(OH)D3, was deemed non-commutable for 50% of the LC-MS/MS assays.
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Affiliation(s)
- Johanna E Camara
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA
| | - Stephen A Wise
- Scientist Emeritus, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA.
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD, 20892, USA.
| | - Andrew N Hoofnagle
- Department of Laboratory Medicine, University of Washington, Seattle, WA, 98185, USA
| | | | | | - Julia Jones
- Imperial Healthcare NHS Trust, London, W6 8RF, UK
| | - Carolyn Q Burdette
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA
| | - Grace Hahm
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA
| | - Federica Nalin
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA
| | - Adam J Kuszak
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD, 20892, USA
| | - Joyce Merkel
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD, 20892, USA
| | - Ramón A Durazo-Arvizu
- Biostatistics Core, The Sabin Research Institute, Keck School of Medicine, University of Southern California, Los Angeles, CA, 90027, USA
| | - Pierre Lukas
- Clinical Chemistry, University of Liège, CHU de Liège, 4000, Liège, Belgium
| | - Étienne Cavalier
- Clinical Chemistry, University of Liège, CHU de Liège, 4000, Liège, Belgium
| | - Christian Popp
- Abbott Laboratories, ADD Wiesbaden Abbott GmbH, 65205, Wiesbaden, Germany
| | - Christian Beckert
- Abbott Laboratories, ADD Wiesbaden Abbott GmbH, 65205, Wiesbaden, Germany
| | - Jan Schultess
- Abbott Laboratories, ADD Wiesbaden Abbott GmbH, 65205, Wiesbaden, Germany
| | | | | | | | - Ravi Kaul
- Clinical Diagnostics, Bio-Rad Laboratories, Clinical Diagnostics, Hercules, CA, 94547, USA
| | - Alfredo Villarreal
- Clinical Diagnostics, Bio-Rad Laboratories, Clinical Diagnostics, Hercules, CA, 94547, USA
| | - Fiona Ivison
- Central Manchester Foundation Trust, Manchester, M13 9WL, UK
| | - Ralf Fischer
- Chromsystems Instruments & Chemicals GmbH, 82166, Gräfelfing, Germany
| | | | - Chung S Ho
- Biomedical Mass Spectrometry Unit, Department of Chemical Pathology, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, 999077, Hong Kong
| | - Emmett W K Law
- Biomedical Mass Spectrometry Unit, Department of Chemical Pathology, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, 999077, Hong Kong
| | | | | | - Brett Holmquist
- LabCorp Specialty Testing Group, Endocrine Sciences, Agoura Hills, CA, 91301, USA
| | | | - Heather Pham
- Immunodiagnostic Systems (IDS), Boldon, NE35 9PD, UK
| | - Alex Bennett
- Immunodiagnostic Systems (IDS), Boldon, NE35 9PD, UK
| | - Sarah Meadows
- Medical Research Council (MRC) Elsie Widdowson Laboratory (closed Dec. 2018), Cambridge, CB2 0SL, UK
- NIHR BRC Nutritional Biomarker Laboratory, MRC Epidemiology Unit, University of Cambridge, Cambridge, CB2 0SL, UK
| | - Lorna Cox
- Medical Research Council (MRC) Elsie Widdowson Laboratory (closed Dec. 2018), Cambridge, CB2 0SL, UK
- NIHR BRC Nutritional Biomarker Laboratory, MRC Epidemiology Unit, University of Cambridge, Cambridge, CB2 0SL, UK
| | - Eugene Jansen
- National Institute of Public Health and the Environment (RIVM), 3720 BA, Bilthoven, The Netherlands
| | - Dilshad Ahmed Khan
- National University of Medical Sciences (NUMS), Rawalpindi, Punjab, 46000, Pakistan
| | - Kimberly Robyak
- College of Medicine, Penn State University, Hershey, PA, 17033, USA
| | - Michael H Creer
- College of Medicine, Penn State University, Hershey, PA, 17033, USA
| | - Mark Kilbane
- Clinical Chemistry, St. Vincent's University Hospital, Elm Park, Dublin 4, D04 T6F4, Ireland
| | - Patrick J Twomey
- Clinical Chemistry, St. Vincent's University Hospital, Elm Park, Dublin 4, D04 T6F4, Ireland
| | | | - Neil Parker
- Siemens-Healthineers, Tarrytown, NY, 10591, USA
| | - Jinyun Yuan
- SNIBE, Shenzhen, 518122, People's Republic of China
| | - Robert Fitzgerald
- University of California at San Diego, Health Clinical Laboratories, La Jolla, CA, 92093, USA
| | | | - Michael W Clarke
- Metabolomics Australia, Centre for Microscopy, Characterisation and Analysis, The University of Western Australia, Perth, WA, 6009, Australia
| | - Norma Breen
- Waters Technologies Ireland Ltd., Wexford, Y35 D431, Ireland
| | | | - Christopher T Sempos
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD, 20892, USA
- Vitamin D Standardization Program LLC, Havre de Grace, MD, 21078, USA
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Boggs ASP, Kilpatrick LE, Burdette CQ, Tevis DS, Fultz ZA, Nelson MA, Jarrett JM, Kemp JV, Singh RJ, Grebe SKG, Wise SA, Kassim BL, Long SE. Development of a pregnancy-specific reference material for thyroid biomarkers, vitamin D, and nutritional trace elements in serum. Clin Chem Lab Med 2021; 59:671-679. [PMID: 33098630 PMCID: PMC9972198 DOI: 10.1515/cclm-2020-0977] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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: 06/24/2020] [Accepted: 10/06/2020] [Indexed: 11/15/2022]
Abstract
OBJECTIVES Matrix differences among serum samples from non-pregnant and pregnant patients could bias measurements. Standard Reference Material 1949, Frozen Human Prenatal Serum, was developed to provide a quality assurance material for the measurement of hormones and nutritional elements throughout pregnancy. METHODS Serum from non-pregnant women and women in each trimester were bottled into four levels based on pregnancy status and trimester. Liquid chromatography tandem mass spectrometry (LC-MS/MS) methods were developed and applied to the measurement of thyroid hormones, vitamin D metabolites, and vitamin D-binding protein (VDBP). Copper, selenium, and zinc measurements were conducted by inductively coupled plasma dynamic reaction cell MS. Thyroid stimulating hormone (TSH), thyroglobulin (Tg), and thyroglobulin antibody concentrations were analyzed using immunoassays and LC-MS/MS (Tg only). RESULTS Certified values for thyroxine and triiodothyronine, reference values for vitamin D metabolites, VDBP, selenium, copper, and zinc, and information values for reverse triiodothyronine, TSH, Tg, and Tg antibodies were assigned. Significant differences in serum concentrations were evident for all analytes across the four levels (p≤0.003). TSH measurements were significantly different (p<0.0001) among research-only immunoassays. Tg concentrations were elevated in research-only immunoassays vs. Federal Drug Administration-approved automated immunoassay and LC-MS/MS. Presence of Tg antibodies increased differences between automated immunoassay and LC-MS/MS. CONCLUSIONS The analyte concentrations' changes consistent with the literature and the demonstration of matrix interferences in immunoassay Tg measurements indicate the functionality of this material by providing a relevant matrix-matched reference material for the different stages of pregnancy.
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Affiliation(s)
- Ashley S. P. Boggs
- Corresponding author: Ashley S. P. Boggs, PhD, Research Biologist, National Institute of Standards and Technology, 331 Fort Johnson Rd, Charleston, SC 29412, USA, Phone: 843 460 9789, Fax: 843 998 6940,
| | | | | | - Denise S. Tevis
- Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Zachary A. Fultz
- Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Michael A. Nelson
- National Institute of Standards and Technology, Gaithersburg, MD, USA
| | - Jeffery M. Jarrett
- Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Jennifer V. Kemp
- Division of Clinical Biochemistry and Immunology, Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
| | - Ravinder J. Singh
- Division of Clinical Biochemistry and Immunology, Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
| | - Stefan K. G. Grebe
- Division of Clinical Biochemistry and Immunology, Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA; Division of Endocrinology, Department of Medicine, Mayo Clinic, Rochester, MN, USA
| | - Stephen A. Wise
- National Institute of Standards and Technology, Gaithersburg, MD, USA; National Institutes of Health, Office of Dietary Supplements, Bethesda, MD, USA
| | - Brittany L. Kassim
- National Institute of Standards and Technology, Hollings Marine Laboratory, Charleston, SC, USA
| | - Stephen E. Long
- National Institute of Standards and Technology, Hollings Marine Laboratory, Charleston, SC, USA
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Arif S, Al-Tameemi M, Wilson WB, Wise SA, Barbosa F, Campiglia AD. Low-temperature time-resolved phosphorescence excitation emission matrices for the analysis of phenanthro-thiophenes in chromatographic fractions of complex environmental extracts. Talanta 2020; 212:120805. [PMID: 32113567 DOI: 10.1016/j.talanta.2020.120805] [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: 11/14/2019] [Revised: 01/23/2020] [Accepted: 02/02/2020] [Indexed: 10/25/2022]
Abstract
The present study investigates the analytical potential of low-temperature photoluminescence spectroscopy for the analysis of seven phenanthrothiophenes with molecular mass 234 g mol-1. The studied PASHs include Phenanthro [1,2-b]thiophene, Phenanthro [2,1-b]thiophene, Phenanthro [2,3-b]thiophene, Phenanthro [3,2-b]thiophene, Phenanthro [3,4-b]thiophene, Phenanthro [4,3-b]thiophene and Phenanthro [9,10-b]thiophene. Excitation and emission spectra recorded from n-alkane solutions at room temperature, 77 K and 4.2 K show phosphorescence emission from all the studied isomers at cryogenic temperatures. The analytical figures of merit obtained under steady state (fluorescence) and time-resolved (phosphorescence) conditions provide limits of detection at the parts-per-billion (ng mL-1) concentration levels. Processing 77 K and 4.2 K phosphorescence data with parallel factor analysis showed to be a robust approach to the determination of phenanthro-thiophenes in complex fluorophore mixtures.
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Affiliation(s)
- Sadia Arif
- Department of Chemistry, University of Central Florida, Physical Sciences Bld. 4111, Orlando, FL 32816, USA
| | - Maha Al-Tameemi
- Department of Chemistry, College of Sciences for Women, University of Baghdad, Iraq
| | - Walter B Wilson
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Mail Stp 8390, Gaithersburg, MD, USA
| | - Stephen A Wise
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Mail Stp 8390, Gaithersburg, MD, USA
| | - Fernando Barbosa
- Department of Chemistry, University of Central Florida, Physical Sciences Bld. 4111, Orlando, FL 32816, USA
| | - Andres D Campiglia
- Department of Chemistry, University of Central Florida, Physical Sciences Bld. 4111, Orlando, FL 32816, USA.
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Gauglitz G, Wise SA. Analytical and Bioanalytical Chemistry (ABC): tradition and vision. Anal Bioanal Chem 2020; 412:3951-3953. [PMID: 32318765 DOI: 10.1007/s00216-020-02619-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Günter Gauglitz
- Institute for Theoretical and Physical Chemistry, Eberhard-Karls-University, Tübingen, Germany.
| | - Stephen A Wise
- Office of Dietary Supplements, National Institutes of Health, (NIH-ODS), Bethesda, MD, USA.
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Sharpless KE, Schiller SB, Margolis SA, Thomas JB, Iyengar GV, Colbert JC, Gills TE, Wise SA, Tanner JT, Wolf WR. Certification of Nutrients in Standard Reference Material 1846: Infant Formula. J AOAC Int 2020. [DOI: 10.1093/jaoac/80.3.611] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract
In 1996, the National Institute of Standards and Technology (NIST) released Standard Reference Material 1846 (Infant Formula), which can be used as a control material for assigning values to in-house control materials and for validating analytical methods for measurement of proximates, vitamins, and minerals in infant formula and similar matrixes. The SRM was manufactured by preparing a spray-dried formula base containing fat, protein, carbohydrates, and minerals and then combining that formula base with a dry-blend vitamin premix that supplied the vitamins. The Certificate of Analysis for SRM 1846 provides assigned values for concentrations of proximates (fat, protein, etc.), vitamins, and minerals for which product labeling is required by the Infant Formula Act of 1980 and by the Nutrition Labeling and Education Act of 1990. These assigned values were based on agreement of measurements by NIST and/or collaborating laboratories. Certified values are provided for vitamins A (trans), E, C, B2, and Be and niacin. Noncertified values are provided for solids, ash, fat, nitrogen, protein, carbohydrate, calories, vitamin D, δ-tocopherol, γ-tocopherol, vitamin Bi, vitamin B12, folic acid, pantothenic acid, biotin, choline, inositol, calcium, phosphorus, magnesium, iron, zinc, copper, sodium, potassium, and chloride. Information values are provided for iodine, manganese, selenium, and vitamin K.
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Affiliation(s)
- Katherine E Sharpless
- National Institute of Standards and Technology, Chemistry B208, Gaithersburg, MD 20899
| | - Susannah B Schiller
- National Institute of Standards and Technology, Chemistry B208, Gaithersburg, MD 20899
| | - Sam A Margolis
- National Institute of Standards and Technology, Chemistry B208, Gaithersburg, MD 20899
| | - Jeanice Brown Thomas
- National Institute of Standards and Technology, Chemistry B208, Gaithersburg, MD 20899
| | - G Venkatesh Iyengar
- National Institute of Standards and Technology, Chemistry B208, Gaithersburg, MD 20899
| | - Jennifer C Colbert
- National Institute of Standards and Technology, Chemistry B208, Gaithersburg, MD 20899
| | - Thomas E Gills
- National Institute of Standards and Technology, Chemistry B208, Gaithersburg, MD 20899
| | - Stephen A Wise
- National Institute of Standards and Technology, Chemistry B208, Gaithersburg, MD 20899
| | - James T Tanner
- U.S. Food and Drug Administration, HFS-451, Center for Food Safety and Applied Nutrition, Washington, DC 20204
| | - Wayne R Wolf
- U.S. Department of Agriculture, Bldg. 161 BARC-East, 10300 Baltimore Ave, Beltsville, MD 20705
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Sharpless KE, Gill LM, Margolis SA, Wise SA, Elkins E. Preparation of Standard Reference Material 2383 (Baby Food Composite) and Use of an Interlaboratory Comparison Exercise for Value Assignment of Its Nutrient Concentrations. J AOAC Int 2020. [DOI: 10.1093/jaoac/82.2.276] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Abstract
The preparation of the recently released Standard Reference Material (SRM) 2383 Baby Food Composite and the process used for value assignment of nutrient concentrations are reported. SRM 2383 can be used as a control material when assigning values to in-house control materials and when validating analytical methods for measuring proximates, vitamins, and minerals in baby food and similar matrixes. The SRM was prepared as a commercial baby food would be prepared, with the same ingredients. The Certificate of Analysis for SRM 2383 provides assigned values for concentrations of proximates, vitamins, and minerals for which product labeling is required by the Nutrition Labeling and Education Act of 1990. These assigned values were based on measurements by the National Institute of Standards and Technology (NIST) and/or collaborating laboratories. Assignment of analyte concentrations based solely on analyses by collaborating laboratories is described in this paper. Certified values are provided for retinol, tocopherols, and several carotenoids including total β-carotene; the certification of and methodology used for measurement of these analytes is discussed in a companion paper (this issue, page 288). Reference values are provided for solids, ash, fat, nitrogen, protein, carbohydrate, calories, vitamin B1, vitamin B2, vitamin B6, niacin, biotin, calcium, phosphorus, magnesium, manganese, iron, zinc, copper, sodium, potassium, and chloride. Reference values for additional carotenoids are reported in the companion paper (this issue, page 288). Information values are provided for iodine, selenium, molybdenum, vitamin D, vitamin B12, folic acid, pantothenic acid, choline, inositol, sugars, total dietary fiber, and 3 classes of fats.
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Affiliation(s)
- Katherine E Sharpless
- National Institute of Standards and Technology, 100 Bureau Dr, Stop 8392, Gaithersburg, MD 20899-8392
| | - Lisa M Gill
- National Institute of Standards and Technology, 100 Bureau Dr, Stop 8392, Gaithersburg, MD 20899-8392
| | - Sam A Margolis
- National Institute of Standards and Technology, 100 Bureau Dr, Stop 8392, Gaithersburg, MD 20899-8392
| | - Stephen A Wise
- National Institute of Standards and Technology, 100 Bureau Dr, Stop 8392, Gaithersburg, MD 20899-8392
| | - Edgar Elkins
- National Food Processors Association, 1401 New York Ave, NW, Washington, DC 20005
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Sharpless KE, Lindstrom RM, Nelson BC, Phinney KW, Rimmer CA, Sander LC, Schantz MM, Spatz RO, Thomas JB, Turk GC, Wise SA, Wood LJ, Yen JH. Preparation and Characterization of Standard Reference Material 1849 Infant/Adult Nutritional Formula. J AOAC Int 2019. [DOI: 10.1093/jaoac/93.4.1262] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Abstract
Standard Reference Material (SRM) 1849 Infant/Adult Nutritional Formula has been issued by the National Institute of Standards and Technology (NIST) as a replacement for SRM 1846 Infant Formula, issued in 1996. Extraction characteristics of SRM 1846 have changed over time, as have NIST's analytical capabilities. While certified mass fraction values were provided for five constituents in SRM 1846 (four vitamins plus iodine), certified mass fraction values for 43 constituents are provided in SRM 1849 (fatty acids, elements, and vitamins) and reference mass fraction values are provided for an additional 43 constituents including amino acids and nucleotides, making it the most extensively characterized food-matrix SRM available from NIST.
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Affiliation(s)
- Katherine E Sharpless
- National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899-8390
| | - Richard M Lindstrom
- National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899-8390
| | - Bryant C Nelson
- National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899-8390
| | - Karen W Phinney
- National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899-8390
| | - Catherine A Rimmer
- National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899-8390
| | - Lane C Sander
- National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899-8390
| | - Michele M Schantz
- National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899-8390
| | - Rabia O Spatz
- National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899-8390
| | - Jeanice Brown Thomas
- National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899-8390
| | - Gregory C Turk
- National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899-8390
| | - Stephen A Wise
- National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899-8390
| | - Laura J Wood
- National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899-8390
| | - James H Yen
- National Institute of Standards and Technology, Statistical Engineering Division, Gaithersburg, MD 20899-8980
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Sharpless KE, Anderson DL, Betz JM, Butler TA, Capar SG, Cheng J, Fraser CA, Gardner G, Gay ML, Howell DW, Ihara T, Khan MA, Lam JW, Long SE, McCooeye M, Mackey EA, Mindak WR, Mitvalsky S, Murphy KE, Nguyenpho A, Phinney KW, Porter BJ, Roman M, Sander LC, Satterfield MB, Scriver C, Sturgeon R, Thomas JB, Vocke RD, Wise SA, Wood LJ, Yang L, Yen JH, Ziobro GC. Preparation and Characterization of a Suite of Ephedra-Containing Standard Reference Materials. J AOAC Int 2019. [DOI: 10.1093/jaoac/89.6.1483] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract
The National Institute of Standards and Technology, the U.S. Food and Drug Administration, Center for Drug Evaluation and Research and Center for Food Safety and Applied Nutrition, and the National Institutes of Health, Office of Dietary Supplements, are collaborating to produce a series of Standard Reference Materials (SRMs) for dietary supplements. A suite of ephedra materials is the first in the series, and this paper describes the acquisition, preparation, and value assignment of these materials: SRMs 3240 Ephedra sinica Stapf Aerial Parts, 3241 E. sinica Stapf Native Extract, 3242 E. sinica Stapf Commercial Extract, 3243 Ephedra-Containing Solid Oral Dosage Form, and 3244 Ephedra-Containing Protein Powder. Values are assigned for ephedrine alkaloids and toxic elements in all 5 materials. Values are assigned for other analytes (e.g., caffeine, nutrient elements, proximates, etc.) in some of the materials, as appropriate. Materials in this suite of SRMs are intended for use as primary control materials when values are assigned to in-house (secondary) control materials and for validation of analytical methods for the measurement of alkaloids, toxic elements, and, in the case of SRM 3244, nutrients in similar materials.
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Affiliation(s)
- Katherine E Sharpless
- National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899-8390
| | - David L Anderson
- U.S. Food and Drug Administration, Center for Food Safety and Applied Nutrition, College Park, MD 20740-3835
| | - Joseph M Betz
- National Institutes of Health, Office of Dietary Supplements, Bethesda, MD 20892
| | - Therese A Butler
- National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899-8392
| | - Stephen G Capar
- U.S. Food and Drug Administration, Center for Food Safety and Applied Nutrition, College Park, MD 20740-3835
| | - John Cheng
- U.S. Food and Drug Administration, Center for Food Safety and Applied Nutrition, College Park, MD 20740-3835
| | | | - Graeme Gardner
- National Research Council Canada, Ottawa, Ontario, Canada K1A 0R9
| | - Martha L Gay
- U.S. Food and Drug Administration, Center for Food Safety and Applied Nutrition, College Park, MD 20740-3835
| | | | - Toshihide Ihara
- National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899-8392
| | - Mansoor A Khan
- U.S. Food and Drug Administration, Center for Drug Evaluation and Research, Silver Spring, MD 20993
| | - Joseph W Lam
- National Research Council Canada, Ottawa, Ontario, Canada K1A 0R9
| | - Stephen E Long
- National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899-8392
| | | | - Elizabeth A Mackey
- National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899-8395
| | - William R Mindak
- U.S. Food and Drug Administration, Center for Food Safety and Applied Nutrition, College Park, MD 20740-3835
| | | | - Karen E Murphy
- National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899-8391
| | - Agnes Nguyenpho
- U.S. Food and Drug Administration, Center for Drug Evaluation and Research, Silver Spring, MD 20993
| | - Karen W Phinney
- National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899-8392
| | - Barbara J Porter
- National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899-8392
| | | | - Lane C Sander
- National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899-8392
| | - Mary B Satterfield
- National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899-8392
| | | | - Ralph Sturgeon
- National Research Council Canada, Ottawa, Ontario, Canada K1A 0R9
| | - Jeanice Brown Thomas
- National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899-8392
| | - Robert D Vocke
- National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899-8392
| | - Stephen A Wise
- National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899-8392
| | - Laura J Wood
- National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899-8392
| | - Lu Yang
- National Research Council Canada, Ottawa, Ontario, Canada K1A 0R9
| | - James H Yen
- National Institute of Standards and Technology, Statistical Engineering Division, Gaithersburg, MD 20899-8980
| | - George C Ziobro
- U.S. Food and Drug Administration, Center for Food Safety and Applied Nutrition, College Park, MD 20740-3835
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Wise SA. In honor of Philippe Garrigues. Anal Bioanal Chem 2019; 411:6779-6781. [DOI: 10.1007/s00216-019-02071-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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22
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Hayes HV, Wilson WB, Santana AM, Campiglia AD, Sander LC, Wise SA. Determination of molecular mass 302 polycyclic aromatic hydrocarbons in Standard Reference Material 1597a by reversed-phase liquid chromatography and constant energy synchronous fluorescence spectroscopy. Microchem J 2019. [DOI: 10.1016/j.microc.2019.104061] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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23
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Albinet A, Lanzafame GM, Srivastava D, Bonnaire N, Nalin F, Wise SA. Analysis and determination of secondary organic aerosol (SOA) tracers (markers) in particulate matter standard reference material (SRM 1649b, urban dust). Anal Bioanal Chem 2019; 411:5975-5983. [DOI: 10.1007/s00216-019-02015-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Revised: 06/13/2019] [Accepted: 07/02/2019] [Indexed: 10/26/2022]
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Carter GD, Ahmed F, Berry J, Cavalier E, Durazo-Arvizu R, Gunter E, Jones G, Jones J, Phinney K, Sempos CT, Twomey PJ, Williams EL, Wise SA. External Quality Assessment of 24,25-dihydroxyvitamin D 3 (24,25(OH) 2D 3) assays. J Steroid Biochem Mol Biol 2019; 187:130-133. [PMID: 30476591 DOI: 10.1016/j.jsbmb.2018.11.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Revised: 11/18/2018] [Accepted: 11/23/2018] [Indexed: 01/31/2023]
Abstract
The discovery that mutations of the CYP24A1 gene are a cause of idiopathic infantile hypercalcemia (IIH) has revived interest in measuring serum 24,25(OH)2D3. Several studies have also suggested that a high 25-hydroxyvitamin D3(25-OHD3):24,25(OH)2D3 ratio might provide additional diagnostic information in the investigation of vitamin D deficiency. Measurement of 24,25(OH)2D3 is necessarily restricted to laboratories with mass spectrometry methods although cross reactivity of the metabolite in immunoassays for 25-OHD is a potential cause of misleading results. The international External Quality Assessment (EQA) scheme for vitamin D metabolites (DEQAS) was set up in 1989. In 2013 DEQAS became an accuracy based EQA for 25-OHD with 'target values' assigned by the National Institute of Standards and Technology (NIST) Reference Measurement Procedure (RMP). A pilot scheme for serum 24,25(OH)2D3 was started in 2015 and participants were asked to measure the metabolite on each of the 5 samples sent out for 25-OHD. Inter-laboratory agreement was poor but this may reflect methodological differences, in particular different approaches to assay standardization. An important potential contribution to reducing variability among assays was the development by NIST of a 24,25(OH)2D3 RMP and its use in assigning values to SRMs 972a, 2973 and 2971, supported by the NIH Office of Dietary Supplements (ODS) as part of the Vitamin D Standardization Program (VDSP) effort.
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Affiliation(s)
- G D Carter
- Imperial College Healthcare NHS Trust, Charing Cross Hospital, London, W6 8RF, United Kingdom.
| | - F Ahmed
- Imperial College Healthcare NHS Trust, Charing Cross Hospital, London, W6 8RF, United Kingdom
| | - J Berry
- DEQAS Advisory Panel, Charing Cross Hospital, London, W6 8RF, United Kingdom
| | - E Cavalier
- DEQAS Advisory Panel, Charing Cross Hospital, London, W6 8RF, United Kingdom
| | - R Durazo-Arvizu
- DEQAS Advisory Panel, Charing Cross Hospital, London, W6 8RF, United Kingdom
| | - E Gunter
- DEQAS Advisory Panel, Charing Cross Hospital, London, W6 8RF, United Kingdom
| | - G Jones
- DEQAS Advisory Panel, Charing Cross Hospital, London, W6 8RF, United Kingdom
| | - J Jones
- Imperial College Healthcare NHS Trust, Charing Cross Hospital, London, W6 8RF, United Kingdom
| | - K Phinney
- DEQAS Advisory Panel, Charing Cross Hospital, London, W6 8RF, United Kingdom
| | - C T Sempos
- DEQAS Advisory Panel, Charing Cross Hospital, London, W6 8RF, United Kingdom
| | - P J Twomey
- DEQAS Advisory Panel, Charing Cross Hospital, London, W6 8RF, United Kingdom
| | - E L Williams
- Imperial College Healthcare NHS Trust, Charing Cross Hospital, London, W6 8RF, United Kingdom
| | - S A Wise
- National Institutes of Health (NIH) Office of Dietary Supplements (ODS), Bethesda, MD, 20892-7517, USA
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Al-Tameemi M, Arif S, Campiglia AD, Wilson WB, Wise SA. Photoluminescence spectroscopy of anthrathiophenes and benzonaphthothiophenes in Shpol'skii matrixes. Talanta 2019; 194:930-940. [PMID: 30609627 DOI: 10.1016/j.talanta.2018.10.044] [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: 07/09/2018] [Revised: 10/04/2018] [Accepted: 10/05/2018] [Indexed: 10/28/2022]
Abstract
The dispersion of harmful oil components into the ocean waters could pose long-term risks to flora and fauna. Due to the complexity of oil-contaminated sites, the unambiguous identification and quantitation of environmental pollutants often requires the sequence of high-performance liquid chromatography and gas chromatography-mass spectrometry. A classic example is the analysis of polycyclic aromatic hydrocarbons. This article tackles a different aspect of environmental analysis as it focuses on the Shpol'skii spectroscopy of polycyclic aromatic sulfur heterocycles, specifically those belonging to the subgroups often known as anthrathiophenes and benzonaphthothiophenes. Photoluminescence measurements were made with a commercial spectrofluorimeter equipped with a continuous wave excitation source for steady state measurements and a pulsed excitation source for time-resolved measurements in the phosphorescence time domain. To the extent of our literature search, this is the first report on the 4.2 K fluorescence and phosphorescence spectra of anthrathiophenes and benzonaphthothiophenes, and the 77 K and 4.2 K phosphorescence lifetimes of benzonaphthothiophenes. 77 K and 4.2 K analytical figures of merit revealed the possibility to detect the studied compounds at the parts-per-billion (ng mL-1) concentration levels. The spectral and lifetime data gathered in this article provides the required information to choose an appropriate photoluminescence technique for the analysis of four-ring polycyclic aromatic sulfur heterocycles in complex environmental extracts.
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Affiliation(s)
- M Al-Tameemi
- Department of Chemistry, College of Sciences for Women, University of Baghdad, Baghdad, Iraq
| | - S Arif
- Department of Chemistry, University of Central Florida, Physical Sciences Bld. 4111, Orlando, FL 32816, USA
| | - A D Campiglia
- Department of Chemistry, University of Central Florida, Physical Sciences Bld. 4111, Orlando, FL 32816, USA.
| | - W B Wilson
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Mail Stop 8390, Gaithersburg, MD 20899, USA
| | - S A Wise
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Mail Stop 8390, Gaithersburg, MD 20899, USA
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26
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Betz JM, Rimmer CA, Saldanha LG, Phillips MM, Andrews KW, Wise SA, Wood LJ, Kuszak AJ, Gusev PA, Pehrsson PR. Challenges in Developing Analytically Validated Laboratory-Derived Dietary Supplement Databases. J Nutr 2018; 148:1406S-1412S. [PMID: 31505676 PMCID: PMC6857616 DOI: 10.1093/jn/nxy134] [Citation(s) in RCA: 9] [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: 12/07/2017] [Revised: 02/12/2018] [Accepted: 06/05/2018] [Indexed: 12/13/2022] Open
Abstract
The Dietary Supplement Label Database (DSLD) is sponsored by the Office of Dietary Supplements (ODS) and the National Library of Medicine (NLM). It provides a searchable, free database of the contents of ∼65,000 supplement labels. A companion database of analytically verified product labels [the Dietary Supplement Ingredient Database (DSID)] was created by ODS, NLM, and the USDA. There are considerable challenges to populating both databases, but the DSID faces unique analytic chemistry challenges. This article describes the challenges to creating analytically verified marketplace surveys of dietary supplement (DS) product content claims for inclusion in public databases. Nutritionists and public health scientists require information on actual exposures to DS constituents because labeled content may not match labeled product content. Analytic verification of composition of DSs provides a link to actual exposure. A public database of analytically derived DS content was developed to provide more accurate estimates of dietary intake in population-based epidemiologic studies. The DSID has conducted surveys of several types of vitamin- and mineral-containing DSs. Results showing label content claims as analytically derived values are available in the current DSID. A recent pilot project explored the feasibility of adding botanical DS products to the DSID. Candidates for future botanical DSID studies will be based on sales volume, potential public health impacts, and the availability of validated analytic methods and reference materials. Databases like DSID and the DSLD are essential for researchers and clinicians to evaluate dietary ingredient intakes in population-based epidemiologic studies. Together, these databases provide a picture of the DS marketplace. The DSID provides an analytic survey of marketed DSs. However, selection of future botanical supplements for DSID evaluation involves analytic challenges. Even when appropriate resources are available, method selection and data evaluation are resource- and time-consuming.
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Affiliation(s)
- Joseph M Betz
- Office of Dietary Supplements, National Institutes of Health, Bethesda, MD
| | - Catherine A Rimmer
- Chemical Sciences Division, National Institute of Standards and Technology, Gaithersburg, MD
| | - Leila G Saldanha
- Office of Dietary Supplements, National Institutes of Health, Bethesda, MD
| | - Melissa M Phillips
- Chemical Sciences Division, National Institute of Standards and Technology, Gaithersburg, MD
| | - Karen W Andrews
- Nutrient Data Laboratory, Agricultural Research Service, US Department of Agriculture, Beltsville, MD
| | - Stephen A Wise
- Office of Dietary Supplements, National Institutes of Health, Bethesda, MD
| | - Laura J Wood
- Chemical Sciences Division, National Institute of Standards and Technology, Gaithersburg, MD
| | - Adam J Kuszak
- Office of Dietary Supplements, National Institutes of Health, Bethesda, MD
| | - Pavel A Gusev
- Nutrient Data Laboratory, Agricultural Research Service, US Department of Agriculture, Beltsville, MD
| | - Pamela R Pehrsson
- Nutrient Data Laboratory, Agricultural Research Service, US Department of Agriculture, Beltsville, MD
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27
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Wilson WB, Hayes HV, Campiglia AD, Wise SA. Qualitative characterization of three combustion-related standard reference materials for polycyclic aromatic sulfur heterocycles and their alkyl-substituted derivatives via normal-phase liquid chromatography and gas chromatography/mass spectrometry. Anal Bioanal Chem 2018; 410:4177-4188. [PMID: 29732496 PMCID: PMC6193260 DOI: 10.1007/s00216-018-1065-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [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: 01/24/2018] [Revised: 03/23/2018] [Accepted: 04/05/2018] [Indexed: 10/17/2022]
Abstract
The research described here provides the most comprehensive qualitative characterization of three combustion-related standard reference materials (SRMs) for polycyclic aromatic sulfur heterocycles (PASHs) and some alkyl-substituted (alkyl-) derivatives to date: SRM 1597a (coal tar), SRM 1991 (coal tar/petroleum extract), and SRM 1975 (diesel particulate extract). An analytical approach based on gas chromatography/mass spectrometry (GC/MS) is presented for the determination of three-, four-, and five-ring PASH isomers and three- and four-ring alkyl-PASHs in the three SRM samples. The benefit of using a normal-phase liquid chromatography (NPLC) fractionation procedure prior to GC/MS analysis was demonstrated for multiple isomeric PASH groups. Using a semi-preparative aminopropyl (NH2) LC column, the three combustion-related samples were fractionated based on the number of aromatic carbon atoms. The NPLC-GC/MS method presented here allowed for the following identification breakdown: SRM 1597a - 35 PASHs and 59 alkyl-PASHs; SRM 1991-31 PASHs and 58 alkyl-PASHs; and SRM 1975-13 PASHs and 25 alkyl-PASHs. These identifications were based on NPLC retention data, the GC retention times of reference standards, and the predominant molecular ion peak in the mass spectrum. Prior to this study, only 11, 1, and 0 PASHs/alkyl-PASHs had been identified in SRM 1597a, SRM 1991, and SRM 1975, respectively. Graphical abstract NPLC-GC/MS analysis for the three- and four-ring parent PASH isomers in SRM 1597a.
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Affiliation(s)
- Walter B Wilson
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA.
| | - Hugh V Hayes
- Department of Chemistry, University of Central Florida, Orlando, Florida, 32816, USA
| | - Andres D Campiglia
- Department of Chemistry, University of Central Florida, Orlando, Florida, 32816, USA
| | - Stephen A Wise
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA
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28
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Affiliation(s)
- Stephen A Wise
- Office of Dietary Supplements, National Institutes of Health (NIH-ODS), Bethesda, MD, USA.
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29
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Carter GD, Berry J, Durazo-Arvizu R, Gunter E, Jones G, Jones J, Makin HLJ, Pattni P, Sempos CT, Twomey P, Williams EL, Wise SA. Hydroxyvitamin D assays: An historical perspective from DEQAS. J Steroid Biochem Mol Biol 2018; 177:30-35. [PMID: 28734989 DOI: 10.1016/j.jsbmb.2017.07.018] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/08/2017] [Revised: 07/13/2017] [Accepted: 07/17/2017] [Indexed: 11/17/2022]
Abstract
Recent years have seen a substantial increase in demand for 25-hydroxyvitamin D (25-OHD) assays. DEQAS (the Vitamin D External Quality Assessment Scheme) has been monitoring the performance of these assays since 1989. The first DEQAS distribution was in June 1989 and results were submitted by 13 laboratories in the UK, two of which used HPLC/UV; the rest used ligand binding assays with a tritium tracer. Inter-laboratory CVs (ALTM) ranged from 29.3% (42.7nmol/L) to 53.7% (20.0nmol/L). Currently the scheme has participants in 56 countries using 30 methods or variants of methods. In January 2017, 918 participants returned results and inter-laboratory CVs (ALTM) ranged from 10.3% (73.1nmol/L) to 15.3% (29.4nmol/L). Over the last 27 years, there have been a number of significant milestones in assay development. The first major advance was the development of an iodinated 25-OHD tracer by Hollis and Napoli in 1992, subsequently used in an RIA kit marketed by DiaSorin. This and other commercial radioimmunoassays that followed brought 25-OHD assays within reach of many more non-specialist routine laboratories. With the introduction of fully automated non-isotopic assays without solvent extraction, measurement of 25-OHD became available to any clinical chemistry laboratory with an appropriate analytical platform. However, as the limitations of these non-extraction assays became apparent more laboratories started using LC-MS/MS methodology. Meanwhile the variable accuracy of 25-OHD methods has been addressed by the Vitamin D Standardization Program (VDSP) which encourages manufacturers to produce methods traceable to the reference measurement procedures (RMPs) of NIST, University of Ghent and the Centers for Disease Control and Prevention (CDC). DEQAS changed to an accuracy-based scheme in 2013 and now assesses assay accuracy against the NIST RMP. This review will use DEQAS results and statistics to chart the historical development in 25-OHD assay technology and highlight some of the problems encountered in obtaining reliable results for this most challenging of analytes.
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Affiliation(s)
- G D Carter
- Imperial College Healthcare NHS Trust, Clinical Biochemistry Department, Charing Cross Hospital, London W6 8RF, UK.
| | - J Berry
- DEQAS Advisory Panel, Charing Cross Hospital, London W6 8RF, UK
| | - R Durazo-Arvizu
- DEQAS Advisory Panel, Charing Cross Hospital, London W6 8RF, UK
| | - E Gunter
- DEQAS Advisory Panel, Charing Cross Hospital, London W6 8RF, UK
| | - G Jones
- DEQAS Advisory Panel, Charing Cross Hospital, London W6 8RF, UK
| | - J Jones
- Imperial College Healthcare NHS Trust, Clinical Biochemistry Department, Charing Cross Hospital, London W6 8RF, UK
| | - H L J Makin
- DEQAS Advisory Panel, Charing Cross Hospital, London W6 8RF, UK
| | - P Pattni
- Imperial College Healthcare NHS Trust, Clinical Biochemistry Department, Charing Cross Hospital, London W6 8RF, UK
| | - C T Sempos
- DEQAS Advisory Panel, Charing Cross Hospital, London W6 8RF, UK; National Institutes of Health (NIH) Office of Dietary Supplements (ODS), Bethesda, MD 20892-7517, USA
| | - P Twomey
- DEQAS Advisory Panel, Charing Cross Hospital, London W6 8RF, UK
| | - E L Williams
- Imperial College Healthcare NHS Trust, Clinical Biochemistry Department, Charing Cross Hospital, London W6 8RF, UK
| | - S A Wise
- National Institutes of Health (NIH) Office of Dietary Supplements (ODS), Bethesda, MD 20892-7517, USA
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Oña-Ruales JO, Ruiz-Morales Y, Alvarez-Ramírez F, Wilson WB, Wise SA. The Influence of Aromaticity in Gas Chromatography Retention: The Case of Polycyclic Aromatic Sulfur Heterocycles. Chromatographia 2018. [DOI: 10.1007/s10337-017-3465-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Hayes HV, Wilson WB, Sander LC, Wise SA, Campiglia AD. Determination of polycyclic aromatic hydrocarbons with molecular mass 302 in Standard Reference Material 1597a by reversed-phase liquid chromatography and stop-flow fluorescence detection. Anal Methods 2018; 10:10.1039/C8AY00760H. [PMID: 31093300 PMCID: PMC6512832 DOI: 10.1039/c8ay00760h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The identification of isomeric polycyclic aromatic hydrocarbons (PAHs) in complex samples via reversed-phase liquid chromatography (RPLC) with fluorescence detection (FL) is normally based on matching the chromatographic retention times of suspected peaks of interest with reference standards. Since no spectral information is obtained during the chromatographic run, the accurate identification of co-eluting PAHs with similar chromatographic behaviors requires confirmation with additional chromatographic methods. This is particularly true for the analysis of PAH isomers with the relative molecular mass (MM, g/mol) 302. The work presented here explores the information content of room-temperature fluorescence spectra for the analysis of PAHs with MM 302 in the Standard Reference Material (SRM) 1597a. Fluorescence spectra were recorded under stop-flow conditions with the aid of a commercial HPLC system. Of the 21 MM 302 PAHs known to be present in the SRM 1597a, 20 were tentatively identified based on retention times and the presence of 18 was confirmed based on excitation and emission spectral profiles.
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Affiliation(s)
- Hugh V. Hayes
- Department of Chemistry, University of Central Florida, Orlando, Florida 32816
| | - Walter B. Wilson
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
| | - Lane C. Sander
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
| | - Stephen A. Wise
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
| | - Andres D. Campiglia
- Department of Chemistry, University of Central Florida, Orlando, Florida 32816
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Tai SSC, Nelson MA, Bedner M, Lang BE, Phinney KW, Sander LC, Yen JH, Betz JM, Sempos CT, Wise SA. Development of Standard Reference Material (SRM) 2973 Vitamin D Metabolites in Frozen Human Serum (High Level). J AOAC Int 2017; 100:1294-1303. [PMID: 28917261 DOI: 10.5740/jaoacint.17-0182] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The National Institute of Standards and Technology (NIST), in collaboration with the National Institutes of Health Office of Dietary Supplements and the Vitamin D Standardization Program, has recently issued a new serum-matrix Standard Reference Material (SRM): 2973 Vitamin D Metabolites in Frozen Human Serum (High Level). SRM 2973 was designed to provide a serum material with a total 25-hydroxyvitamin D [25(OH)D] concentration near 100 nmol/L to complement the existing serum-based SRMs with values assigned for total 25(OH)D between 20 and 80 nmol/L. Values were assigned for 25-hydroxyvitamin D2 [25(OH)D2], 25-hydroxyvitamin D3 [25(OH)D3], 3-epi-25(OH)D3, and total 25(OH)D [the sum of 25(OH)D2 + 25(OH)D3] using the NIST isotope dilution LC with tandem MS (MS/MS) reference measurement procedure (RMP) and related methods. SRM 2973 has a certified value of 98.4 ± 2.1 nmol/L for 25(OH)D3 and reference values of 1.59 ± 0.05 nmol/L for 25(OH)D2 and 5.23 ± 0.20 nmol/L for 3-epi-25(OH)D3. In addition, a candidate RMP for 24R,25-dihydroxyvitamin D3 [24R,25(OH)2D3] based on LC-MS/MS was used to assign values to SRM 2973 and the existing SRM 972a Vitamin D Metabolites in Frozen Human Serum. Reference values for 24R,25(OH)2D3 were assigned to SRM 2973 (7.51 ± 0.26 nmol/L) and the four levels of SRM 972a: Level 1 (6.38 ± 0.23 nmol/L), Level 2 (3.39 ± 0.12 nmol/L), Level 3 (3.88 ± 0.013 nmol/L), and Level 4 (6.32 ± 0.22 nmol/L). The development of SRM 2973 [with a higher concentration of 25(OH)D3] and the addition of values for 24R,25(OH)2D3 assigned to both SRM 972a and SRM 2973 provide laboratories involved in vitamin D measurements with improved QA tools.
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Affiliation(s)
- Susan S-C Tai
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD 20899
| | - Michael A Nelson
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD 20899
| | - Mary Bedner
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD 20899
| | - Brian E Lang
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD 20899
| | - Karen W Phinney
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD 20899
| | - Lane C Sander
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD 20899
| | - James H Yen
- National Institute of Standards and Technology, Statistical Engineering Division, Gaithersburg, MD 20899
| | - Joseph M Betz
- National Institutes of Health, Office of Dietary Supplements, Bethesda, MD 20892
| | - Christopher T Sempos
- National Institutes of Health, Office of Dietary Supplements, Bethesda, MD 20892
| | - Stephen A Wise
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD 20899
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Wilson WB, Hayes HV, Sander LC, Campiglia AD, Wise SA. Normal-phase liquid chromatography retention behavior of polycyclic aromatic sulfur heterocycles and alkyl-substituted polycyclic aromatic sulfur heterocycle isomers on an aminopropyl stationary phase. Anal Bioanal Chem 2017; 410:1511-1524. [PMID: 29238863 DOI: 10.1007/s00216-017-0795-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [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: 10/18/2017] [Revised: 11/17/2017] [Accepted: 11/29/2017] [Indexed: 11/28/2022]
Abstract
Retention indices for 67 polycyclic aromatic sulfur heterocycles (PASHs) and 80 alkyl-substituted PASHs were determined using normal-phase liquid chromatography (NPLC) on an aminopropyl (NH2) stationary phase. The retention behavior of PASH on the NH2 phase is correlated with the number of aromatic carbon atoms and two structural characteristics have a significant influence on their retention: non-planarity (thickness, T) and the position of the sulfur atom in the bay-region of the structure. Correlations between solute retention on the NH2 phase and T of PASHs were investigated for three cata-condensed (cata-) PASH isomer groups: (a) 13 four-ring molecular mass (MM) 234 Da cata-PASHs, (b) 20 five-ring MM 284 Da cata-PASHs, and (c) 12 six-ring MM 334 Da cata-PASHs. Correlation coefficients ranged from r = -0.49 (MM 234 Da) to r = -0.65 (MM 334 Da), which were significantly lower than structurally similar PAH isomer groups (r = -0.70 to r = -0.99). The NPLC retention behavior of the PASHs are compared to similar results for PAHs.
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Affiliation(s)
- Walter B Wilson
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Mail Stop 8390, Gaithersburg, MD, 20899, USA.
| | - Hugh V Hayes
- Department of Chemistry, University of Central Florida, Physical Sciences Bld. 4111, Orlando, FL, 32816, USA
| | - Lane C Sander
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Mail Stop 8390, Gaithersburg, MD, 20899, USA
| | - Andres D Campiglia
- Department of Chemistry, University of Central Florida, Physical Sciences Bld. 4111, Orlando, FL, 32816, USA
| | - Stephen A Wise
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Mail Stop 8390, Gaithersburg, MD, 20899, USA
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Cui H, Garrigues P, Gauglitz G, Hilder E, Hopfgartner G, Muddiman DC, Roda A, Sanz-Medel A, Wise SA, Woolley AT, Zhang L. The scope of Analytical and Bioanalytical Chemistry (ABC). Anal Bioanal Chem 2017; 410:649-650. [PMID: 29167931 DOI: 10.1007/s00216-017-0743-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- H Cui
- Analytical and Bioanalytical Chemistry, Springer, Tiergartenstraße 17, 69121, Heidelberg, Germany
| | - P Garrigues
- Analytical and Bioanalytical Chemistry, Springer, Tiergartenstraße 17, 69121, Heidelberg, Germany
| | - G Gauglitz
- Analytical and Bioanalytical Chemistry, Springer, Tiergartenstraße 17, 69121, Heidelberg, Germany
| | - E Hilder
- Analytical and Bioanalytical Chemistry, Springer, Tiergartenstraße 17, 69121, Heidelberg, Germany.
| | - G Hopfgartner
- Analytical and Bioanalytical Chemistry, Springer, Tiergartenstraße 17, 69121, Heidelberg, Germany
| | - D C Muddiman
- Analytical and Bioanalytical Chemistry, Springer, Tiergartenstraße 17, 69121, Heidelberg, Germany
| | - A Roda
- Analytical and Bioanalytical Chemistry, Springer, Tiergartenstraße 17, 69121, Heidelberg, Germany
| | - A Sanz-Medel
- Analytical and Bioanalytical Chemistry, Springer, Tiergartenstraße 17, 69121, Heidelberg, Germany
| | - S A Wise
- Analytical and Bioanalytical Chemistry, Springer, Tiergartenstraße 17, 69121, Heidelberg, Germany
| | - A T Woolley
- Analytical and Bioanalytical Chemistry, Springer, Tiergartenstraße 17, 69121, Heidelberg, Germany
| | - L Zhang
- Analytical and Bioanalytical Chemistry, Springer, Tiergartenstraße 17, 69121, Heidelberg, Germany
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Sander LC, Pritchett JS, Daniels YC, Wood LJ, Lang BE, Wise SA, Yen JH, Johnson TL, Walters MJ, Phillips T, Holman MR, Lee GE, Lisko JG, Lane B, Valentin-Blasini L, Watson C. Development of a Cigarette Tobacco Filler Standard Reference Material. Anal Chem 2017; 89:10461-10467. [PMID: 28930436 DOI: 10.1021/acs.analchem.7b02550] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new tobacco filler Standard Reference Material (SRM) has been issued by the National Institute of Standards and Technology (NIST) in September 2016 with certified and reference mass fraction values for nicotine, N-nitrosonornicotine, 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone, and volatiles. The constituents have been determined by multiple analytical methods with measurements at NIST and at the Centers for Disease Control and Prevention, and with confirmatory measurements by commercial laboratories. This effort highlights the development of the first SRM for reduced nicotine and reduced tobacco-specific nitrosamines with certified values for composition.
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Affiliation(s)
- Lane C Sander
- National Institute of Standards and Technology (NIST) , Chemical Sciences Division, 100 Bureau Drive, MS 8392, Gaithersburg, Maryland 20899-8392, United States
| | - Jeanita S Pritchett
- National Institute of Standards and Technology (NIST) , Chemical Sciences Division, 100 Bureau Drive, MS 8392, Gaithersburg, Maryland 20899-8392, United States
| | - Yasmine C Daniels
- National Institute of Standards and Technology (NIST) , Chemical Sciences Division, 100 Bureau Drive, MS 8392, Gaithersburg, Maryland 20899-8392, United States
| | - Laura J Wood
- National Institute of Standards and Technology (NIST) , Chemical Sciences Division, 100 Bureau Drive, MS 8392, Gaithersburg, Maryland 20899-8392, United States
| | - Brian E Lang
- National Institute of Standards and Technology (NIST) , Chemical Sciences Division, 100 Bureau Drive, MS 8392, Gaithersburg, Maryland 20899-8392, United States
| | - Stephen A Wise
- National Institute of Standards and Technology (NIST) , Chemical Sciences Division, 100 Bureau Drive, MS 8392, Gaithersburg, Maryland 20899-8392, United States
| | - James H Yen
- NIST , Statistical Engineering Division, 100 Bureau Drive, MS 8980, Gaithersburg, Maryland 20899-8980, United States
| | - Tricia L Johnson
- Center for Tobacco Products, U.S. Food and Drug Administration , 10903 New Hampshire Avenue, Silver Spring, Maryland 20993, United States
| | - Matthew J Walters
- Center for Tobacco Products, U.S. Food and Drug Administration , 10903 New Hampshire Avenue, Silver Spring, Maryland 20993, United States
| | - Tracy Phillips
- Center for Tobacco Products, U.S. Food and Drug Administration , 10903 New Hampshire Avenue, Silver Spring, Maryland 20993, United States
| | - Matthew R Holman
- Center for Tobacco Products, U.S. Food and Drug Administration , 10903 New Hampshire Avenue, Silver Spring, Maryland 20993, United States
| | - Grace E Lee
- Centers for Disease Control and Prevention , Tobacco Products Laboratory, 4770 Buford Highway, Atlanta, Georgia 30341, United States
| | - Joseph G Lisko
- Centers for Disease Control and Prevention , Tobacco Products Laboratory, 4770 Buford Highway, Atlanta, Georgia 30341, United States
| | - Brian Lane
- Centers for Disease Control and Prevention , Tobacco Products Laboratory, 4770 Buford Highway, Atlanta, Georgia 30341, United States
| | - Liza Valentin-Blasini
- Centers for Disease Control and Prevention , Tobacco Products Laboratory, 4770 Buford Highway, Atlanta, Georgia 30341, United States
| | - Clifford Watson
- Centers for Disease Control and Prevention , Tobacco Products Laboratory, 4770 Buford Highway, Atlanta, Georgia 30341, United States
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Ramisetti SR, Oña-Ruales JO, Wise SA, Amin S, Sharma AK. An Efficient Synthesis of Dibenzo[a,l]tetracene and Dibenzo[a,j]tetracene and Their Identification in a Coal Tar Extract. Polycycl Aromat Compd 2017. [DOI: 10.1080/10406638.2017.1362013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Srinivasa R. Ramisetti
- Department of Pharmacology, Penn State Cancer Institute, Penn State College of Medicine, Hershey, Pennsylvania, USA
| | - Jorge O. Oña-Ruales
- National Institute of Standards and Technology (NIST), Gaithersburg, Maryland, USA
| | - Stephen A. Wise
- National Institute of Standards and Technology (NIST), Gaithersburg, Maryland, USA
| | - Shantu Amin
- Department of Pharmacology, Penn State Cancer Institute, Penn State College of Medicine, Hershey, Pennsylvania, USA
| | - Arun K. Sharma
- Department of Pharmacology, Penn State Cancer Institute, Penn State College of Medicine, Hershey, Pennsylvania, USA
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Phinney KW, Camara JE, Tai SSC, Sander LC, Wise SA, De Grande LAC, Thienpont LM, Possolo AM, Toman B, Sempos CT, Betz JM, Coates PM. Value Assignment of Vitamin D Metabolites in Vitamin D Standardization Program Serum Samples. J AOAC Int 2017; 100:1253-1259. [PMID: 28623654 PMCID: PMC5601309 DOI: 10.5740/jaoacint.17-0204] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Assay variability has been cited as an obstacle to establishing optimal vitamin D exposure. As part of the Vitamin D Standardization Program (VDSP) effort to standardize the measurement of total 25-hydroxyvitamin D [25(OH)D], the value assignment of total 25(OH)D in 50 single-donor serum samples was performed using two isotope-dilution LC with tandem MS methods. Both methods are recognized as reference measurement procedures (RMPs) by the Joint Committee for Traceability in Laboratory Medicine. These samples and their assigned values serve as the foundation for several aspects of the VDSP. To our knowledge, this is the first time that two RMPs have been used to assign 25(OH)D values to such a large number of serum samples.
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Affiliation(s)
- Karen W Phinney
- National Institute of Standards and Technology, Biomolecular Measurement Division and Chemical Sciences Division, Gaithersburg, MD 20899
| | - Johanna E Camara
- National Institute of Standards and Technology, Biomolecular Measurement Division and Chemical Sciences Division, Gaithersburg, MD 20899
| | - Susan S-C Tai
- National Institute of Standards and Technology, Biomolecular Measurement Division and Chemical Sciences Division, Gaithersburg, MD 20899
| | - Lane C Sander
- National Institute of Standards and Technology, Biomolecular Measurement Division and Chemical Sciences Division, Gaithersburg, MD 20899
| | - Stephen A Wise
- National Institute of Standards and Technology, Biomolecular Measurement Division and Chemical Sciences Division, Gaithersburg, MD 20899
| | - Linde A C De Grande
- Ghent University, Faculty of Pharmaceutical Sciences, Laboratory for Analytical Chemistry, Ghent, Belgium
| | - Linda M Thienpont
- Ghent University, Faculty of Pharmaceutical Sciences, Laboratory for Analytical Chemistry, Ghent, Belgium
| | - Antonio M Possolo
- National Institute of Standards and Technology, Statistical Engineering Division, Gaithersburg, MD 20899
| | - Blaza Toman
- National Institute of Standards and Technology, Statistical Engineering Division, Gaithersburg, MD 20899
| | - Christopher T Sempos
- National Institutes of Health, Office of Dietary Supplements, Bethesda, MD 20892
| | - Joseph M Betz
- National Institutes of Health, Office of Dietary Supplements, Bethesda, MD 20892
| | - Paul M Coates
- National Institutes of Health, Office of Dietary Supplements, Bethesda, MD 20892
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Wise SA, Tai SSC, Burdette CQ, Camara JE, Bedner M, Lippa KA, Nelson MA, Nalin F, Phinney KW, Sander LC, Betz JM, Sempos CT, Coates PM. Role of the National Institute of Standards and Technology (NIST) in Support of the Vitamin D Initiative of the National Institutes of Health, Office of Dietary Supplements. J AOAC Int 2017; 100:1260-1276. [PMID: 28863788 DOI: 10.5740/jaoacint.17-0305] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Since 2005, the National Institute of Standards and Technology (NIST) has collaborated with the National Institutes of Health (NIH), Office of Dietary Supplements (ODS) to improve the quality of measurements related to human nutritional markers of vitamin D status. In support of the NIH-ODS Vitamin D Initiative, including the Vitamin D Standardization Program (VDSP), NIST efforts have focused on (1) development of validated analytical methods, including reference measurement procedures (RMPs); (2) development of Standard Reference Materials (SRMs); (3) value assignment of critical study samples using NIST RMPs; and (4) development and coordination of laboratory measurement QA programs. As a result of this collaboration, NIST has developed RMPs for 25-hydroxyvitamin D2 [25(OH)D2], 25(OH)D3, and 24R,25-dihydroxyvitamin D3 [24R,25(OH)2D3]; disseminated serum-based SRMs with values assigned for 25(OH)D2, 25(OH)D3, 3-epi-25(OH)D3, and 24R,25(OH)2D3; assigned values for critical samples for VDSP studies, including an extensive interlaboratory comparison and reference material commutability study; provided an accuracy basis for the Vitamin D External Quality Assurance Scheme; coordinated the first accuracy-based measurement QA program for the determination of 25(OH)D2, 25(OH)D3, and 3-epi-25(OH)D3 in human serum/plasma; and developed methods and SRMs for the determination of vitamin D and 25(OH)D in food and supplement matrix SRMs. The details of these activities and their benefit and impact to the NIH-ODS Vitamin D Initiative are described.
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Affiliation(s)
- Stephen A Wise
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD 20899
| | - Susan S-C Tai
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD 20899
| | - Carolyn Q Burdette
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD 20899
| | - Johanna E Camara
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD 20899
| | - Mary Bedner
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD 20899
| | - Katrice A Lippa
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD 20899
| | - Michael A Nelson
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD 20899
| | - Federica Nalin
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD 20899
| | - Karen W Phinney
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD 20899
| | - Lane C Sander
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD 20899
| | - Joseph M Betz
- National Institutes of Health, Office of Dietary Supplements, Bethesda, MD 20892
| | - Christopher T Sempos
- National Institutes of Health, Office of Dietary Supplements, Bethesda, MD 20892
| | - Paul M Coates
- National Institutes of Health, Office of Dietary Supplements, Bethesda, MD 20892
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Burdette CQ, Camara JE, Nalin F, Pritchett J, Sander LC, Carter GD, Jones J, Betz JM, Sempos CT, Wise SA. Establishing an Accuracy Basis for the Vitamin D External Quality Assessment Scheme (DEQAS). J AOAC Int 2017; 100:1277-1287. [PMID: 28847346 DOI: 10.5740/jaoacint.17-0306] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Until recently, the Vitamin D External Quality Assessment Scheme (DEQAS) assessed the performance of various assays for the determination of serum total 25-hydroxyvitamin D [25(OH)D] by using a consensus mean based on the all-laboratory trimmed mean (ALTM) of the approximately 1000 participants' results. Since October 2012, the National Institute of Standards and Technology (NIST), as part of the Vitamin D Standardization Program, has participated in DEQAS by analyzing the quarterly serum sample sets using an isotope dilution LC-tandem MS (ID LC-MS/MS) reference measurement procedure to assign an accuracy-based target value for serum total 25(OH)D. NIST has analyzed 90 DEQAS samples (18 exercises × 5 samples/exercise) to assign target values. The NIST-assigned values are compared with the ALTM and the biases assessed for various assays used by the participants, e.g., LC-MS/MS, HPLC, and several ligand-binding assays. The NIST-value assignment process and the results of the analyses of the 90 DEQAS samples are summarized. The absolute mean bias between the NIST-assigned values and the ALTM was 5.6%, with 10% of the samples having biases >10%. Benefits of the accuracy-based target values are presented, including for sample sets with high concentrations of 25(OH)D2 and 3-epi-25(OH)D3.
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Affiliation(s)
- Carolyn Q Burdette
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD 20899
| | - Johanna E Camara
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD 20899
| | - Federica Nalin
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD 20899
| | - Jeanita Pritchett
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD 20899
| | - Lane C Sander
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD 20899
| | - Graham D Carter
- Imperial College Healthcare, Department of Biochemistry, NHS Trust, Charing Cross Hospital, London, United Kingdom
| | - Julia Jones
- Imperial College Healthcare, Department of Biochemistry, NHS Trust, Charing Cross Hospital, London, United Kingdom
| | - Joseph M Betz
- National Institutes of Health, Office of Dietary Supplements, Bethesda, MD 20892
| | - Christopher T Sempos
- National Institutes of Health, Office of Dietary Supplements, Bethesda, MD 20892
| | - Stephen A Wise
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD 20899
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Phinney KW, Sempos CT, Tai SSC, Camara JE, Wise SA, Eckfeldt JH, Hoofnagle AN, Carter GD, Jones J, Myers GL, Durazo-Arvizu R, Miller WG, Bachmann LM, Young IS, Pettit J, Caldwell G, Liu A, Brooks SPJ, Sarafin K, Thamm M, Mensink GBM, Busch M, Rabenberg M, Cashman KD, Kiely M, Galvin K, Zhang JY, Kinsella M, Oh K, Lee SW, Jung CL, Cox L, Goldberg G, Guberg K, Meadows S, Prentice A, Tian L, Brannon PM, Lucas RM, Crump PM, Cavalier E, Merkel J, Betz JM. Baseline Assessment of 25-Hydroxyvitamin D Reference Material and Proficiency Testing/External Quality Assurance Material Commutability: A Vitamin D Standardization Program Study. J AOAC Int 2017; 100:1288-1293. [PMID: 28797319 DOI: 10.5740/jaoacint.17-0291] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The Vitamin D Standardization Program (VDSP) coordinated a study in 2012 to assess the commutability of reference materials and proficiency testing/external quality assurance materials for total 25-hydroxyvitamin D [25(OH)D] in human serum, the primary indicator of vitamin D status. A set of 50 single-donor serum samples as well as 17 reference and proficiency testing/external quality assessment materials were analyzed by participating laboratories that used either immunoassay or LC-MS methods for total 25(OH)D. The commutability test materials included National Institute of Standards and Technology Standard Reference Material 972a Vitamin D Metabolites in Human Serum as well as materials from the College of American Pathologists and the Vitamin D External Quality Assessment Scheme. Study protocols and data analysis procedures were in accordance with Clinical and Laboratory Standards Institute guidelines. The majority of the test materials were found to be commutable with the methods used in this commutability study. These results provide guidance for laboratories needing to choose appropriate reference materials and select proficiency or external quality assessment programs and will serve as a foundation for additional VDSP studies.
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Affiliation(s)
- Karen W Phinney
- National Institute of Standards and Technology, Biomolecular Measurement Division, Gaithersburg, MD
| | | | - Susan S-C Tai
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD
| | - Johanna E Camara
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD
| | - Stephen A Wise
- National Institutes of Health, Office of Dietary Supplements, Bethesda, MD
| | - John H Eckfeldt
- University of Minnesota, Department of Laboratory Medicine and Pathology, Minneapolis, MN
| | - Andrew N Hoofnagle
- University of Washington, Department of Laboratory Medicine, Seattle, WA
| | - Graham D Carter
- Vitamin D External Quality Assessment Scheme, Charing Cross Hospital, London, United Kingdom
| | - Julia Jones
- Vitamin D External Quality Assessment Scheme, Charing Cross Hospital, London, United Kingdom
| | - Gary L Myers
- Joint Committee for Traceability in Laboratory Medicine, Smyrna, GA
| | | | | | | | | | - Juanita Pettit
- Health Surveys, Australian Bureau of Statistics, Canberra, ACT, Australia
| | - Grahame Caldwell
- Douglass Hanly Moir Pathology, Sonic Healthcare, Sydney, NSW, Australia
| | - Andrew Liu
- Douglass Hanly Moir Pathology, Sonic Healthcare, Sydney, NSW, Australia
| | | | - Kurtis Sarafin
- Health Canada, Nutrition Research Division, Ottawa, ON, Canada
| | | | | | | | | | - Kevin D Cashman
- University College Cork, School of Food and Nutritional Sciences, Cork Centre for Vitamin D and Nutrition Research, Cork, Ireland
| | - Mairead Kiely
- University College Cork, School of Food and Nutritional Sciences, Cork Centre for Vitamin D and Nutrition Research, Cork, Ireland
| | - Karen Galvin
- University College Cork, School of Food and Nutritional Sciences, Cork Centre for Vitamin D and Nutrition Research, Cork, Ireland
| | - Joy Y Zhang
- University College Cork, School of Food and Nutritional Sciences, Cork Centre for Vitamin D and Nutrition Research, Cork, Ireland
| | - Michael Kinsella
- University College Cork, School of Food and Nutritional Sciences, Cork Centre for Vitamin D and Nutrition Research, Cork, Ireland
| | - Kyungwon Oh
- Korea Centers for Disease Control and Prevention, Division of Health and Nutrition Survey, Seoul, Korea
| | | | | | - Lorna Cox
- Medical Research Council Elsie Widdowson Laboratory, Cambridge, United Kingdom
| | - Gail Goldberg
- Medical Research Council Elsie Widdowson Laboratory, Cambridge, United Kingdom
| | - Kate Guberg
- Medical Research Council Elsie Widdowson Laboratory, Cambridge, United Kingdom
| | - Sarah Meadows
- Medical Research Council Elsie Widdowson Laboratory, Cambridge, United Kingdom
| | - Ann Prentice
- Medical Research Council Elsie Widdowson Laboratory, Cambridge, United Kingdom
| | - Lu Tian
- Stanford University, Department of Biomedical Data Science, Palo Alto, CA
| | - Patsy M Brannon
- Cornell University, Division of Nutritional Sciences, Ithaca, NY
| | - Robyn M Lucas
- Australian National University, Research School of Population Health, National Centre for Epidemiology and Population Health, Canberra, ACT, Australia
| | - Peter M Crump
- University Computing and Biometry, of Wisconsin-Madison, Madison, WI
| | - Etienne Cavalier
- University of Liege, Centre Hospitalier Universitaire du Sart-Tilman, Liege, Belgium
| | - Joyce Merkel
- Office of Dietary Supplements, National Institutes of Health, Bethesda, MD 20892
| | - Joseph M Betz
- Office of Dietary Supplements, National Institutes of Health, Bethesda, MD 20892
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Sempos CT, Betz JM, Camara JE, Carter GD, Cavalier E, Clarke MW, Dowling KG, Durazo-Arvizu RA, Hoofnagle AN, Liu A, Phinney KW, Sarafin K, Wise SA, Coates PM. General Steps to Standardize the Laboratory Measurement of Serum Total 25-Hydroxyvitamin D. J AOAC Int 2017; 100:1230-1233. [PMID: 28766476 DOI: 10.5740/jaoacint.17-0259] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The Vitamin D Standardization Program (VDSP) has collaborated with numerous groups and agencies to assemble a set of tools, i.e., a reference measurement system, that can be used to establish the traceability of 25-hydroxyvitamin D [25(OH)D] assays to relevant reference measurement procedures and reference materials. This is done with the goal of verifying end-user laboratory performance using precise statistical criteria to determine whether a specific assay is standardized. The purpose of this paper was to outline a set of steps that routine clinical and research laboratories can use to standardize their 25(OH)D assays using these tools. These steps apply to laboratories using commercially developed immunoassay measurement systems as well as in-house assays, usually based on high HPLC or LC tandem MS measurement systems. The steps are (1) initial calibration, (2) initial assessment of accuracy and bias, (3) assessment of total percent CV and mean bias, (4) use of trueness controls, and (5) participation in accuracy-based performance testing and/or external quality assessment schemes. The goal of each laboratory assay is to have a total CV of ≤10% and mean bias of ≤5%. Rigorous and less rigorous but low-cost options for meeting these statistical criteria are provided. Research laboratories who infrequently measure 25(OH)D are advised to repeat steps 1-4 for every measurement cycle. For users of commercial immunoassays who have relatively little control over standardization, we present an option for using trueness controls to develop a master equation that can be used to standardize results to the reference methods.
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Affiliation(s)
| | - Joseph M Betz
- National Institutes of Health, Office of Dietary Supplements, Bethesda, MD
| | - Johanna E Camara
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD
| | - Graham D Carter
- Imperial College Healthcare NHS Trust, London, United Kingdom
| | - Etienne Cavalier
- University of Liège, Centre Hospitalier Universitaire de Liège, Department of Clinical Chemistry, Liège, Belgium
| | - Michael W Clarke
- The University of Western Australia, Centre for Microscopy, Characterisation and Analysis, Perth, WA, 6009 Australia
| | - Kirsten G Dowling
- University College Cork, School of Food and Nutritional Sciences, Cork Centre for Vitamin D and Nutrition Research, Cork, Ireland
| | | | - Andrew N Hoofnagle
- University of Washington, Department of Laboratory Medicine, Seattle, WA
| | - Andy Liu
- Sonic Healthcare, Douglass Hanly Moir Pathology, Sydney, NSW, Australia
| | - Karen W Phinney
- National Institute of Standards and Technology, Biomolecular Measurement Division, Gaithersburg, MD
| | - Kurtis Sarafin
- Health Canada, Nutrition Research Division, Ottawa, ON, Canada
| | - Stephen A Wise
- National Institutes of Health, Office of Dietary Supplements, Bethesda, MD
| | - Paul M Coates
- National Institutes of Health, Office of Dietary Supplements, Bethesda, MD
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Wise SA, Tai SSC, Nelson MA, Burdette CQ, Camara JE, Hoofnagle AN, Laha TJ, Carter GD, Jones J, Williams EL, Barclay ZJ, Jones G, Kaufmann M, Binkley N, Kapoor A, Ziegler T, Cashman KD, Dowling KG, Sempos CT. Interlaboratory Comparison for the Determination of 24,25-Dihydroxyvitamin D₃ in Human Serum Using Liquid Chromatography with Tandem Mass Spectrometry. J AOAC Int 2017; 100:1308-1317. [PMID: 28741469 DOI: 10.5740/jaoacint.17-0183] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Six laboratories associated with the Vitamin D Standardization Program (VDSP) participated in an interlaboratory comparison of LC with tandem MS (MS/MS) methods for the determination of 24,25-dihydroxyvitamin D3 [24,25(OH)2D3] in human serum. The laboratories analyzed two different serum-based Standard Reference Materials (SRMs) intended for use in the determination of 25-hydroxyvitamin D and 30 samples from the Vitamin D External Quality Assessment Scheme (DEQAS). All laboratory methods for 24,25(OH)2D3 were based on isotope dilution LC-MS/MS; three of the methods used derivatization of the vitamin D metabolites before LC-MS/MS. Laboratory results were compared to the National Institute of Standards and Technology (NIST) results, which were obtained using their newly developed candidate reference measurement procedure for 24,25(OH)2D3. Laboratory results for the SRM samples varied in comparability to the NIST results, with one laboratory in excellent agreement (-1.6% mean bias), three laboratories at 10-15% mean bias, and the remaining laboratory at 36% mean bias. For the 30 DEQAS samples, the mean bias for the five laboratories ranged from 6 to 15%; however, the SD of the bias ranged from 8 to 29%. As a result of this intercomparison study, one laboratory discovered and corrected a method calculation error and another laboratory modified and improved their LC-MS/MS method.
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Affiliation(s)
- Stephen A Wise
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD 20899
| | - Susan S-C Tai
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD 20899
| | - Michael A Nelson
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD 20899
| | - Carolyn Q Burdette
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD 20899
| | - Johanna E Camara
- National Institute of Standards and Technology, Chemical Sciences Division, Gaithersburg, MD 20899
| | - Andrew N Hoofnagle
- University of Washington, Department of Laboratory Medicine, Seattle, WA 98195-7110
| | - Thomas J Laha
- University of Washington, Department of Laboratory Medicine, Seattle, WA 98195-7110
| | - Graham D Carter
- Imperial College Healthcare National Health Service Trust, Charing Cross Hospital, Department of Biochemistry, London, United Kingdom
| | - Julia Jones
- Imperial College Healthcare National Health Service Trust, Charing Cross Hospital, Department of Biochemistry, London, United Kingdom
| | - Emma L Williams
- Imperial College Healthcare National Health Service Trust, Charing Cross Hospital, Department of Biochemistry, London, United Kingdom
| | - Zoe J Barclay
- Imperial College Healthcare National Health Service Trust, Charing Cross Hospital, Department of Biochemistry, London, United Kingdom
| | | | | | - Neil Binkley
- University of Wisconsin-Madison, Madison, WI 53706
| | - Amita Kapoor
- University of Wisconsin-Madison, Madison, WI 53706
| | - Toni Ziegler
- University of Wisconsin-Madison, Madison, WI 53706
| | - Kevin D Cashman
- University College Cork, School of Food and Nutritional Sciences, Cork Centre for Vitamin D and Nutrition Research, Cork, Ireland
| | - Kirsten G Dowling
- University College Cork, School of Food and Nutritional Sciences, Cork Centre for Vitamin D and Nutrition Research, Cork, Ireland
| | - Christopher T Sempos
- National Institutes of Health, Office of Dietary Supplements, Bethesda, MD 20892
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Wilson WB, Hayes HV, Sander LC, Campiglia AD, Wise SA. Normal-phase liquid chromatography retention behavior of polycyclic aromatic hydrocarbon and their methyl-substituted derivatives on an aminopropyl stationary phase. Anal Bioanal Chem 2017; 409:5291-5305. [PMID: 28717893 DOI: 10.1007/s00216-017-0474-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Revised: 05/30/2017] [Accepted: 06/16/2017] [Indexed: 11/30/2022]
Abstract
Retention indices for 124 polycyclic aromatic hydrocarbons (PAHs) and 62 methyl-substituted (Me-) PAHs were determined using normal-phase liquid chromatography (NPLC) on a aminopropyl (NH2) stationary phase. PAH retention behavior on the NH2 phase is correlated to the total number of aromatic carbons in the PAH structure. Within an isomer group, non-planar isomers generally elute earlier than planar isomers. MePAHs generally elute slightly later but in the same region as the parent PAHs. Correlations between PAH retention behavior on the NH2 phase and PAH thickness (T) values were investigated to determine the influence of non-planarity for isomeric PAHs with four to seven aromatic rings. Correlation coefficients ranged from r = 0.19 (five-ring peri-condensed molecular mass (MM) 252 Da) to r = -0.99 (five-ring cata-condensed MM 278 Da). In the case of the smaller PAHs (MM ≤ 252 Da), most of the PAHs had a planar structure and provided a low correlation. In the case of larger PAHs (MM ≥ 278 Da), nonplanarity had a significant influence on the retention behavior and good correlation between retention and T was obtained for the MM 278 Da, MM 302 Da, MM 328 Da, and MM 378 Da isomer sets. Graphical abstract NPLC separation of the three-, four-, five-, and six-ring PAH isomers with different number of aromatic carbon atoms and degrees of non-planarity (Thickness, T). The inserted figure plots the number of aromatic carbon atoms vs. the log I value for the 124 parent PAHs.
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Affiliation(s)
- Walter B Wilson
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Mail Stop 8390, Gaithersburg, MD, 20899, USA.
| | - Hugh V Hayes
- Department of Chemistry, University of Central Florida, Orlando, FL, 32816, USA
| | - Lane C Sander
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Mail Stop 8390, Gaithersburg, MD, 20899, USA
| | - Andres D Campiglia
- Department of Chemistry, University of Central Florida, Orlando, FL, 32816, USA
| | - Stephen A Wise
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Mail Stop 8390, Gaithersburg, MD, 20899, USA
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Wilson WB, Hayes HV, Sander LC, Campiglia AD, Wise SA. Qualitative characterization of SRM 1597a coal tar for polycyclic aromatic hydrocarbons and methyl-substituted derivatives via normal-phase liquid chromatography and gas chromatography/mass spectrometry. Anal Bioanal Chem 2017; 409:5171-5183. [PMID: 28664340 DOI: 10.1007/s00216-017-0464-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [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: 04/03/2017] [Revised: 05/31/2017] [Accepted: 06/09/2017] [Indexed: 11/29/2022]
Abstract
A normal-phase liquid chromatography (NPLC) fractionation procedure was developed for the characterization of a complex mixture of polycyclic aromatic hydrocarbons (PAHs) from a coal tar sample (Standard Reference Material (SRM) 1597a). Using a semi-preparative aminopropyl (NH2) LC column, the coal tar sample was separated using NPLC based on the number of aromatic carbons; a total of 14 NPLC fractions were collected. SRM 1597a was analyzed before and after NPLC fractionation by using gas chromatography/mass spectrometry (GC/MS) with a 50% phenyl stationary phase. The NPLC-GC/MS method presented in this study allowed for the identification of 72 PAHs and 56 MePAHs. These identifications were based on the NPLC retention times for authentic reference standards, GC retention times for authentic reference standards, and the predominant molecular ion peak in the mass spectrum. Most noteworthy was the determination of dibenzo[a,l]pyrene, which could not be measured directly by GC/MS because of low concentration and co-elution with dibenzo[j,l]fluoranthene. The NPLC-GC/MS procedure also allowed for the tentative identification of 74 PAHs and 117 MePAHs based on the molecular ion peak only. This study represents the most comprehensive qualitative characterization of SRM 1597a to date. Graphical abstract NPLC-GC/MS analysis for the six-ring MM 302 Da PAH isomers in SRM 1597a.
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Affiliation(s)
- Walter B Wilson
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Mail Stop 8390, Gaithersburg, MD, 20899, USA.
| | - Hugh V Hayes
- Department of Chemistry, University of Central Florida, Orlando, FL, 32816, USA
| | - Lane C Sander
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Mail Stop 8390, Gaithersburg, MD, 20899, USA
| | - Andres D Campiglia
- Department of Chemistry, University of Central Florida, Orlando, FL, 32816, USA
| | - Stephen A Wise
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Mail Stop 8390, Gaithersburg, MD, 20899, USA
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Phinney KW, Tai SSC, Bedner M, Camara JE, Chia RR, Sander LC, Sharpless KE, Wise SA, Yen JH, Schleicher RL, Chaudhary-Webb M, Maw KL, Rahmani Y, Betz JM, Merkel J, Sempos CT, Coates PM, Durazo-Arvizu RA, Sarafin K, Brooks SP. Development of an Improved Standard Reference Material for Vitamin D Metabolites in Human Serum. Anal Chem 2017; 89:4907-4913. [PMID: 28375002 PMCID: PMC5575745 DOI: 10.1021/acs.analchem.6b05168] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The National Institute of Standards and Technology (NIST) has developed Standard Reference Material (SRM) 972a Vitamin D Metabolites in Frozen Human Serum as a replacement for SRM 972, which is no longer available. SRM 972a was developed in collaboration with the National Institutes of Health's Office of Dietary Supplements. In contrast to the previous reference material, three of the four levels of SRM 972a are composed of unmodified human serum. This SRM has certified and reference values for the following 25-hydroxyvitamin D [25(OH)D] species: 25(OH)D2, 25(OH)D3, and 3-epi-25(OH)D3. The value assignment and certification process included three isotope-dilution mass spectrometry approaches, with measurements performed at NIST and at the Centers for Disease Control and Prevention (CDC). The value assignment methods employed have been modified from those utilized for the previous SRM, and all three approaches now incorporate chromatographic resolution of the stereoisomers, 25(OH)D3 and 3-epi-25(OH)D3.
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Affiliation(s)
- Karen W. Phinney
- Biomolecular Measurement Division and Chemical Sciences Division, National Institute of Standards and Technology, Gaithersburg, MD 20899
| | - Susan S.-C. Tai
- Biomolecular Measurement Division and Chemical Sciences Division, National Institute of Standards and Technology, Gaithersburg, MD 20899
| | - Mary Bedner
- Biomolecular Measurement Division and Chemical Sciences Division, National Institute of Standards and Technology, Gaithersburg, MD 20899
| | - Johanna E. Camara
- Biomolecular Measurement Division and Chemical Sciences Division, National Institute of Standards and Technology, Gaithersburg, MD 20899
| | - Rosalind R.C. Chia
- Biomolecular Measurement Division and Chemical Sciences Division, National Institute of Standards and Technology, Gaithersburg, MD 20899
| | - Lane C. Sander
- Biomolecular Measurement Division and Chemical Sciences Division, National Institute of Standards and Technology, Gaithersburg, MD 20899
| | - Katherine E. Sharpless
- Biomolecular Measurement Division and Chemical Sciences Division, National Institute of Standards and Technology, Gaithersburg, MD 20899
| | - Stephen A. Wise
- Biomolecular Measurement Division and Chemical Sciences Division, National Institute of Standards and Technology, Gaithersburg, MD 20899
| | - James H. Yen
- Statistical Engineering Division, National Institute of Standards and Technology Gaithersburg, MD 20899
| | - Rosemary L. Schleicher
- Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA 30341
| | - Madhulika Chaudhary-Webb
- Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA 30341
| | - Khin L. Maw
- Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA 30341
| | - Yasamin Rahmani
- Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA 30341
| | - Joseph M. Betz
- Office of Dietary Supplements, National Institutes of Health, Bethesda, MD 20892
| | - Joyce Merkel
- Office of Dietary Supplements, National Institutes of Health, Bethesda, MD 20892
| | | | - Paul M. Coates
- Office of Dietary Supplements, National Institutes of Health, Bethesda, MD 20892
| | - Ramón A. Durazo-Arvizu
- Department of Public Health Sciences, Stritch School of Medicine, Loyola University Chicago, Maywood, IL 60153
| | - Kurtis Sarafin
- Bureau of Nutritional Sciences, Health Canada, Ottawa, Ontario, Canada K1A 0K9
| | - Stephen P.J. Brooks
- Bureau of Nutritional Sciences, Health Canada, Ottawa, Ontario, Canada K1A 0K9
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47
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Wilson WB, Sander LC, Oña-Ruales JO, Mössner SG, Sidisky LM, Lee ML, Wise SA. Retention behavior of alkyl-substituted polycyclic aromatic sulfur heterocycle isomers in gas chromatography on stationary phases of different selectivity. J Chromatogr A 2017; 1484:73-84. [PMID: 28089274 DOI: 10.1016/j.chroma.2017.01.026] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [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: 11/23/2016] [Revised: 01/06/2017] [Accepted: 01/09/2017] [Indexed: 11/16/2022]
Abstract
Retention indices for 10 sets of alkyl-substituted polycyclic aromatic sulfur heterocycles (PASHs) isomers (total of 80 PASHs) were determined using gas chromatography with three different stationary phases: a 50% phenyl phase, a 50% liquid crystalline dimethylpolysiloxane (LC-DMPS) phase, and an ionic liquid (IL) phase. Correlations between the retention behavior on the three stationary phases and PASH geometry [length-to-breadth (L/B) and thickness (T)] were investigated for the following PASHs: 4 methyl-substituted dibenzothiophenes (DBTs), 3 ethyl-substituted DBTs, 15 dimethyl-substituted DBTs, 8 trimethyl-substituted DBTs, 15 methyl-substituted naphthothiophenes, 30 methyl-substituted benzonaphthothiophenes, and 5 methyl-substituted tetrapheno[1,12-bcd]thiophene. Correlation coefficients for retention on the 50% phenyl phase vs L/B ranged from r=-0.28 (MeBbN23Ts) to r=0.92 (EtDBTs). Correlation coefficients for retention on the IL phase vs L/B ranged from r=0.13 (MeN12Ts) to r=0.83 (EtDBTs). Correlation coefficients for retention on the 50% LC-DMPS phase vs L/B ranged from r=0.22 (MeDBTs) to r=0.84 (TriMeDBTs).
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Affiliation(s)
- Walter B Wilson
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, United States.
| | - Lane C Sander
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, United States
| | - Jorge O Oña-Ruales
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, United States
| | - Stephanie G Mössner
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, United States
| | - Leonard M Sidisky
- MilliporeSigma, A Business of Merck KGaA, Bellefonte, PA 16823, United States
| | - Milton L Lee
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602, United States
| | - Stephen A Wise
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, United States
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48
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Schantz MM, Powers CD, Schleicher RL, Betz JM, Wise SA. Interlaboratory analytical comparison of fatty acid concentrations in serum or plasma. Clin Chim Acta 2016; 462:148-152. [PMID: 27662814 DOI: 10.1016/j.cca.2016.09.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [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: 08/05/2016] [Revised: 08/24/2016] [Accepted: 09/19/2016] [Indexed: 01/11/2023]
Abstract
BACKGROUND There are a large number of clinical studies focusing on the measurement of individual fatty acids in serum or plasma; however, few studies have focused on the interlaboratory comparisons of these measurements. The National Institutes of Standards and Technology (NIST), in collaboration with the National Institutes of Health Office of Dietary Supplements (NIH-ODS) and the Centers for Disease Control and Prevention (CDC), has initiated a quality assurance program for assessing and improving the comparability of individual fatty acid measurements in serum and plasma. METHODS This is a performance-based study so participants are encouraged to use their laboratory's methods for the quantification of the individual fatty acids that they typically measure in the unknown serum or plasma samples along with a control material. The control materials used to date are SRM 1950 Metabolites in Human Plasma and SRM 2378 Fatty Acids in Frozen Human Serum. RESULTS To date, two studies of the Fatty Acid Quality Assurance Program (FAQAP) have been completed with 11 and 14 participants, respectively. The agreement among the laboratories for individual fatty acids was within 20% for 70% of the data submitted. Laboratories were also requested to run triplicate analyses for each unknown sample. The precision of the individual laboratory data was generally good, with relative standard deviations <20%. CONCLUSIONS The results from the first two exercises indicate the need for additional assessment of the comparability among laboratories doing these measurements. Future studies will be conducted with the goals of increasing the number of participating laboratories, increasing awareness of the need to use control materials, and improving the comparability among laboratories.
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Affiliation(s)
- Michele M Schantz
- Chemical Sciences Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
| | - Carissa D Powers
- Nutritional Biomarkers Branch/Division of Laboratory Sciences, Centers for Disease Control and Prevention, Atlanta, GA 30341, USA
| | - Rosemary L Schleicher
- Nutritional Biomarkers Branch/Division of Laboratory Sciences, Centers for Disease Control and Prevention, Atlanta, GA 30341, USA
| | - Joseph M Betz
- Office of Dietary Supplements, National Institutes of Health, Bethesda, MD 20892, USA
| | - Stephen A Wise
- Chemical Sciences Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA; Office of Dietary Supplements, National Institutes of Health, Bethesda, MD 20892, USA
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49
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Long SE, Catron BL, Boggs AS, Tai SS, Wise SA. Development of Standard Reference Materials to support assessment of iodine status for nutritional and public health purposes. Am J Clin Nutr 2016; 104 Suppl 3:902S-6S. [PMID: 27534629 PMCID: PMC5004495 DOI: 10.3945/ajcn.115.110361] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [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: 11/14/2022] Open
Abstract
The use of urinary iodine as an indicator of iodine status relies in part on the accuracy of the analytical measurement of iodine in urine. Likewise, the use of dietary iodine intake as an indicator of iodine status relies in part on the accuracy of the analytical measurement of iodine in dietary sources, including foods and dietary supplements. Similarly, the use of specific serum biomarkers of thyroid function to screen for both iodine deficiency and iodine excess relies in part on the accuracy of the analytical measurement of those biomarkers. The National Institute of Standards and Technology has been working with the NIH Office of Dietary Supplements for several years to develop higher-order reference measurement procedures and Standard Reference Materials to support the validation of new routine analytical methods for iodine in foods and dietary supplements, for urinary iodine, and for several serum biomarkers of thyroid function including thyroid-stimulating hormone, thyroglobulin, total and free thyroxine, and total and free triiodothyronine. These materials and methods have the potential to improve the assessment of iodine status and thyroid function in observational studies and clinical trials, thereby promoting public health efforts related to iodine nutrition.
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Affiliation(s)
- Stephen E Long
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, Charleston, SC, and
| | - Brittany L Catron
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, Charleston, SC, and
| | - Ashley Sp Boggs
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, Charleston, SC, and
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Wilson WB, Sander LC, de Alda ML, Lee ML, Wise SA. Retention behavior of isomeric polycyclic aromatic sulfur heterocycles in reversed-phase liquid chromatography. J Chromatogr A 2016; 1461:107-19. [PMID: 27481401 DOI: 10.1016/j.chroma.2016.07.064] [Citation(s) in RCA: 14] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2016] [Revised: 07/21/2016] [Accepted: 07/24/2016] [Indexed: 10/21/2022]
Abstract
Retention indices for 70 polycyclic aromatic sulfur heterocycles (PASHs) were determined using reversed-phase liquid chromatography (LC) on a monomeric and a polymeric C18 stationary phase. Molecular shape parameters [length, breadth, thickness (T), and length-to-breadth ratio (L/B)] were calculated for all the compounds studied. Correlations between the retention on the polymeric C18 phase and PASH geometry (L/B and T) were investigated for six specific PASH isomer groups with molecular mass (MM) 184Da, 234Da, 258Da, 284Da, 334Da, and 384Da. Similar to previous studies for polycyclic aromatic hydrocarbons (PAHs), PASH elution order on the polymeric C18 phase was generally found to follow increasing L/B values. Correlation coefficients for retention vs L/B ranged from r=0.45 (MM 184Da) to r=0.89 (MM 284Da). In the case of smaller PASHs (MM≤258Da), the location of the sulfur atom in the bay-region of the structure resulted in later than expected elution of these isomers based on L/B. In the case of the larger PASHs (MM≥284Da), nonplanarity had a significant influence on earlier than predicted elution based on L/B values.
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Affiliation(s)
- Walter B Wilson
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, United States.
| | - Lane C Sander
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, United States
| | - Miren Lopez de Alda
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, United States
| | - Milton L Lee
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602, United States
| | - Stephen A Wise
- Chemical Sciences Division, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, United States
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