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Yang C, Lambert P, Nguyen M, Yang Z, Hollebone BP, Fieldhouse B, Brown CE. Application of gas chromatography-high resolution quadrupole time-of-flight mass spectrometry in fingerprinting analysis of polycyclic aromatic sulfur heterocycles. J Chromatogr A 2020; 1630:461577. [PMID: 32980610 DOI: 10.1016/j.chroma.2020.461577] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 09/18/2020] [Accepted: 09/20/2020] [Indexed: 11/20/2022]
Abstract
Polycyclic aromatic sulfur heterocycles (PASHs), as a group of major sulfur-containing compounds, widely occur in crude oil and its refined products. Accurate analyses of these petrochemical components play an important role in monitoring oil quality, forensic source identification, and assessment of environmental impact of an oil spill. PASHs occur at relatively lower abundances in most crude oils and refined petroleum products than their corresponding aromatic hydrocarbons and are co-eluted together with some petroleum hydrocarbons in chromatographic analysis, resulting in high uncertainty for their quantitation. Capillary gas chromatography coupled with a quadrupole time-of-flight mass spectrometry (GC-QTOF-MS) provides high resolution and high mass accuracy, which facilitates discrimination of the delicate mass defects of isobaric compounds with the same nominal mass and external matrix material. In this work, GC-QTOF-MS was applied to analyze bicyclic to pentacyclic PASHs including benzothiophenes, dibenzothiophenes, benzonaphthothiophenes, dinaphthothiophenes and their C1- to C4- alkylated homologues in a number of crude oils, refined petroleum products, and environmental samples. GC-QTOF-MS analysis substantially improved the identification confidence and reduced quantitation uncertainty of PASHs and polycyclic aromatic hydrocarbons (PAHs) by eliminating the interferences presented in nominal mass chromatograms.
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Affiliation(s)
- Chun Yang
- Emergencies Science and Technology Section, Science and Technology Branch, Environment and Climate Change Canada, 335 River Road, Ottawa, ON, Canada.
| | - Patrick Lambert
- Emergencies Science and Technology Section, Science and Technology Branch, Environment and Climate Change Canada, 335 River Road, Ottawa, ON, Canada
| | - Monica Nguyen
- Emergencies Science and Technology Section, Science and Technology Branch, Environment and Climate Change Canada, 335 River Road, Ottawa, ON, Canada
| | - Zeyu Yang
- Emergencies Science and Technology Section, Science and Technology Branch, Environment and Climate Change Canada, 335 River Road, Ottawa, ON, Canada
| | - Bruce P Hollebone
- Emergencies Science and Technology Section, Science and Technology Branch, Environment and Climate Change Canada, 335 River Road, Ottawa, ON, Canada
| | - Ben Fieldhouse
- Emergencies Science and Technology Section, Science and Technology Branch, Environment and Climate Change Canada, 335 River Road, Ottawa, ON, Canada
| | - Carl E Brown
- Emergencies Science and Technology Section, Science and Technology Branch, Environment and Climate Change Canada, 335 River Road, Ottawa, ON, Canada
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2
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Wang J, Hang Y, Yan T, Liang J, Huang Z, Xu H. Qualitative analysis of flavors and fragrances added to tea by using GC-MS. J Sep Sci 2017; 41:648-656. [PMID: 29134791 DOI: 10.1002/jssc.201700916] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Revised: 10/30/2017] [Accepted: 11/05/2017] [Indexed: 01/09/2023]
Abstract
A precise identification method was developed to identify the flavors and fragrances added to tea matrix artificially using gas chromatography with mass spectrometry and gas chromatography with quadrupole time-of-flight mass spectrometry. The proposed method was based on the corresponding "three-column retention indices, two exact mass numbers, one mass spectrum matching degree" database of 40 kinds of common flavors and fragrances. The intraday and the interday relative standard deviation of the retention indices were less than 0.048 and 0.093%, respectively. The accuracy of exact mass was between 0.15 and 6.22 ppm. And the validation of the created database was performed by analyzing the tea samples. Thus, the proposed method is suitable for the precise identification of the flavors and fragrances added to tea matrix artificially without standard substances as a reference.
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Affiliation(s)
- Jianwu Wang
- Xiangya School of Public Health, Central South University, Hunan, Changsha, P.R. China
| | - Yuanxin Hang
- Xiangya School of Public Health, Central South University, Hunan, Changsha, P.R. China
| | - Tingting Yan
- Xiangya School of Public Health, Central South University, Hunan, Changsha, P.R. China
| | - Jiahui Liang
- College of Chemistry and Chemical Engineering, Hunan Normal University, Hunan, Changsha, P.R. China
| | - Zhiqiang Huang
- Inspection and Quarantine Technology Center of Hunan Entry-Exit Inspection and Quarantine Bureau, Hunan, Changsha, P.R. China
| | - Huilan Xu
- Xiangya School of Public Health, Central South University, Hunan, Changsha, P.R. China
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3
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Santhosh PB, Thomas N, Sudhakar S, Chadha A, Mani E. Phospholipid stabilized gold nanorods: towards improved colloidal stability and biocompatibility. Phys Chem Chem Phys 2017; 19:18494-18504. [DOI: 10.1039/c7cp03403b] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Biocompatible and colloidally stable gold nanorods (GNRs) with well-defined plasmonic properties are essential for biomedical and theranostic applications.
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Affiliation(s)
- Poornima Budime Santhosh
- Polymer Engineering and Colloid Science Laboratory
- Department of Chemical Engineering
- Indian Institute of Technology Madras
- Chennai-600036
- India
| | - Neethu Thomas
- Polymer Engineering and Colloid Science Laboratory
- Department of Chemical Engineering
- Indian Institute of Technology Madras
- Chennai-600036
- India
| | - Swathi Sudhakar
- Polymer Engineering and Colloid Science Laboratory
- Department of Chemical Engineering
- Indian Institute of Technology Madras
- Chennai-600036
- India
| | - Anju Chadha
- Laboratory of Bioorganic Chemistry
- Department of Biotechnology
- Indian Institute of Technology Madras
- Chennai-600036
- India
| | - Ethayaraja Mani
- Polymer Engineering and Colloid Science Laboratory
- Department of Chemical Engineering
- Indian Institute of Technology Madras
- Chennai-600036
- India
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4
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Identification of terpenoids from Ephedra combining with accurate mass and in-silico retention indices. Talanta 2013. [DOI: 10.1016/j.talanta.2012.10.018] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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5
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Place BJ, Field JA. Identification of novel fluorochemicals in aqueous film-forming foams used by the US military. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2012; 46:7120-7. [PMID: 22681548 PMCID: PMC3390017 DOI: 10.1021/es301465n] [Citation(s) in RCA: 296] [Impact Index Per Article: 24.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Aqueous film-forming foams (AFFFs) are a vital tool to fight large hydrocarbon fires and can be used by public, commercial, and military firefighting organizations. In order to possess these superior firefighting capabilities, AFFFs contain fluorochemical surfactants, of which many of the chemical identities are listed as proprietary. Large-scale controlled (e.g., training activities) and uncontrolled releases of AFFF have resulted in contamination of groundwater. Information on the composition of AFFF formulations is needed to fully define the extent of groundwater contamination, and the first step is to fully define the fluorochemical composition of AFFFs used by the US military. Fast atom bombardment mass spectrometry (FAB-MS) and high resolution quadrupole-time-of-flight mass spectrometry (QTOF-MS) were combined to elucidate chemical formulas for the fluorochemicals in AFFF mixtures, and, along with patent-based information, structures were assigned. Sample collection and analysis was focused on AFFFs that have been designated as certified for US military use. Ten different fluorochemical classes were identified in the seven military-certified AFFF formulations and include anionic, cationic, and zwitterionic surfactants with perfluoroalkyl chain lengths ranging from 4 to 12. The environmental implications are discussed, and research needs are identified.
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Affiliation(s)
| | - Jennifer A. Field
- Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR
- Corresponding Author Information: 1007 ALS Building Oregon State University Corvallis, OR 97331 Phone: 541-737-2265
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6
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Pinhancos R, Maass S, Ramanathan DM. High-resolution mass spectrometry method for the detection, characterization and quantitation of pharmaceuticals in water. JOURNAL OF MASS SPECTROMETRY : JMS 2011; 46:1175-1181. [PMID: 22124990 DOI: 10.1002/jms.2005] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The presence of pharmaceuticals in drinking water is an emerging environmental concern. In most environmental testing laboratories, LC-MS/MS assays based on selected reaction monitoring are used as part of a battery of tests used to assure water quality. Although LC-MS/MS continues to be the best tool for detecting pharmaceuticals in water, the combined use of hybrid high-resolution mass spectrometry (HRMS) and ultrahigh pressure liquid chromatography (UHPLC) is starting to become a practical tool to study emerging environmental contaminants. The hybrid LTQ-orbitrap mass spectrometer is suitable for integrated quantitative and qualitative bioanalysis because of the following reasons: (1) the ability to collect full-scan HRMS spectra with scan speeds suitable for UHPLC separations, (2) routine measurement of mass with less than 5 ppm mass accuracy, (3) high mass resolving power, and (4) ability to perform on-the-fly polarity switching in the linear ion trap (LTQ). In the present work, we provide data demonstrating the application of UHPLC-LTQ-orbitrap for the detection, characterization and quantification of pharmaceuticals and their metabolites in drinking water.
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Affiliation(s)
- Rebeca Pinhancos
- New Jersey Center for Science, Technology, and Mathematics, Kean University, 1000 Morris Avenue, Union, NJ 07083, USA
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7
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An integrated method for degradation products detection and characterization using hybrid ion trap/time-of-flight mass spectrometry and data processing techniques: Application to study of the degradation products of danofloxacin under stressed conditions. Anal Bioanal Chem 2011; 399:2475-86. [DOI: 10.1007/s00216-010-4629-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2010] [Revised: 12/15/2010] [Accepted: 12/17/2010] [Indexed: 10/18/2022]
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8
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Zhang LK, Pramanik BN. Characterization of major degradation products of an adenosine A2A receptor antagonist under stressed conditions by LC-MS and FT tandem MS analysis. JOURNAL OF MASS SPECTROMETRY : JMS 2010; 45:146-156. [PMID: 19911413 DOI: 10.1002/jms.1695] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Parkinson's disease (PD) is a very serious neurological disorder, and current methods of treatment fail to achieve long-term control. SCH 420814 is a potent, selective and orally active adenosine A(2A) receptor antagonist discovered by Schering-Plough. Stability testing provides evidence of the quality of a bulk drug when exposed to the influence of environmental factors. Understanding the drug degradation profiles is critical to the safety and potency assessment of the drug candidate for clinical trials. As a result, identification of degradation products has taken an important role in drug development process. In this study, a rapid and sensitive method was developed for the structural determination of the degradation products of SCH 420814 formed under different forced conditions. The study utilizes a combination of liquid chromatography-tandem-mass spectrometry (LC-MS/MS) and Fourier Transform (FT) MS techniques to obtain complementary information for structure elucidation of the unknowns. This combination approach has significant impact on degradation product identification. A total of ten degradation products of SCH 420814 were characterized using the developed method.
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Affiliation(s)
- Li-Kang Zhang
- Chemical Research, Schering-Plough Research Institute, 2015 Galloping Hill Road, Kenilworth, NJ 07033, USA.
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9
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Dernovics M, Lobinski R. Speciation Analysis of Selenium Metabolites in Yeast-Based Food Supplements by ICPMS—Assisted Hydrophilic Interaction HPLC—Hybrid Linear Ion Trap/Orbitrap MSn. Anal Chem 2008; 80:3975-84. [DOI: 10.1021/ac8002038] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mihaly Dernovics
- Department of Applied Chemistry, Corvinus University of Budapest, 1118 Budapest Villányi út 29−33, Hungary, Laboratoire de Chimie Analytique Bio-inorganique et Environnement, CNRS UMR 5254, Hélioparc, 2, Avenue Pr. Angot, F-64053 Pau, France, and Department of Analytical Chemistry, Warsaw University of Technology, 00-664 Warszawa, Poland
| | - Ryszard Lobinski
- Department of Applied Chemistry, Corvinus University of Budapest, 1118 Budapest Villányi út 29−33, Hungary, Laboratoire de Chimie Analytique Bio-inorganique et Environnement, CNRS UMR 5254, Hélioparc, 2, Avenue Pr. Angot, F-64053 Pau, France, and Department of Analytical Chemistry, Warsaw University of Technology, 00-664 Warszawa, Poland
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10
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Bristow T, Constantine J, Harrison M, Cavoit F. Performance optimisation of a new-generation orthogonal-acceleration quadrupole-time-of-flight mass spectrometer. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2008; 22:1213-1222. [PMID: 18348222 DOI: 10.1002/rcm.3499] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Orthogonal-acceleration quadrupole time-of-flight (oa-QTOF) mass spectrometers, employed for accurate mass measurement, have been commercially available for well over a decade. A limitation of the early instruments of this type was the narrow ion abundance range over which accurate mass measurements could be made with a high degree of certainty. Recently, a new generation of oa-QTOF mass spectrometers has been developed and these allow accurate mass measurements to be recorded over a much greater range of ion abundances. This development has resulted from new ion detection technology and improved electronic stability or by accurate control of the number of ions reaching the detector. In this report we describe the results from experiments performed to evaluate the mass measurement performance of the Bruker micrOTOF-Q, a member of the new-generation oa-QTOFs. The relationship between mass accuracy and ion abundance has been extensively evaluated and mass measurement accuracy remained stable (+/-1.5 m m/z units) over approximately 3-4 orders of magnitude of ion abundance. The second feature of the Bruker micrOTOF-Q that was evaluated was the SigmaFit function of the software. This isotope pattern-matching algorithm provides an exact numerical comparison of the theoretical and measured isotope patterns as an additional identification tool to accurate mass measurement. The smaller the value, the closer the match between theoretical and measured isotope patterns. This information is then employed to reduce the number of potential elemental formulae produced from the mass measurements. A relationship between the SigmaFit value and ion abundance has been established. The results from the study for both mass accuracy and SigmaFit were employed to define the performance criteria for the micrOTOF-Q. This provided increased confidence in the selection of elemental formulae resulting from accurate mass measurements.
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Affiliation(s)
- Tony Bristow
- AstraZeneca, Process Research and Development, Silk Road Business Park, Charter Way, Macclesfield, UK.
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11
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Petyuk VA, Jaitly N, Moore RJ, Ding J, Metz TO, Tang K, Monroe ME, Tolmachev AV, Adkins JN, Belov ME, Dabney AR, Qian WJ, Camp DG, Smith RD. Elimination of systematic mass measurement errors in liquid chromatography-mass spectrometry based proteomics using regression models and a priori partial knowledge of the sample content. Anal Chem 2008; 80:693-706. [PMID: 18163597 PMCID: PMC2518823 DOI: 10.1021/ac701863d] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The high mass measurement accuracy and precision available with recently developed mass spectrometers is increasingly used in proteomics analyses to confidently identify tryptic peptides from complex mixtures of proteins, as well as post-translational modifications and peptides from nonannotated proteins. To take full advantage of high mass measurement accuracy instruments, it is necessary to limit systematic mass measurement errors. It is well known that errors in m/z measurements can be affected by experimental parameters that include, for example, outdated calibration coefficients, ion intensity, and temperature changes during the measurement. Traditionally, these variations have been corrected through the use of internal calibrants (well-characterized standards introduced with the sample being analyzed). In this paper, we describe an alternative approach where the calibration is provided through the use of a priori knowledge of the sample being analyzed. Such an approach has previously been demonstrated based on the dependence of systematic error on m/z alone. To incorporate additional explanatory variables, we employed multidimensional, nonparametric regression models, which were evaluated using several commercially available instruments. The applied approach is shown to remove any noticeable biases from the overall mass measurement errors and decreases the overall standard deviation of the mass measurement error distribution by 1.2-2-fold, depending on instrument type. Subsequent reduction of the random errors based on multiple measurements over consecutive spectra further improves accuracy and results in an overall decrease of the standard deviation by 1.8-3.7-fold. This new procedure will decrease the false discovery rates for peptide identifications using high-accuracy mass measurements.
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Affiliation(s)
- Vladislav A Petyuk
- Biological Sciences Division and Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99352, USA
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12
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Stroh JG, Petucci CJ, Brecker SJ, Huang N, Lau JM. Automated sub-ppm mass accuracy on an ESI-TOF for use with drug discovery compound libraries. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2007; 18:1612-6. [PMID: 17629494 DOI: 10.1016/j.jasms.2007.06.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2007] [Revised: 06/12/2007] [Accepted: 06/12/2007] [Indexed: 05/16/2023]
Abstract
An automated, routine method to obtain sub-ppm accurate mass data on a benchtop electrospray ionization time-of-flight (ESI-TOF) mass spectrometer is described. Standards in the mass range 114 to 734 Da were analyzed over a 5-day period to demonstrate intra- and interday precision and mean mass accuracy less than 1 ppm. One hundred drug discovery pharmaceutical compounds were used to demonstrate an absolute average mass accuracy of 0.47 +/- 0.31 ppm. This is in contrast to previous reports of accurate mass analysis using time-of-flight mass spectrometry (TOFMS) technology that operates within 3 to 5 ppm. The same 100 samples were also analyzed using Fourier transform mass spectrometry (FTMS) technology and yielded comparable results to the TOFMS analysis.
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Affiliation(s)
- Justin G Stroh
- Discovery Analytical Chemistry-Chemical Technologies, Chemical and Screening Sciences, Wyeth Research, Collegeville, Pennsylvania 19426, USA.
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13
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Affiliation(s)
- Tao Liu
- Biological Sciences Division and Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99354
| | - Mikhail E. Belov
- Biological Sciences Division and Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99354
| | - Navdeep Jaitly
- Biological Sciences Division and Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99354
| | - Wei-Jun Qian
- Biological Sciences Division and Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99354
| | - Richard D. Smith
- Biological Sciences Division and Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99354
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14
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Boernsen KO, Egge-Jacobsen W, Inverardi B, Strom T, Streit F, Schiebel HM, Benet LZ, Christians U. Assessment and validation of the MS/MS fragmentation patterns of the macrolide immunosuppressant everolimus. JOURNAL OF MASS SPECTROMETRY : JMS 2007; 42:793-802. [PMID: 17511017 DOI: 10.1002/jms.1215] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Everolimus (40-O-(2-hydroxyethyl)rapamycin, Certican) is a 31-membered macrolide lactone. In lymphocytes, it inhibits the mammalian target of rapamycin (mTOR) and is used as an immunosuppressant after organ transplantation. Due to its instability in pure organic solvents and insufficient HPLC separation, NMR spectroscopy analysis of its metabolite structures is nearly impossible. Therefore, structural identification based on tandem mass spectrometry (MS/MS) and MS(n) fragmentation patterns is critical. Here, we have systematically assessed the fragmentation pattern of everolimus during liquid chromatography (LC)-electrospray ionization (ESI)-MS/MS and validated the fragment structures by (1) comparison with structurally identified derivatives (sirolimus), (2) high-resolution mass spectrometry, (3) elucidation of fragmentation pathways using ion trap mass spectrometry (up to MS(5)) and (4) H/D exchange. In comparison with the structurally related immunosuppressants tacrolimus and sirolimus, our study was complicated by the low ionization efficiency of everolimus. Detection of positive ions gave the best sensitivity, and everolimus and its fragments were mainly detected as sodium adducts. LC-ESI-MS/MS of everolimus in combination with collision-induced dissociation (CID) resulted in a complex fragmentation pattern and the structures of 53 fragments were identified. These detailed fragmentation pathways of everolimus provided the basis for structural elucidation of all everolimus metabolites generated in vivo und in vitro.
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Affiliation(s)
- K Olaf Boernsen
- Biomarker Development, Novartis Pharma AG, Basel, Switzerland
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15
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Huang JF, Zhang HJ, Lin B, Yu QW, Feng YQ. Multiresidue analysis of beta-agonists in pork by coupling polymer monolith microextraction to electrospray quadrupole time-of-flight mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2007; 21:2895-904. [PMID: 17663500 DOI: 10.1002/rcm.3165] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
A novel method of polymer monolith microextraction (PMME) using poly(methacrylic acid-co-ethylene glycol dimethacrylate) monolith combined with electrospray ionization quadrupole time-of-flight mass spectrometry (ESI-QTOF MS) was developed for the rapid and sensitive determination of beta-agonists in pork samples. The conditions of PMME were optimized for the improvement of extraction efficiency and reduction of the matrix interferences from pork. Under the optimal condition, the eluate solution allowed direct analysis by mass spectrometry. In the positive ion mode and in the multiple reaction monitoring (MRM) mode, the limits of detection (LODs) for beta-agonists were found to be 0.08 ng/g (clenbuterol, CLB), 0.18 ng/g (salbutamol, SBTM) and 0.26 ng/g (terbutaline, TBTL) in pork, respectively, with good inter- and intra-day precisions (2-10% for CLB, 11-23% for SBTM and 4-16% for TBTL). The proposed PMME/ESI-QTOF MS method was successfully applied to the determination of beta-agonist residues in thirteen real samples, and the positive samples were confirmed according to the identification points (IPs) system defined by Commission Decision 2002/657/EC. To investigate the matrix effect, the proposed method was compared with PMME-HPLC/ESI-QTOF MS and the slight decrease in sensitivity of PMME/ESI-QTOF MS was ascribed to the inter-analyte ion suppression.
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Affiliation(s)
- Jing-Fang Huang
- Department of Chemistry, Wuhan University, Wuhan 430072, PR China
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16
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Tolmachev AV, Monroe ME, Jaitly N, Petyuk VA, Adkins JN, Smith RD. Mass Measurement Accuracy in Analyses of Highly Complex Mixtures Based Upon Multidimensional Recalibration. Anal Chem 2006; 78:8374-85. [PMID: 17165830 DOI: 10.1021/ac0606251] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Mass spectrometry combined with a range of on-line separation techniques has become a powerful tool for characterization of complex mixtures, including protein digests in proteomics studies. Accurate mass measurements can be compromised due to variations that occur in the course of an on-line separation, e.g., due to excessive space charge in an ion trap, temperature changes, or other sources of instrument "drift". We have developed a multidimensional recalibration approach that utilizes existing information on the likely mixture composition, taking into account variable conditions of mass measurements, and that corrects the mass calibration for sets of individual peaks binned by, for example, the total ion count for the mass spectrum, the individual peak abundance, m/z value, and liquid chromatography separation time. The multidimensional recalibration approach uses a statistical matching of measured masses in such measurements, often exceeding 105, to a significant number of putative known species likely to be present in the mixture (i.e., having known accurate masses), to identify a subset of the detected species that serve as effective calibrants. The recalibration procedure involves optimization of the mass accuracy distribution (histogram), to provide a more confident distinction between true and false identifications. We report the mass accuracy improvement obtained for data acquired using a TOF and several FTICR mass spectrometers. We show that the multidimensional recalibration better compensates for systematic mass measurement errors and also significantly reduces the mass error spread: i.e., both the accuracy and precision of mass measurements are improved. The mass measurement improvement is found to be virtually independent of the initial instrument calibration, allowing, for example, less frequent calibration. We show that this recalibration can provide sub-ppm mass measurement accuracy for measurements of a complex fungal proteome tryptic digest and provide improved confidence or numbers of peptide identifications.
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Affiliation(s)
- Aleksey V Tolmachev
- Biological Sciences Division, Pacific Northwest National Laboratory, PO Box 999, Richland, Washington 99352, USA
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17
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Petrovic M, Barceló D. Application of liquid chromatography/quadrupole time-of-flight mass spectrometry (LC-QqTOF-MS) in the environmental analysis. JOURNAL OF MASS SPECTROMETRY : JMS 2006; 41:1259-67. [PMID: 17039579 DOI: 10.1002/jms.1103] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
This paper gives an overview of the potentials of liquid chromatography-hybrid quadrupole time-of-flight mass spectrometry (LC-QqTOF) in the environmental analysis. Examples of applications of QqTOF instruments for target analysis of pharmaceuticals and pesticides are presented and discussed, as well as applications aimed on the identification of unknown compounds present in environmental waters or on the elucidation of structures of biodegradation and photodegradation products. Specific issues such as uncertainty of mass measurement and quantitative performances are discussed in details.
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Affiliation(s)
- M Petrovic
- ICREA - Catalan Institution for Research and Advance Studies, Passeig Lluis Companys 23, 08010, Barcelona, Spain
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