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Maroto A, Dit Fouque DJ, Lartia R, Memboeuf A. Removal of isobaric interference using pseudo-multiple reaction monitoring and energy-resolved mass spectrometry for the isotope dilution quantification of a tryptic peptide. JOURNAL OF MASS SPECTROMETRY : JMS 2024; 59:e5025. [PMID: 38607249 DOI: 10.1002/jms.5025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Revised: 02/22/2024] [Accepted: 03/11/2024] [Indexed: 04/13/2024]
Abstract
Energy-resolved mass spectrometry (ERMS) and an isotopically labelled internal standard were successfully combined to accurately quantify a tryptic peptide despite the presence of an isobaric interference. For this purpose, electrospray ionisation tandem mass spectrometry (ESI-MS/MS) experiments were conducted into an ion trap instrument using an unconventional 8 m/z broadband isolation window, which encompassed both the tryptic peptide and its internal standard. Interference removal was assessed by determining an excitation voltage that was high enough to maintain a constant value for the analyte/internal standard peaks intensity ratio, thus ensuring accurate quantification even in the presence of isobaric contamination. Pseudo-multiple reaction monitoring (MRM) was employed above this excitation voltage to quantify the trypic peptide. The internal standard calibration model showed no lack of fit and exhibited a linear dynamic range from 0.5 μM up to 2.5 μM. The detection limit was 0.08 μM. The accuracy of the method was evaluated by quantifying the tryptic peptide of three reference samples intentionally contaminated with the isobaric interference. All the reference samples were accurately quantified with ∼1% deviation despite the isobaric contamination. Furthermore, we have demonstrated that this methodology can also be applied to quantify the isobaric peptide by standard additions down to 0.2 μM. Finally, liquid chromatography ERMS (LC ERMS) experiments yielded similar results, suggesting the potential of the proposed methodology for analysing complex samples.
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Tuo S, Liu C, Wang C, Kong B, Lu H, Zhong K, Li Y, Liu W, Yu J. Evaluation of Fourier deconvolution ion mobility spectrometer as high-performance gas chromatography detector for the analysis of plant extract flavors. J Chromatogr A 2024; 1714:464560. [PMID: 38070304 DOI: 10.1016/j.chroma.2023.464560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 12/02/2023] [Accepted: 12/04/2023] [Indexed: 01/05/2024]
Abstract
The Fourier deconvolution ion mobility spectrometer (FDIMS) offers multiplexing and improves the resolving power and signal-to-noise ratio. To evaluate the FDIMS as a detector for gas chromatography for the analysis of complex samples, we connected a drift tube ion mobility spectrometer to a commercial gas chromatograph and compared the performance including resolving power, sensitivity, and linear range using 2,6-di‑tert-butylpyridine. Mixed standards were also injected into the tandem system to evaluate the performance under optimized conditions. A complex plant extract sample used as natural flavoring was investigated using the resulting system. The results show that the instrument implemented with the Fourier deconvolution multiplexing method demonstrated higher performance over the traditional signal averaging method including higher resolving power, better limit of detection, and wider linear range for a variety of compounds and natural plant extract flavorings.
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Affiliation(s)
- Suxing Tuo
- Center of Technology, China Tobacco Hunan Industrial Co. Ltd., Changsha, 410007, China.
| | - Can Liu
- College of Chemical Engineering, Xiangtan University, Xiangtan, 411105, China
| | - Cheng Wang
- College of Chemical Engineering, Xiangtan University, Xiangtan, 411105, China
| | - Bo Kong
- Center of Technology, China Tobacco Hunan Industrial Co. Ltd., Changsha, 410007, China
| | - Hongbin Lu
- Center of Technology, China Tobacco Hunan Industrial Co. Ltd., Changsha, 410007, China
| | - Kejun Zhong
- Center of Technology, China Tobacco Hunan Industrial Co. Ltd., Changsha, 410007, China
| | - Yuqiao Li
- College of Chemical Engineering, Xiangtan University, Xiangtan, 411105, China
| | - Wenjie Liu
- College of Chemical Engineering, Xiangtan University, Xiangtan, 411105, China
| | - Jianna Yu
- College of Chemical Engineering, Xiangtan University, Xiangtan, 411105, China.
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Maroto A, Fouque DJD, Lartia R, Memboeuf A. LC-MS accurate quantification of a tryptic peptide co-eluted with an isobaric interference by using in-source collisional purification. Anal Bioanal Chem 2023; 415:7211-7221. [PMID: 37864586 DOI: 10.1007/s00216-023-04989-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2023] [Revised: 10/01/2023] [Accepted: 10/04/2023] [Indexed: 10/23/2023]
Abstract
Interferences from isobaric and isomeric compounds represent a common problem in liquid chromatography coupled to mass spectrometry (LC-MS). In this paper, in-source purification and chromatographic separation were combined with the aim of identifying isobaric contamination and quantifying accurately a compound despite the presence of an isobaric co-eluted interference. This is achieved by totally fragmenting in-source the precursor ions of the isobaric interference providing then LC-pseudo-MS2 capability, which allows an accurate quantification without the need for optimizing the chromatographic conditions to separate the co-eluted interference. To illustrate this concept, mixtures of tryptic and non-tryptic peptides were used. The ratio of peak areas of the tryptic peptide and its isotopically labelled internal standard was used not only for quantification with an internal standard calibration curve but also to know (1) if an isobaric interference co-eluted with the tryptic peptide; and (2) what is the minimum cone voltage necessary to ensure the complete removal of isobaric interference. This strategy was applied to quantify the tryptic peptide of two standards with known concentrations and, intentionally contaminated with the isobaric interference. The confidence intervals of the concentrations calculated with the internal standard calibration curve were 8.0 ± 0.5 μM (prepared at 8.0 μM) and 15.7 ± 0.5 μM (prepared at 16.1 μM) that confirm the tryptic peptide can be correctly quantified by in-source purification without the need for improving the chromatographic separation from its isobaric interference.
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Affiliation(s)
- Alicia Maroto
- Univ Brest, CNRS, UMR 6521 CEMCA, F-29200, Brest, France
| | | | - Rémy Lartia
- Univ Grenoble-Alpes, CNRS, UMR 5250 DCM, F-38058, Grenoble, France
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Bellumori M, Pallecchi M, Zonfrillo B, Lucio L, Menicatti M, Innocenti M, Mulinacci N, Bartolucci G. Study of Mono and Di- O-caffeoylquinic Acid Isomers in Acmella oleracea Extracts by HPLC-MS/MS and Application of Linear Equation of Deconvolution Analysis Algorithm for Their Characterization. Pharmaceuticals (Basel) 2023; 16:1375. [PMID: 37895846 PMCID: PMC10610532 DOI: 10.3390/ph16101375] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Revised: 09/20/2023] [Accepted: 09/26/2023] [Indexed: 10/29/2023] Open
Abstract
Chlorogenic acids, the esters of caffeic and quinic acids, are the main phenolic acids detected in Acmella oleracea extracts and have gained increasing interest in recent years due to their important biological activities. Given their structural similarity and instability, the correct analysis and identification of these compounds in plants is challenging. This study aimed to propose a simple and rapid determination of the A. oleracea caffeoylquinic isomers, applying an HPLC-MS/MS method supported by a mathematical algorithm (Linear Equation of Deconvolution Analysis (LEDA)). The three mono- and the three di-caffeoylquinic acids in roots of Acmella plants were studied by an ion trap MS analyzer. A separation by a conventional chromatographic method was firstly performed and an MS/MS characterization by energetic dimension of collision-induced dissociation mechanism was carried out. The analyses were then replicated using a short HPLC column and a fast elution gradient (ten minutes). Each acquired MS/MS data were processed by LEDA algorithm which allowed to assign a relative abundance in the reference ion signal to each isomer present. Quantitative results showed no significant differences between the two chromatographic systems proposed, proving that the use of LEDA algorithm allowed the distinction of the six isomers in a quarter of the time.
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Affiliation(s)
- Maria Bellumori
- NEUROFARBA Department, Section of Pharmaceutical and Nutraceutical Sciences, University of Florence, Via U. Schiff 6, Sesto Fiorentino, 50019 Firenze, Italy; (M.P.); (B.Z.); (L.L.); (M.M.); (M.I.); (N.M.)
| | | | | | | | | | | | | | - Gianluca Bartolucci
- NEUROFARBA Department, Section of Pharmaceutical and Nutraceutical Sciences, University of Florence, Via U. Schiff 6, Sesto Fiorentino, 50019 Firenze, Italy; (M.P.); (B.Z.); (L.L.); (M.M.); (M.I.); (N.M.)
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Pallecchi M, Lucio L, Braconi L, Menicatti M, Dei S, Teodori E, Bartolucci G. Isomers Recognition in HPLC-MS/MS Analysis of Human Plasma Samples by Using an Ion Trap Supported by a Linear Equations-Based Algorithm. Int J Mol Sci 2023; 24:11155. [PMID: 37446333 DOI: 10.3390/ijms241311155] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Revised: 06/23/2023] [Accepted: 06/28/2023] [Indexed: 07/15/2023] Open
Abstract
The tandem mass spectrometry (MS/MS) approach employing an ion trap mass analyzer (IT) was evaluated in isomers recognition. The proposed approach consists of sole, simple, and rapid liquid chromatographic separation (HPLC) without requiring resolution between the analytes. Then, the MS/MS properties were optimized to solve the signal assignment using post-processing data elaboration (LEDA). The IT-MS/MS experiment uses the same site, helium as collision gas, and different time steps to modify the applied conditions on the studied ions. Nevertheless, helium cannot ensure the quick energization of the precursor ion due to its small cross-section. Then, different combinations between excitation amplitude (ExA) and excitation time (ExT) were tested to achieve the activation of the fragmentation channels and the formation of the MS/MS spectrum. Usually, the IT-MS/MS acquisition cycle is longer for other multistage instruments, decreasing the frequency of sample data collection and influencing the chromatographic profile. To solve these problems, two time segments were set up, and the elution conditions were optimized with a compromise between peaks distinction and run time reduction. The developed HPLC-MS/MS method was checked and applied to analyze a series of human plasma samples spiked with an equimolar mixture of pair of isomers.
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Affiliation(s)
- Marco Pallecchi
- Neurofarba Department, Section of Pharmaceutical and Nutraceutical Sciences, University of Florence, Polo Scientifico, Via U. Schiff 6, Sesto Fiorentino, 50019 Firenze, Italy
| | - Luigi Lucio
- Neurofarba Department, Section of Pharmaceutical and Nutraceutical Sciences, University of Florence, Polo Scientifico, Via U. Schiff 6, Sesto Fiorentino, 50019 Firenze, Italy
| | - Laura Braconi
- Neurofarba Department, Section of Pharmaceutical and Nutraceutical Sciences, University of Florence, Polo Scientifico, Via U. Schiff 6, Sesto Fiorentino, 50019 Firenze, Italy
| | - Marta Menicatti
- Neurofarba Department, Section of Pharmaceutical and Nutraceutical Sciences, University of Florence, Polo Scientifico, Via U. Schiff 6, Sesto Fiorentino, 50019 Firenze, Italy
| | - Silvia Dei
- Neurofarba Department, Section of Pharmaceutical and Nutraceutical Sciences, University of Florence, Polo Scientifico, Via U. Schiff 6, Sesto Fiorentino, 50019 Firenze, Italy
| | - Elisabetta Teodori
- Neurofarba Department, Section of Pharmaceutical and Nutraceutical Sciences, University of Florence, Polo Scientifico, Via U. Schiff 6, Sesto Fiorentino, 50019 Firenze, Italy
| | - Gianluca Bartolucci
- Neurofarba Department, Section of Pharmaceutical and Nutraceutical Sciences, University of Florence, Polo Scientifico, Via U. Schiff 6, Sesto Fiorentino, 50019 Firenze, Italy
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Crotti S, Menicatti M, Pallecchi M, Bartolucci G. Tandem mass spectrometry approaches for recognition of isomeric compounds mixtures. MASS SPECTROMETRY REVIEWS 2023; 42:1244-1260. [PMID: 34841547 DOI: 10.1002/mas.21757] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Revised: 10/27/2021] [Accepted: 10/27/2021] [Indexed: 06/07/2023]
Abstract
The present review aims to collect the published literature pertaining the recognition of isobaric compounds (isomers or stereoisomers) using the features of tandem mass spectrometry (MS) experiments without any chromatographic separation or chemical modification (derivatization or isotopic enrichment) of the analytes. MS/MS methods possess high selectivity, wide dynamic range and high throughput capabilities. Generally, tandem MS has limited capability for distinguishing isomers that fragment similarly. However, some MS/MS methods have been developed and positively applied to isomers discrimination. Among the literature on this topic, the applications that fit on the review subject can be summarized as follow: (1) chiral discrimination by the kinetic method, (2) the use energy-resolved tandem mass spectra and the survival yield (SY) representation, (3) the kinetics evaluation of the ion-molecule interaction and (4) the postprocessing mathematical algorithm to resolve the isomers in MS/MS signal.
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Affiliation(s)
- Sara Crotti
- Fondazione Istituto di Ricerca Pediatrica Città della Speranza, Padova, Italy
| | - Marta Menicatti
- Dipartimento Neurofarba, Università di Firenze, Florence, Italy
| | - Marco Pallecchi
- Dipartimento Neurofarba, Università di Firenze, Florence, Italy
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da Silva Borges L, Batista JHC, Bozzini L, Lourenço CD, Lopes NP, Clososki GC, Vessecchi R. Are benzoylium and nitrilium ions produced from substituted 2-arene-2-oxazolines during mass spectrometry? A study based on density functional theory calculations, quantum theory of atoms in molecules, and electrospray ionization tandem mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2023; 37:e9449. [PMID: 36459945 DOI: 10.1002/rcm.9449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 11/25/2022] [Accepted: 11/27/2022] [Indexed: 06/17/2023]
Abstract
RATIONALE Oxazolines are important compounds for drug development, synthesis, and pharmaceutical applications. Interest in analyzing and developing methods to characterize reaction products from these small heterocyclics has led us to study the gas-phase reactivity and fragmentation of seven 2-arene-2-oxazolines compounds using computational chemistry combined with mass spectrometry. METHOD Protonation sites were investigated using computed proton affinity, gas-phase basicity, and some quantum chemistry descriptors of reactivity; the B3LYP/6-31+G(d,p) computational model was used. Fragmentation mechanisms were suggested by employing data from collision-induced dissociation (CID), energy-resolved plots from MS/MS spectra, multiple-stage experiments, and survival-yield method. RESULTS Protonation studies based on quantum theory of atoms in molecules (QTAIM) and computational thermochemistry were useful to describe the reactivity of the investigated 2-arene-2-oxazolines, which can be protonated at the nitrogen atom. Three major fragmentation pathways were identified for the protonated molecules: formation of (a) benzoylium or (b) nitrilium ions through elimination of 71 and 72 u from the protonated molecules, respectively, and (c) elimination of 54 u from [M+H]+ . These pathways were exploited by the density functional theory calculations combined with QTAIM studies. CONCLUSIONS Our results can help in identifying 2-arene-2-oxazoline derivatives using electrospray ionization tandem mass spectrometry (ESI-MS/MS), which can be applied for monitoring reactions through the identified diagnostic ions (product ions). Also, we can suggest that benzoylium and nitrilium ions emerge during fragmentation under CID conditions.
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Affiliation(s)
- Letícia da Silva Borges
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brasil
| | - João Henrique Carvalho Batista
- Núcleo de Pesquisa em Produtos Naturais e Sintéticos (NPPNS), Departamento Ciências Moleculares, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brasil
| | - Leandro Bozzini
- Núcleo de Pesquisa em Produtos Naturais e Sintéticos (NPPNS), Departamento Ciências Moleculares, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brasil
| | - Celso Donizete Lourenço
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brasil
| | - Norberto Peporine Lopes
- Núcleo de Pesquisa em Produtos Naturais e Sintéticos (NPPNS), Departamento Ciências Moleculares, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brasil
| | - Giuliano Cesar Clososki
- Núcleo de Pesquisa em Produtos Naturais e Sintéticos (NPPNS), Departamento Ciências Moleculares, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brasil
| | - Ricardo Vessecchi
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brasil
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8
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Simon C, Dührkop K, Petras D, Roth VN, Böcker S, Dorrestein PC, Gleixner G. Mass Difference Matching Unfolds Hidden Molecular Structures of Dissolved Organic Matter. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:11027-11040. [PMID: 35834352 PMCID: PMC9352317 DOI: 10.1021/acs.est.2c01332] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 06/20/2022] [Accepted: 06/30/2022] [Indexed: 05/30/2023]
Abstract
Ultrahigh-resolution Fourier transform mass spectrometry (FTMS) has revealed unprecedented details of natural complex mixtures such as dissolved organic matter (DOM) on a molecular formula level, but we lack approaches to access the underlying structural complexity. We here explore the hypothesis that every DOM precursor ion is potentially linked with all emerging product ions in FTMS2 experiments. The resulting mass difference (Δm) matrix is deconvoluted to isolate individual precursor ion Δm profiles and matched with structural information, which was derived from 42 Δm features from 14 in-house reference compounds and a global set of 11 477 Δm features with assigned structure specificities, using a dataset of ∼18 000 unique structures. We show that Δm matching is highly sensitive in predicting potential precursor ion identities in terms of molecular and structural composition. Additionally, the approach identified unresolved precursor ions and missing elements in molecular formula annotation (P, Cl, F). Our study provides first results on how Δm matching refines structural annotations in van Krevelen space but simultaneously demonstrates the wide overlap between potential structural classes. We show that this effect is likely driven by chemodiversity and offers an explanation for the observed ubiquitous presence of molecules in the center of the van Krevelen space. Our promising first results suggest that Δm matching can both unfold the structural information encrypted in DOM and assess the quality of FTMS-derived molecular formulas of complex mixtures in general.
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Affiliation(s)
- Carsten Simon
- Molecular
Biogeochemistry, Department of Biogeochemical Processes, Max Planck Institute for Biogeochemistry, Hans-Knöll-Straße 10, 07745 Jena, Germany
| | - Kai Dührkop
- Chair
for Bioinformatics, Faculty of Mathematics and Computer Science, Friedrich Schiller University Jena, Ernst-Abbe-Platz 2, 07743 Jena, Germany
| | - Daniel Petras
- Collaborative
Mass Spectrometry Innovation Center, Skaggs School of Pharmacy and
Pharmaceutical Sciences, University of California
San Diego, 9500 Gilman Drive, MC 0657, La Jolla, California 92093-0657, United States of America
- CMFI
Cluster of Excellence, Interfaculty Institute of Microbiology and
Medicine, University of Tübingen, Auf der Morgenstelle 24, 72076 Tübingen, Germany
| | - Vanessa-Nina Roth
- Molecular
Biogeochemistry, Department of Biogeochemical Processes, Max Planck Institute for Biogeochemistry, Hans-Knöll-Straße 10, 07745 Jena, Germany
| | - Sebastian Böcker
- Chair
for Bioinformatics, Faculty of Mathematics and Computer Science, Friedrich Schiller University Jena, Ernst-Abbe-Platz 2, 07743 Jena, Germany
| | - Pieter C. Dorrestein
- Collaborative
Mass Spectrometry Innovation Center, Skaggs School of Pharmacy and
Pharmaceutical Sciences, University of California
San Diego, 9500 Gilman Drive, MC 0657, La Jolla, California 92093-0657, United States of America
| | - Gerd Gleixner
- Molecular
Biogeochemistry, Department of Biogeochemical Processes, Max Planck Institute for Biogeochemistry, Hans-Knöll-Straße 10, 07745 Jena, Germany
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Logerot E, Cazals G, Memboeuf A, Enjalbal C. Revealing C-terminal peptide amidation by the use of the survival yield technique. Anal Biochem 2022; 655:114823. [DOI: 10.1016/j.ab.2022.114823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Revised: 07/13/2022] [Accepted: 07/14/2022] [Indexed: 11/16/2022]
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Liu Y, Xu F, Wu F, Wang H, Liang Z, Ding CF. Chiral distinction of phenyl-substituted ethanediol enantiomers by measuring the ion mobility of their ternary complexes. Microchem J 2022. [DOI: 10.1016/j.microc.2022.107389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Pallecchi M, Menicatti M, Braconi L, Supuran CT, Dei S, Teodori E, Bartolucci G. Application of LEDA algorithm for the recognition of P-glycoprotein and Carbonic Anhydrase hybrid inhibitors and evaluation of their plasma stability by HPLC-MS/MS analysis. J Pharm Biomed Anal 2022; 219:114887. [PMID: 35753165 DOI: 10.1016/j.jpba.2022.114887] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Revised: 06/06/2022] [Accepted: 06/08/2022] [Indexed: 11/18/2022]
Abstract
Design and synthesis of new candidate drugs produces a large number of compounds that must be qualified and tested to evaluate their characteristics and potential applications. Therefore, many studies will be scheduled and, consequently, it will be necessary to arrange specific, reliable, fast and relatively cheap analytic methods to support this research. The manuscript proposes a new approach in the HPLC-MS/MS analysis by using a sole chromatographic set up, tuned to minimize the run time, without requiring high efficiency or resolution between the analytes. The chromatographic column was used only to avoid or limit the interference of sample matrix towards the analyte ionization process (matrix-effects). Then, the MS/MS properties were explored to solve the signal assignment, by performing a series of energy resolved experiments to optimize the parameters and applying an interesting post-processing data elaboration tool (LEDA). The reliability of the new approach was evaluated in a chemical stability study in PBS and human plasma samples of a series of isomeric compounds P-glycoprotein/Carbonic Anhydrase (P-gp/CA) hybrid inhibitors. The obtained results demonstrated the effectiveness (reliability 97%-100%) of the LEDA algorithm to recognize and to separate the possible isomers present in the samples. The obtained matrix-effects values (ME 96%-106%) established that the chromatographic set up (short column and fast elution gradient) was proper to avoid the matrix interferences, while recovery values (RE 88%-108%) indicate a suitable sample preparation, despite only a protein precipitation was carried out. The quantitative performances of proposed HPLC-MS/MS methods showed an accuracy ranging between 92% and 108% and a precision lower than 13% that allows to be confident on the determination of new P-gp/CA hybrid inhibitors in the degradation study. Therefore, the general procedure proposed was found adequate to study a series of isomeric compounds without their chromatographic separation but only by applying and developing the MS/MS features.
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Affiliation(s)
- Marco Pallecchi
- NEUROFARBA Department, Department of Neuroscience, Psychology, Drug Research and Child Health-Neurofarba-Pharmaceutical and Nutraceutical Sciences Section, University of Florence, Via U. Schiff 6, 50019 Sesto Fiorentino, Italy
| | - Marta Menicatti
- NEUROFARBA Department, Department of Neuroscience, Psychology, Drug Research and Child Health-Neurofarba-Pharmaceutical and Nutraceutical Sciences Section, University of Florence, Via U. Schiff 6, 50019 Sesto Fiorentino, Italy
| | - Laura Braconi
- NEUROFARBA Department, Department of Neuroscience, Psychology, Drug Research and Child Health-Neurofarba-Pharmaceutical and Nutraceutical Sciences Section, University of Florence, Via U. Schiff 6, 50019 Sesto Fiorentino, Italy
| | - Claudiu T Supuran
- NEUROFARBA Department, Department of Neuroscience, Psychology, Drug Research and Child Health-Neurofarba-Pharmaceutical and Nutraceutical Sciences Section, University of Florence, Via U. Schiff 6, 50019 Sesto Fiorentino, Italy
| | - Silvia Dei
- NEUROFARBA Department, Department of Neuroscience, Psychology, Drug Research and Child Health-Neurofarba-Pharmaceutical and Nutraceutical Sciences Section, University of Florence, Via U. Schiff 6, 50019 Sesto Fiorentino, Italy
| | - Elisabetta Teodori
- NEUROFARBA Department, Department of Neuroscience, Psychology, Drug Research and Child Health-Neurofarba-Pharmaceutical and Nutraceutical Sciences Section, University of Florence, Via U. Schiff 6, 50019 Sesto Fiorentino, Italy
| | - Gianluca Bartolucci
- NEUROFARBA Department, Department of Neuroscience, Psychology, Drug Research and Child Health-Neurofarba-Pharmaceutical and Nutraceutical Sciences Section, University of Florence, Via U. Schiff 6, 50019 Sesto Fiorentino, Italy.
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Kaeslin J, Zenobi R. Resolving isobaric interferences in direct infusion tandem mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2022; 36:e9266. [PMID: 35124854 PMCID: PMC9286799 DOI: 10.1002/rcm.9266] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 01/31/2022] [Accepted: 02/01/2022] [Indexed: 06/14/2023]
Abstract
RATIONALE The co-fragmentation of precursors in direct infusion (DI) tandem high-resolution mass spectrometry (HRMS) can complicate the fragment spectra and consequently lead to false hits during compound identification. METHODS The method herein described, termed IQAROS (incremental quadrupole acquisition to resolve overlapping spectra), modulates the intensities of precursors and fragments by stepwise movement of the quadrupole isolation window over the mass-to-charge (m/z) range of the precursors. The modulated signals are then deconvoluted by a linear regression model to reconstruct the fragment spectra with less interference. The hardware to demonstrate the use of IQAROS was an orbitrap with electrospray ionization (ESI) or secondary electrospray ionization (SESI), although the method can also be applied to other ionization techniques or mass analyzers. RESULTS Assessing the performance of IQAROS with isobaric standards revealed that the reconstructed fragment spectra match with spectra acquired from the pure standards and that more compounds were correctly identified compared with the classical approach with the quadrupole centered at the m/z value of the precursor of interest. Moreover, the strength of IQAROS is exemplified by the identification of two isobaric biomarkers directly from a breath sample with SESI-HRMS. CONCLUSIONS With IQAROS, cleaner fragment spectra of co-fragmenting isobars during DI-HRMS analysis can be obtained. IQAROS can easily be set up by the standard graphical user interface of the instrument. Therefore, it facilitates the characterization of features of interest in samples analyzed by DI-HRMS, for example, in high-throughput or real-time metabolomics.
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Affiliation(s)
- Jérôme Kaeslin
- Department of Chemistry and Applied BiosciencesETH ZürichZürichSwitzerland
| | - Renato Zenobi
- Department of Chemistry and Applied BiosciencesETH ZürichZürichSwitzerland
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Yatsyna V, Abikhodr AH, Ben Faleh A, Warnke S, Rizzo TR. High-Throughput Multiplexed Infrared Spectroscopy of Ion Mobility-Separated Species Using Hadamard Transform. Anal Chem 2022; 94:2912-2917. [PMID: 35113536 PMCID: PMC8851427 DOI: 10.1021/acs.analchem.1c04843] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
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Coupling vibrational
ion spectroscopy with high-resolution ion
mobility separation offers a promising approach for detailed analysis
of biomolecules in the gas phase. Improvements in the ion mobility
technology have made it possible to separate isomers with minor structural
differences, and their interrogation with a tunable infrared laser
provides vibrational fingerprints for unambiguous database-enabled
identification. Nevertheless, wide analytical application of this
technique requires high-throughput approaches for acquisition of vibrational
spectra of all species present in complex mixtures. In this work,
we present a novel multiplexed approach and demonstrate its utility
for cryogenic ion spectroscopy of peptides and glycans in mixtures.
Since the method is based on Hadamard transform multiplexing, it yields
infrared spectra with an increased signal-to-noise ratio compared
to a conventional signal averaging approach.
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Affiliation(s)
- Vasyl Yatsyna
- Laboratoire de Chimie Physique Moléculaire, École Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCPM, Station 6, CH-1015 Lausanne, Switzerland.,Department of Physics, University of Gothenburg, 412 96 Gothenburg, Sweden
| | - Ali H Abikhodr
- Laboratoire de Chimie Physique Moléculaire, École Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCPM, Station 6, CH-1015 Lausanne, Switzerland
| | - Ahmed Ben Faleh
- Laboratoire de Chimie Physique Moléculaire, École Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCPM, Station 6, CH-1015 Lausanne, Switzerland
| | - Stephan Warnke
- Laboratoire de Chimie Physique Moléculaire, École Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCPM, Station 6, CH-1015 Lausanne, Switzerland
| | - Thomas R Rizzo
- Laboratoire de Chimie Physique Moléculaire, École Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCPM, Station 6, CH-1015 Lausanne, Switzerland
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14
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Potapov A, McCoustra M. Physics and chemistry on the surface of cosmic dust grains: a laboratory view. INT REV PHYS CHEM 2021. [DOI: 10.1080/0144235x.2021.1918498] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Alexey Potapov
- Laboratory Astrophysics Group of the Max Planck Institute for Astronomy at the Friedrich Schiller University Jena, Jena, Germany
| | - Martin McCoustra
- Institute of Chemical Sciences, Heriot-Watt University, Edinburgh, UK
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15
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Jeanne Dit Fouque D, Maroto A, Memboeuf A. Structural analysis of a compound despite the presence of an isobaric interference by using in-source Collision Induced Dissociation and tandem mass spectrometry. JOURNAL OF MASS SPECTROMETRY : JMS 2021; 56:e4698. [PMID: 33480458 DOI: 10.1002/jms.4698] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Revised: 12/14/2020] [Accepted: 12/17/2020] [Indexed: 06/12/2023]
Abstract
The presence of an isobaric contaminant can drastically affect MS and MS/MS patterns leading to erroneous structural and quantitative analysis, which is a real challenge in mass spectrometry. Herein, we demonstrate that MS and MS/MS structural analysis of a compound can be successfully performed despite the presence of an isobaric interference with as low as few millidaltons mass difference by using pseudo-MS3 . To this end, in-source collisional excitation (in-source CID) and the Survival Yield (SY) technique (energy-resolved collision induced dissociation MS/MS) were performed on two different source geometries: a Z-spray and an orthogonal spray (with a transfer capillary) ionization sources on two different mass spectrometers. By using soft ionization conditions, the SY curve for the mixture is a linear combination of the SY curves from the pure compounds demonstrating the presence of two components in the mixture. In the case of harsher ionization conditions, the SY curve of the mixture perfectly overlaps the SY curve from the pure analyte. This observation demonstrates the isobaric interference has been completely removed by in-source CID fragmentation, independently of the source design, leaving then the analyte precursor ions only. Therefore, by measuring the MS spectrum in harsh ionization conditions and according to SY criterium, the compound of interest can be made free from isobaric interference paving the way for, for example, unequivocal HPLC-MS as well as HPLC-MS/MS structural and quantitative analysis despite the presence of a co-eluting isobaric interference.
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Affiliation(s)
| | - Alicia Maroto
- Univ Brest, UMR UBO-CNRS 6521, Brest, F-29200, France
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16
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Menicatti M, Pallecchi M, Ricciutelli M, Galarini R, Moretti S, Sagratini G, Vittori S, Lucarini S, Caprioli G, Bartolucci G. Determination of coeluted isomers in wine samples by application of MS/MS deconvolution analysis. JOURNAL OF MASS SPECTROMETRY : JMS 2020; 55:e4607. [PMID: 32677749 DOI: 10.1002/jms.4607] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Revised: 06/22/2020] [Accepted: 06/27/2020] [Indexed: 06/11/2023]
Abstract
Two organic acids isomers, 3-isopropylmalic acid (3-IPMA) and 2-isopropylmalic acid (2-IPMA), were identified and quantified in wine samples by using an LC-MS/MS method without any chromatographic separation, but processing the MS/MS data with a recently developed deconvolution algorithm (LEDA: linear equations deconvolution analysis), thus decreasing the time necessary for the process. In particular, the LEDA tool processes the MS/MS signals and assigns the relative concentrations (abundances) of the isomers in the sample, at the mg L-1 level. The efficiency of MS/MS signal assignment was improved by introducing five linear equations to define the LEDA matrix. Then, as a novel approach, an overdetermined system of linear equations was applied for the deconvolution of isomers. The use of LEDA to identify and quantify the isomers in wine samples, together with the choice of a short LC column and a fast elution gradient, simplifies the process and shortens the time needed. Furthermore, it was evaluated the quantitative determination of the IPMA isomers by using the calibration curve provided by the precursor ion MRM transition data. The calculated values of accuracy (recovery between 82.6% and 99.8%) and precision (RSD between 0.4% and 4.0%) confirm the validity of this quantitative approach and the ability of LEDA to establish the correct percentage of the MS/MS signal for each isomer. Finally, to compare the conventional LC-MS/MS method and our proposed method of LC-MS/MS coupled with LEDA post-processing elaboration, a series of real wine samples were analysed by both methods, and the results were compared.
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Affiliation(s)
- Marta Menicatti
- Dipartimento Neurofarba, Università di Firenze, Florence, Italy
| | - Marco Pallecchi
- Dipartimento Neurofarba, Università di Firenze, Florence, Italy
| | | | - Roberta Galarini
- Research and Development, Istituto Zooprofilattico Sperimentale dell'Umbria e delle Marche, Terni, Italy
| | - Simone Moretti
- Research and Development, Istituto Zooprofilattico Sperimentale dell'Umbria e delle Marche, Terni, Italy
| | - Gianni Sagratini
- Scuola di Scienze del Farmaco e Dei Prodotti della Salute, Università di Camerino, Camerino, Italy
| | - Sauro Vittori
- Scuola di Scienze del Farmaco e Dei Prodotti della Salute, Università di Camerino, Camerino, Italy
| | - Simone Lucarini
- Dipartimento di Scienze Biomolecolari, Università di Urbino, Urbino, Italy
| | - Giovanni Caprioli
- Scuola di Scienze del Farmaco e Dei Prodotti della Salute, Università di Camerino, Camerino, Italy
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17
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Maroto A, Jeanne Dit Fouque D, Memboeuf A. Ion trap MS using high trapping gas pressure enables unequivocal structural analysis of three isobaric compounds in a mixture by using energy-resolved mass spectrometry and the survival yield technique. JOURNAL OF MASS SPECTROMETRY : JMS 2020; 55:e4478. [PMID: 31834966 DOI: 10.1002/jms.4478] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 11/04/2019] [Accepted: 11/05/2019] [Indexed: 06/10/2023]
Abstract
Recently, it has been shown that energy-resolved mass spectrometry (MS) can provide quantitative information from two isomeric or isobaric compounds in mixtures by using the survival yield (SY) technique together with "gas-phase collisional purification" (GPCP) strategy (Anal. Chem., 2016, 88, p.10821). Herein, we present an improvement and an extension of this concept to the structural analysis of a model mixture of three isobaric compounds (two peptides and a polyether). By using default collision-induced dissociation (CID) tandem MS parameters on an ion trap instrument, the previous approach did not show any signs of isobaric contamination. However, by modifying CID conditions and using a threefold increase of the He trapping gas pressure (to reach 3.00·10-5 mbar), the SY curve was unexpectedly and strongly shifted to higher excitation voltages with two plateaus appearing. Those plateaus, indicating clearly the presence of three isobaric compounds, were taken as reliable indicators to perform GPCP at carefully selected excitation voltages in order to selectively fragment one compound after the other. In this way, CID mass spectra of each compound were correctly recovered, both in terms of fragment ion peaks and in terms of relative intensities, from energy-resolved MSn spectra of the three compounds mixture. This feature enables their unequivocal structural analysis as if samples were free from isobaric interferences. In this paper, we also discuss the possibility for recovering SY curves for pure compounds directly from the mixture. Clearly, in this case, the higher He trapping gas pressure made it possible to use the SY technique, for the first time, for the structural analysis in the case of mixtures of three isobaric compounds. This observation, quite unexpected, demonstrates that the trapping gas pressure is of paramount importance although it is usually not considered in energy-resolved MS for structural and/or quantitative analysis.
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Affiliation(s)
- Alicia Maroto
- CEMCA, Université de Brest, CNRS, Université Bretagne Loire, CS 93837, 6 Av. Le Gorgeu, Brest, 29238 Cedex 3, France
| | - Dany Jeanne Dit Fouque
- CEMCA, Université de Brest, CNRS, Université Bretagne Loire, CS 93837, 6 Av. Le Gorgeu, Brest, 29238 Cedex 3, France
| | - Antony Memboeuf
- CEMCA, Université de Brest, CNRS, Université Bretagne Loire, CS 93837, 6 Av. Le Gorgeu, Brest, 29238 Cedex 3, France
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18
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Kondyli A, Schrader W. Evaluation of the combination of different atmospheric pressure ionization sources for the analysis of extremely complex mixtures. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2020; 34:e8676. [PMID: 31773793 DOI: 10.1002/rcm.8676] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Revised: 11/20/2019] [Accepted: 11/26/2019] [Indexed: 06/10/2023]
Abstract
RATIONALE Characterization of complex samples remains a challenging task due to the high number of compounds present. Matrix effects, ion discrimination and suppression are limiting factors which force the use of different methods for the same sample to gain a broad understanding of complex mixtures. METHODS Various ionization techniques such as electrospray ionization (ESI), atmospheric pressure photoionization (APPI) and atmospheric pressure chemical ionization (APCI) have been used in various problems for complex mixture analysis. Especially demanding is the analysis of energy-related hydrocarbon mixtures, such as crude oil. Here, the different ionization sources alone and in combination with each other have been used on an ultrahigh resolution Orbitrap mass spectrometer to study a light crude oil. RESULTS Despite the great variety of the available ionization sources, there is no single technique which can fully characterize the crude oil. Each ionization technique shows a selectivity towards specific types of compounds. While ESI is the method of choice for the detection of polar compounds, APPI and APCI favor the detection of nonpolar and low-to-medium polar compounds, respectively. The combination of ESI/APPI favors hydrocarbons and oxygen-containing species. CONCLUSIONS Combining different ionization methods can be used as an alternative in order to gain more information about compounds present in a complex mixture although a combination of different ion sources could enhance suppression effects.
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Affiliation(s)
- Aikaterini Kondyli
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470, Mülheim an der Ruhr, Germany
| | - Wolfgang Schrader
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470, Mülheim an der Ruhr, Germany
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19
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Mao J, Zhang B, Zhang H, Elupula R, Grayson SM, Wesdemiotis C. Elucidating Branching Topology and Branch Lengths in Star-Branched Polymers by Tandem Mass Spectrometry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2019; 30:1981-1991. [PMID: 31363988 DOI: 10.1007/s13361-019-02260-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Revised: 05/21/2019] [Accepted: 05/26/2019] [Indexed: 06/10/2023]
Abstract
Tandem mass spectrometry (MS2) has been employed to elucidate the topology and branching architecture of star-branched polyethers. The polymers were ionized by matrix-assisted laser desorption/ionization (MALDI) to positive ions and dissociated after leaving the ion source via laser-induced fragmentation. The bond scissions caused under MALDI-MS2 conditions occur preferentially near the core-branch joining points due to energetically favorable homolytic and heterolytic bond cleavages near the core and release of steric strain and/or reduction of crowding. This unique fragmentation mode detaches complete arms from the core generating fragment ion series at the expected molecular weight of each branch. The number of fragment ion distributions observed combined with their mass-to-charge ratios permit conclusive determination of the degree of branching and the corresponding branch lengths, as demonstrated for differently branched homo- and mikto-arm polyether stars synthesized via azide-alkyne click chemistry. The results of this study underscore the utility of MS2 for the characterization of branching architecture and branch lengths of (co) polymers with two or more linear chains attached to a functionalized central core.
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Affiliation(s)
- Jialin Mao
- Department of Chemistry, Knight Chemical Laboratory, The University of Akron, Akron, OH, 44325-3601, USA
| | - Boyu Zhang
- Department of Chemistry, Tulane University, New Orleans, LA, 70118, USA
| | - Hong Zhang
- Department of Chemistry, Tulane University, New Orleans, LA, 70118, USA
| | - Ravinder Elupula
- Department of Chemistry, Tulane University, New Orleans, LA, 70118, USA
| | - Scott M Grayson
- Department of Chemistry, Tulane University, New Orleans, LA, 70118, USA
| | - Chrys Wesdemiotis
- Department of Chemistry, Knight Chemical Laboratory, The University of Akron, Akron, OH, 44325-3601, USA.
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20
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Cui CH, Fu Y, Jeon BM, Kim SC, Im WT. Novel enzymatic elimination method for the chromatographic purification of ginsenoside Rb 3 in an isomeric mixture. J Ginseng Res 2019; 44:784-789. [PMID: 33192121 PMCID: PMC7655484 DOI: 10.1016/j.jgr.2019.08.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Revised: 05/22/2019] [Accepted: 08/12/2019] [Indexed: 01/09/2023] Open
Abstract
Background The separation of isomeric compounds from a mixture is a recurring problem in chemistry and phytochemistry research. The purification of pharmacologically active ginsenoside Rb3 from ginseng extracts is limited by the co-existence of its isomer Rb2. The aim of the present study was to develop an enzymatic elimination-combined purification method to obtain pure Rb3 from a mixture of isomers. Methods To isolate Rb3 from the isomeric mixture, a simple enzymatic selective elimination method was used. A ginsenoside-transforming glycoside hydrolase (Bgp2) was employed to selectively hydrolyze Rb2 into ginsenoside Rd. Ginsenoside Rb3 was then efficiently separated from the mixture using a traditional chromatographic method. Results Chromatographic purification of Rb3 was achieved using this novel enzymatic elimination-combined method, with 58.6-times higher yield and 13.1% less time than those of the traditional chromatographic method, with a lower minimum column length for purification. The novelty of this study was the use of a recombinant glycosidase for the selective elimination of the isomer. The isolated ginsenoside Rb3 can be used in further pharmaceutical studies. Conclusions Herein, we demonstrated a novel enzymatic elimination-combined purification method for the chromatographic purification of ginsenoside Rb3. This method can also be applied to purify other isomeric glycoconjugates in mixtures.
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Affiliation(s)
- Chang-Hao Cui
- The Key Laboratory of Biotechnology for Medicinal Plant of Jiangsu Province, Jiangsu Normal University, Xuzhou, Jiangsu, China.,Intelligent Synthetic Biology Center, Daejeon, Republic of Korea
| | - Yaoyao Fu
- The Key Laboratory of Biotechnology for Medicinal Plant of Jiangsu Province, Jiangsu Normal University, Xuzhou, Jiangsu, China
| | - Byeong-Min Jeon
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea
| | - Sun-Chang Kim
- Intelligent Synthetic Biology Center, Daejeon, Republic of Korea.,Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea.,KAIST Institute for Biocentury, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea
| | - Wan-Taek Im
- Department of Biological Sciences, Hankyong National University, Anseong City, Kyonggi-Do, Republic of Korea
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21
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Haler JRN, de la Rosa VR, Massonnet P, Far J, Hoogenboom R, De Pauw E. Fundamental Studies on Poly(2-oxazoline) Side Chain Isomers Using Tandem Mass Spectrometry and Ion Mobility-Mass Spectrometry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2019; 30:1220-1228. [PMID: 30949970 DOI: 10.1007/s13361-019-02173-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2018] [Revised: 02/14/2019] [Accepted: 02/25/2019] [Indexed: 06/09/2023]
Abstract
When polymer mixtures become increasingly complex, the conventional analysis techniques become insufficient for complete characterization. Mass spectrometric techniques can satisfy this increasing demand for detailed sample characterization. Even though isobaric polymers are indistinguishable using simple mass spectrometry (MS) analyses, more advanced techniques such as tandem MS (MS/MS) or ion mobility (IM) can be used. Here, we report proof of concept for characterizing isomeric polymers, namely poly(2-n-propyl-2-oxazoline) (Pn-PrOx) and poly(2-isopropyl-2-oxazoline) (Pi-PrOx), using MS/MS and IM-MS. Pi-PrOx ions lose in intensity at higher accelerating voltages than Pn-PrOx ions during collision-induced dissociation (CID) MS/MS experiments. A Pn/i-PrOx mixture could also be titrated using survival yield calculations of either precursor ions or cation ejection species. IM-MS yielded shape differences in the degree of polymerization (DP) regions showing the structural rearrangements. Combined MS techniques are thus able to identify and deconvolute the molar mass distributions of the two isomers in a mixture. Finally, the MS/MS and IM-MS behaviors are compared for interpretation. Graphical Abstract .
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Affiliation(s)
- Jean R N Haler
- Mass Spectrometry Laboratory, MolSys Research unit, Quartier Agora, University of Liège, Allée du Six Aout 11, B-4000, Liège, Belgium.
| | - Victor R de la Rosa
- Supramolecular Chemistry Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281 S4, B-9000, Ghent, Belgium
| | - Philippe Massonnet
- Mass Spectrometry Laboratory, MolSys Research unit, Quartier Agora, University of Liège, Allée du Six Aout 11, B-4000, Liège, Belgium
| | - Johann Far
- Mass Spectrometry Laboratory, MolSys Research unit, Quartier Agora, University of Liège, Allée du Six Aout 11, B-4000, Liège, Belgium
| | - Richard Hoogenboom
- Supramolecular Chemistry Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281 S4, B-9000, Ghent, Belgium
| | - Edwin De Pauw
- Mass Spectrometry Laboratory, MolSys Research unit, Quartier Agora, University of Liège, Allée du Six Aout 11, B-4000, Liège, Belgium
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22
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Haler JRN, Massonnet P, Far J, de la Rosa VR, Lecomte P, Hoogenboom R, Jérôme C, De Pauw E. Gas-Phase Dynamics of Collision Induced Unfolding, Collision Induced Dissociation, and Electron Transfer Dissociation-Activated Polymer Ions. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2019; 30:563-572. [PMID: 30523570 DOI: 10.1007/s13361-018-2115-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Revised: 11/24/2018] [Accepted: 11/24/2018] [Indexed: 06/09/2023]
Abstract
Polymer characterizations are often performed using mass spectrometry (MS). Aside from MS and different tandem MS (MS/MS) techniques, ion mobility-mass spectrometry (IM-MS) has been recently added to the inventory of characterization technique. However, only few studies have focused on the reproducibility and robustness of polymer IM-MS analyses. Here, we perform collisional and electron-mediated activation of polymer ions before measuring IM drift times, collision cross-sections (CCS), or reduced ion mobilities (K0). The resulting IM behavior of different activated product ions is then compared to non-activated native intact polymer ions. First, we analyzed collision induced unfolding (CIU) of precursor ions to test the robustness of polymer ion shapes. Then, we focused on fragmentation product ions to test for shape retentions from the precursor ions: cation ejection species (CES) and product ions with m/z and charge state values identical to native intact polymer ions. The CES species are formed using both collision induced dissociation (CID) and electron transfer dissociation (ETD, formally ETnoD) experiments. Only small drift time, CCS, or K0 deviations between the activated/formed ions are observed compared to the native intact polymer ions. The polymer ion shapes seem to depend solely on their mass and charge state. The experiments were performed on three synthetic homopolymers: poly(ethoxy phosphate) (PEtP), poly(2-n-propyl-2-oxazoline) (Pn-PrOx), and poly(ethylene oxide) (PEO). These results confirm the robustness of polymer ion CCSs for IM calibration, especially singly charged polymer ions. The results are also discussed in the context of polymer analyses, CCS predictions, and probing ion-drift gas interaction potentials. Graphical Abstract.
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Affiliation(s)
- Jean R N Haler
- Mass Spectrometry Laboratory, MolSys Research unit, Quartier Agora, University of Liège, Allée du Six Aout 11, B-4000, Liège, Belgium.
| | - Philippe Massonnet
- Mass Spectrometry Laboratory, MolSys Research unit, Quartier Agora, University of Liège, Allée du Six Aout 11, B-4000, Liège, Belgium
| | - Johann Far
- Mass Spectrometry Laboratory, MolSys Research unit, Quartier Agora, University of Liège, Allée du Six Aout 11, B-4000, Liège, Belgium
| | - Victor R de la Rosa
- Supramolecular Chemistry Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281 S4, B-9000, Ghent, Belgium
| | - Philippe Lecomte
- Center for Education and Research on Macromolecules, CESAM Research Unit, Quartier Agora, University of Liège, Allée du Six Aout 13, B-4000, Liège, Belgium
| | - Richard Hoogenboom
- Supramolecular Chemistry Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281 S4, B-9000, Ghent, Belgium
| | - Christine Jérôme
- Center for Education and Research on Macromolecules, CESAM Research Unit, Quartier Agora, University of Liège, Allée du Six Aout 13, B-4000, Liège, Belgium
| | - Edwin De Pauw
- Mass Spectrometry Laboratory, MolSys Research unit, Quartier Agora, University of Liège, Allée du Six Aout 11, B-4000, Liège, Belgium
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23
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Jeanne Dit Fouque D, Maroto A, Memboeuf A. Internal Standard Quantification Using Tandem Mass Spectrometry of a Tryptic Peptide in the Presence of an Isobaric Interference. Anal Chem 2018; 90:14126-14130. [PMID: 30462486 DOI: 10.1021/acs.analchem.8b05016] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Model mixtures of isobaric peptides were studied to evaluate the possibility, using tandem mass spectrometry experiments, for internal standard quantification of a tryptic peptide in the presence of an isobaric interference. To this end, direct injection electrospray ionization-tandem mass spectrometry (ESI-MS/MS) experiments were performed on an ion trap instrument using a large mass-selection window (15 m/ z) encompassing the isobaric mixture and the internal standard; MS/MS experiments were carried out to remove completely the interference from the mixture by fragmenting it. This allowed for the correct intensity assignment for the protonated peptide peak and, thus, for the analyte to be quantified through the relative intensity estimate of this peak with respect to the internal standard. This was done by monitoring the 15 m/ z mass-selection window only and without the necessity for careful inspection of any fragment ions peaks. The interference removal was assessed by determining an excitation voltage large enough for the analyte/internal standard ratio to remain constant ensuring correct quantification despite isobaric contamination. A calibration curve was obtained to predict reference samples and compared to reference samples purposely spiked with the interference using the proposed methodology; internal standard quantification of the analyte was made possible with ∼1% deviation despite the isobaric contamination.
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Affiliation(s)
- Dany Jeanne Dit Fouque
- CEMCA, Université de Brest, CNRS, Université Bretagne Loire, CS 93837, 6 Av. Le Gorgeu , Brest 29238 Cedex 3, France
| | - Alicia Maroto
- CEMCA, Université de Brest, CNRS, Université Bretagne Loire, CS 93837, 6 Av. Le Gorgeu , Brest 29238 Cedex 3, France
| | - Antony Memboeuf
- CEMCA, Université de Brest, CNRS, Université Bretagne Loire, CS 93837, 6 Av. Le Gorgeu , Brest 29238 Cedex 3, France
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24
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Menicatti M, Pallecchi M, Bua S, Vullo D, Di Cesare Mannelli L, Ghelardini C, Carta F, Supuran CT, Bartolucci G. Resolution of co-eluting isomers of anti-inflammatory drugs conjugated to carbonic anhydrase inhibitors from plasma in liquid chromatography by energy-resolved tandem mass spectrometry. J Enzyme Inhib Med Chem 2018; 33:671-679. [PMID: 29536775 PMCID: PMC6010112 DOI: 10.1080/14756366.2018.1445737] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Revised: 02/22/2018] [Accepted: 02/23/2018] [Indexed: 01/11/2023] Open
Abstract
Rheumatoid arthritis (RA) is a chronic inflammatory disease caused by a faulty autoimmune response. Recently, it was reported that some human carbonic anhydrases (CAs) isoforms are overexpressed in inflamed synovium of RA patients. New CA inhibitors (CAIs) incorporating CA-binding moiety and the cyclooxygenase inhibitor tail (nonsteroidal anti-inflammatory drug [NSAID] type) were studied. The aim of this work is the evaluation of the chemical stability of NSAID - CAI hybrids towards spontaneous or enzymatic hydrolysis by LC-MS/MS. The analytes are isomer pairs of 6- or 7-hydroxycoumarin, their different fragment ions abundances allowed the development of a mathematical tool (LEDA) to distinguish them. LEDA reliability at ng mL-1 level was checked (>90%), being proved the effectiveness in the correct assignment of the isomer present in the sample. The hybrids resulted stable in all tested matrices allowing us to conclude that these compounds reach the target tissues unmodified, opening perspectives for their development in the treatment of inflammation.
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Affiliation(s)
- Marta Menicatti
- NEUROFARBA Department, Sezione di Scienze Farmaceutiche, University of Florence, Florence, Italy
| | - Marco Pallecchi
- NEUROFARBA Department, Sezione di Scienze Farmaceutiche, University of Florence, Florence, Italy
| | - Silvia Bua
- NEUROFARBA Department, Sezione di Scienze Farmaceutiche, University of Florence, Florence, Italy
| | - Daniela Vullo
- Polo Scientifico, Laboratorio di Chimica Bioinorganica, University of Florence, Florence, Italy
| | | | - Carla Ghelardini
- NEUROFARBA Department, Sezione di Farmacologia e Tossicologia, University of Florence, Florence, Italy
| | - Fabrizio Carta
- NEUROFARBA Department, Sezione di Scienze Farmaceutiche, University of Florence, Florence, Italy
| | - Claudiu T. Supuran
- NEUROFARBA Department, Sezione di Scienze Farmaceutiche, University of Florence, Florence, Italy
| | - Gianluca Bartolucci
- NEUROFARBA Department, Sezione di Scienze Farmaceutiche, University of Florence, Florence, Italy
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Jeanne Dit Fouque D, Lartia R, Maroto A, Memboeuf A. Quantification of intramolecular click chemistry modified synthetic peptide isomers in mixtures using tandem mass spectrometry and the survival yield technique. Anal Bioanal Chem 2018; 410:5765-5777. [DOI: 10.1007/s00216-018-1258-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Accepted: 07/10/2018] [Indexed: 10/28/2022]
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Jia W, Shi L, Chu X. Untargeted screening of sulfonamides and their metabolites in salmon using liquid chromatography coupled to quadrupole Orbitrap mass spectrometry. Food Chem 2018; 239:427-433. [DOI: 10.1016/j.foodchem.2017.06.143] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Revised: 06/23/2017] [Accepted: 06/27/2017] [Indexed: 01/11/2023]
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Holmes JL, van Huizen NA, Burgers PC. Proton affinities and ion enthalpies. EUROPEAN JOURNAL OF MASS SPECTROMETRY (CHICHESTER, ENGLAND) 2017; 23:341-350. [PMID: 29183197 PMCID: PMC6134689 DOI: 10.1177/1469066717728451] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Accepted: 08/05/2017] [Indexed: 06/07/2023]
Abstract
Proton affinities of a number of alkyl acetates (CH3-C(=O)-OR) and of methyl alkanoates (R-C(=O)-OCH3, R=H, alkyl) have been assembled from the literature or measured using the kinetic method. It was observed that the proton affinities for the isomeric species CH3-C(=O)-OR and R-C(=O)-OCH3 are almost identical, an unexpected result as the charge in these protonated ester molecules is largely at the keto carbon atom and so this site should be more sensitive to alkyl substitution. Analysis of the data, including those from lone pair ionisation and core-electron ionisation experiments available from the literature, indicate that after protonation, extensive charge relaxation (or polarisation) takes place (as is also the case, according to the literature, after core-electron ionisation). By contrast, after lone pair ionisation, which results in radical cations, such relaxation processes are relatively less extensive. As a consequence, changes in ion enthalpies of these protonated molecules follow more closely the changes in neutral enthalpies, compared with changes in enthalpies of the corresponding radical cations, formed by electron detachment. Preliminary analyses of published energetic data indicate that the above finding for organic esters may well be another example of a more general phenomenon.
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Affiliation(s)
- John L Holmes
- Department of Chemistry and Biological
Sciences, University of Ottawa, Ottawa, Canada
| | - Nick A van Huizen
- Department of Neurology, Laboratory of
Neuro-Oncology, Erasmus Medical Center, Rotterdam, the Netherlands
- Department of Surgery, Erasmus Medical
Center, 3015 CN, Rotterdam, the Netherlands
| | - Peter C Burgers
- Department of Neurology, Laboratory of
Neuro-Oncology, Erasmus Medical Center, Rotterdam, the Netherlands
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