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Xi Y, Muddiman DC. Enhancing Metabolomic Coverage in Positive Ionization Mode Using Dicationic Reagents by Infrared Matrix-Assisted Laser Desorption Electrospray Ionization. Metabolites 2021; 11:810. [PMID: 34940568 PMCID: PMC8708802 DOI: 10.3390/metabo11120810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2021] [Revised: 11/19/2021] [Accepted: 11/23/2021] [Indexed: 11/16/2022] Open
Abstract
Mass spectrometry imaging is a powerful tool to analyze a large number of metabolites with their spatial coordinates collected throughout the sample. However, the significant differences in ionization efficiency pose a big challenge to metabolomic mass spectrometry imaging. To solve the challenge and obtain a complete data profile, researchers typically perform experiments in both positive and negative ionization modes, which is time-consuming. In this work, we evaluated the use of the dicationic reagent, 1,5-pentanediyl-bis(1-butylpyrrolidinium) difluoride (abbreviated to [C5(bpyr)2]F2) to detect a broad range of metabolites in the positive ionization mode by infrared matrix-assisted laser desorption electrospray ionization mass spectrometry imaging (IR-MALDESI MSI). [C5(bpyr)2]F2 at 10 µM was doped in 50% MeOH/H2O (v/v) electrospray solvent to form +1 charged adducted ions with anionic species (-1 charged) through post-electrospray ionization. This method was demonstrated with sectioned rat liver and hen ovary. A total of 73 deprotonated metabolites from rat liver tissue sections were successfully adducted with [C5(bpyr)2]2+ and putatively identified in the adducted positive ionization polarity, along with 164 positively charged metabolite ions commonly seen in positive ionization mode, which resulted in 44% increased molecular coverage. In addition, we were able to generate images of hen ovary sections showing their morphological features. Following-up tandem mass spectrometry (MS/MS) indicated that this dicationic reagent [C5(bpyr)2]2+ could form ionic bonds with the headgroup of glycerophospholipid ions. The addition of the dicationic reagent [C5(bpyr)2]2+ in the electrospray solvent provides a rapid and effective way to enhance the detection of metabolites in positive ionization mode.
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Affiliation(s)
- Ying Xi
- FTMS Laboratory for Human Health Research, Department of Chemistry, North Carolina State University, Raleigh, NC 27695, USA;
| | - David C. Muddiman
- FTMS Laboratory for Human Health Research, Department of Chemistry, North Carolina State University, Raleigh, NC 27695, USA;
- Molecular Education, Technology and Research Innovation Center (METRIC), North Carolina State University, Raleigh, NC 27695, USA
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Lange T, Thomas A, Görgens C, Bidlingmaier M, Schilbach K, Fichant E, Delahaut P, Thevis M. Comprehensive insights into the formation of metabolites of the ghrelin mimetics capromorelin, macimorelin and tabimorelin as potential markers for doping control purposes. Biomed Chromatogr 2021; 35:e5075. [PMID: 33458843 DOI: 10.1002/bmc.5075] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 01/11/2021] [Accepted: 01/14/2021] [Indexed: 12/25/2022]
Abstract
Analytical methods to determine the potential misuse of the ghrelin mimetics capromorelin (CP-424,391), macimorelin (macrilen, EP-01572) and tabimorelin (NN703) in sports were developed. Therefore, different extraction strategies, i.e. solid-phase extraction, protein precipitation, as well as a "dilute-and-inject" approach, from urine and EDTA-plasma were assessed and comprehensive in vitro/in vivo experiments were conducted, enabling the identification of reliable target analytes by means of high resolution mass spectrometry. The drugs' biotransformation led to the preliminary identification of 51 metabolites of capromorelin, 12 metabolites of macimorelin and 13 metabolites of tabimorelin. Seven major metabolites detected in rat urine samples collected post-administration of 0.5-1.0 mg of a single oral dose underwent in-depth characterization, facilitating their implementation into future confirmatory test methods. In particular, two macimorelin metabolites exhibiting considerable abundances in post-administration rat urine samples were detected, which might contribute to an improved sensitivity, specificity, and detection window in case of human sports drug testing programs. Further, the intact drugs were implemented into World Anti-Doping Agency-compliant initial testing (limits of detection 0.02-0.60 ng/ml) and confirmation procedures (limits of identification 0.18-0.89 ng/ml) for human urine and blood matrices. The obtained results allow extension of the test spectrum of doping agents in multitarget screening assays for growth hormone-releasing factors from human urine.
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Affiliation(s)
- Tobias Lange
- Center for Preventive Doping Research/Institute of Biochemistry, German Sport University Cologne, Am Sportpark Müngersdorf 6, Cologne, 50933, Germany
| | - Andreas Thomas
- Center for Preventive Doping Research/Institute of Biochemistry, German Sport University Cologne, Am Sportpark Müngersdorf 6, Cologne, 50933, Germany
| | - Christian Görgens
- Center for Preventive Doping Research/Institute of Biochemistry, German Sport University Cologne, Am Sportpark Müngersdorf 6, Cologne, 50933, Germany
| | - Martin Bidlingmaier
- Endocrine Laboratory, Medizinische Klinik und Poliklinik IV, Klinikum der Universität München, Ziemssenstraße 1, Munich, 80336, Germany
| | - Katharina Schilbach
- Endocrine Laboratory, Medizinische Klinik und Poliklinik IV, Klinikum der Universität München, Ziemssenstraße 1, Munich, 80336, Germany
| | - Eric Fichant
- Département Santé, CER Groupe, Rue du Point du Jour 8, Marloie, 6900, Belgium
| | - Philippe Delahaut
- Département Santé, CER Groupe, Rue du Point du Jour 8, Marloie, 6900, Belgium
| | - Mario Thevis
- Center for Preventive Doping Research/Institute of Biochemistry, German Sport University Cologne, Am Sportpark Müngersdorf 6, Cologne, 50933, Germany.,European Monitoring Center for Emerging Doping Agents, Am Sportpark Müngersdorf 6, Cologne, 50933, Germany
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Grbović G, Trebše P, Dolenc D, Lebedev AT, Sarakha M. LC/MS study of the UV filter hexyl 2-[4-(diethylamino)-2-hydroxybenzoyl]-benzoate (DHHB) aquatic chlorination with sodium hypochlorite. JOURNAL OF MASS SPECTROMETRY : JMS 2013; 48:1232-40. [PMID: 24259212 DOI: 10.1002/jms.3286] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2013] [Revised: 09/22/2013] [Accepted: 09/25/2013] [Indexed: 05/09/2023]
Abstract
The fate of modern personal care products in the environment is becoming a matter of increasing concern because of the growing production and assortment of these compounds. More and more chemicals of this class are treated as emerging contaminants. Transformation of commercially available products in the environment may result in the formation of a wide array of their metabolites. Personal care products in swimming pools and in drinking water reservoirs may undergo oxidation or chlorination. There is much data on the formation of more toxic metabolites from original low toxicity commercial products. Therefore, reliable identification of all possible transformation products and a thorough study of their physicochemical and biological properties are of high priority. The present study deals with the identification of the products of the aquatic chlorination of the hexyl 2-[4-(diethylamino)-2-hydroxybenzoyl]-benzoate ultraviolet filter. High-performance liquid chromatography/mass spectrometry (HPLC/MS) and HPLC/MS/MS with accurate mass measurements were used for this purpose. As a result, three chlorinated transformation products were identified.
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Affiliation(s)
- G Grbović
- Center for Chemistry, Institute of Chemistry, Technology, and Metallurgy (ICTM), University of Belgrade, 11000, Belgrade, Serbia
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Guo C, Yue L, Guo M, Jiang K, Pan Y. Elimination of benzene from protonated N-benzylindoline: benzyl cation/proton transfer or direct proton transfer? JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2013; 24:381-387. [PMID: 23361371 DOI: 10.1007/s13361-012-0561-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2012] [Revised: 12/06/2012] [Accepted: 12/07/2012] [Indexed: 06/01/2023]
Abstract
Collision-induced dissociation (CID) of protonated N-benzylindoline and its derivatives was investigated by electrospray ionization tandem mass spectrometry (ESI-MS/MS). Elimination of benzene was observed besides hydride transfer and electron transfer reactions. D-labeling experiments and accurate mass determinations of the product ions confirm that the external proton is retained in the fragment ion, and the elimination reaction was proposed to be initiated by benzyl cation transfer rather than proton transfer. Benzyl cation transfer from the nitrogen atom to one of the sp(2)-hybridized carbon atoms in the indoline core is the key step, and subsequent proton transfer reaction leads to the elimination of benzene. Density functional theory (DFT)-based calculations were performed and the computational results also support the benzyl cation/proton transfer mechanism. Figure ᅟ
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Affiliation(s)
- Cheng Guo
- Department of Chemistry, Zhejiang University, Hangzhou, China
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Parera M, Dachs A, Solà M, Pla-Quintana A, Roglans A. Direct Detection of Key Intermediates in Rhodium(I)-Catalyzed [2+2+2] Cycloadditions of Alkynes by ESI-MS. Chemistry 2012; 18:13097-107. [DOI: 10.1002/chem.201200880] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2012] [Revised: 07/03/2012] [Indexed: 11/10/2022]
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Hu N, Tu YP, Jiang K, Pan Y. Intramolecular Charge Transfer in the Gas Phase: Fragmentation of Protonated Sulfonamides in Mass Spectrometry. J Org Chem 2010; 75:4244-50. [DOI: 10.1021/jo100761k] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Nan Hu
- Department of Chemistry, Zhejiang University, 38 Zheda Road, Hangzhou, Zhejiang 310027, China
| | - Ya-Ping Tu
- Drug Metabolism and Pharmacokinetics, Infectious Diseases Center of Excellence for Drug Discovery, GlaxoSmithKline, 5 Moore Drive, Research Triangle Park, North Carolina 27709
| | - Kezhi Jiang
- Department of Chemistry, Zhejiang University, 38 Zheda Road, Hangzhou, Zhejiang 310027, China
| | - Yuanjiang Pan
- Department of Chemistry, Zhejiang University, 38 Zheda Road, Hangzhou, Zhejiang 310027, China
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Xu G, Huang T, Zhang J, Huang JK, Carlson T, Miao S. Investigation of collision-induced dissociations involving odd-electron ion formation under positive electrospray ionization conditions using accurate mass. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2010; 24:321-327. [PMID: 20049883 DOI: 10.1002/rcm.4393] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Collision induced dissociation (CID) has been extensively used for structure elucidation. CID in the electrospray ionization (ESI) and atmospheric pressure chemical ionization (APCI) modes has been found to generate mostly even-electron fragment ions while it has been occasionally reported to form odd-electron free radical ions. However, the structural requirements and the fragmentation mechanisms for free-radical CIDs have not been well characterized in the literature. For this purpose, we studied a series of aromatic and non-aromatic compounds such as sulfonamides, N-aryl amides, tert-butyl-substituted aromatic compounds, aryl alkyl ethers, and O-alkyl aryl oximes using the LTQ and LTQ Orbitrap linear ion trap mass spectrometers. The accurate measurement of the fragment ion masses established the unambiguous assignment of the fragment structures resulting from the test compounds. Our results showed that free radical fragmentation is structure dependent and is to a large extent correlated with the neighboring groups in the structures that stabilize the newly formed free radical ions.
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Affiliation(s)
- Guifen Xu
- Department of Pharmacokinetics and Drug Metabolism, Amgen Inc., South San Francisco, CA 94080, USA
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Jian W, Yao M, Zhang D, Zhu M. Rapid Detection and Characterization of in Vitro and Urinary N-Acetyl-l-cysteine Conjugates Using Quadrupole-Linear Ion Trap Mass Spectrometry and Polarity Switching. Chem Res Toxicol 2009; 22:1246-55. [DOI: 10.1021/tx900035j] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Wenying Jian
- Bioanalysis and Discovery Analytical Research and Biotransforamtion, Pharmaceutical Research and Development, Bristol-Myers Squibb, Princeton, New Jersey 08543
| | - Ming Yao
- Bioanalysis and Discovery Analytical Research and Biotransforamtion, Pharmaceutical Research and Development, Bristol-Myers Squibb, Princeton, New Jersey 08543
| | - Duxi Zhang
- Bioanalysis and Discovery Analytical Research and Biotransforamtion, Pharmaceutical Research and Development, Bristol-Myers Squibb, Princeton, New Jersey 08543
| | - Mingshe Zhu
- Bioanalysis and Discovery Analytical Research and Biotransforamtion, Pharmaceutical Research and Development, Bristol-Myers Squibb, Princeton, New Jersey 08543
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