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Dai D, Zhu Y, Zhu Z, Qian R, Zhuo S, Liu A, Li X, Li W, Chen Q. Studies of Dopamine Oxidation Process by Atmospheric Pressure Glow Discharge Mass Spectrometry. Molecules 2023; 28:molecules28093844. [PMID: 37175253 PMCID: PMC10179796 DOI: 10.3390/molecules28093844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Revised: 04/23/2023] [Accepted: 04/27/2023] [Indexed: 05/15/2023] Open
Abstract
An atmospheric pressure glow discharge ionisation source was constructed and utilized to study the dopamine (DA) oxidation process coupling with mass spectrometry. During the DA oxidation process catalysed by polyphenol oxidase (PPO), six cationic intermediates were directly detected by the atmospheric pressure glow discharge mass spectrometry (APGD-MS). Combined with tandem mass spectrometry, the structures of the dopamine o-semiquinone radical (DASQ) and leukodopaminochrome radical (LDAC●) intermediates and structures of the isomers of dopaminochrome (DAC) and 5,6-dihydroxyindole (DHI) were further characterised with the introduction of 2,2,6,6-tetramethylpiperidine 1-oxyl (TEMPO) and deuterium oxide (D2O) to APGD-MS. Meanwhile, UV-Vis studies confirmed the important role of PPO in catalyzing the DA oxidation reaction. Based on APGD-MS studies, a possible mechanism could be proposed for DA oxidation catalysed by PPO. Furthermore, APGD-MS could provide possibilities for the effective detection and characterisation of short-lived intermediates, even in complicated systems.
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Affiliation(s)
- Dongli Dai
- National Center for Inorganic Mass Spectrometry in Shanghai, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
- School of Material and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yueqin Zhu
- National Center for Inorganic Mass Spectrometry in Shanghai, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhenli Zhu
- State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China
| | - Rong Qian
- National Center for Inorganic Mass Spectrometry in Shanghai, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shangjun Zhuo
- National Center for Inorganic Mass Spectrometry in Shanghai, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Anqi Liu
- National Center for Inorganic Mass Spectrometry in Shanghai, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xian Li
- National Center for Inorganic Mass Spectrometry in Shanghai, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wei Li
- School of Material and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Qiao Chen
- Department of Chemistry, School of Life Sciences, University of Sussex, Brighton BN1 9QJ, UK
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Liang X, Guo Z, Yu C. Fragmentation pathways of 2-substituted pyrrole derivatives using electrospray ionization ion trap and electrospray ionization quadrupole time-of-flight mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2013; 27:2272-2278. [PMID: 24019193 DOI: 10.1002/rcm.6676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2013] [Revised: 07/03/2013] [Accepted: 07/04/2013] [Indexed: 06/02/2023]
Abstract
RATIONALE Pyrrole derivatives are of considerable importance and are present in a wide range of natural products and used extensively in drug discovery. Fragmentation pathway studies play an important role in the structural identification of pyrrole derivatives. As a part of our ongoing work on heterocycles, fragmentation pathways of 2-substituted pyrrole derivatives were investigated by mass spectrometry (MS). METHODS Twelve pyrrole derivatives were synthesized and analyzed. Low-resolution fragmentation ions of all the compounds were generated by ion trap mass spectrometry (ITMS(n) ) with an electrospray ionization (ESI) source in positive mode. Hybrid quadrupole time-of-flight mass spectrometry (QTOFMS) was used to determine the elemental compositions of the resultant product ions. RESULTS The side-chain substituents at the 2-position influence the fragmentation pathways. Typical losses of H2 O, aldehydes and pyrrole moieties from the [M + H](+) ion are observed for the compounds with side chains bearing aromatic groups at the 2-position of the pyrrole. However, losses of H2 O, alcohols and C3 H6 are the main cleavage pathways for compounds 6 and 12 with nonphenyl-substituted side chains at the 2-position. CONCLUSIONS Typical fragmentation mechanisms of 2-substituted pyrrole derivatives are proposed and elucidated based on the observations of ITMS(n) and QTOFMS spectra. The results showed that the fragmentation pathways were remarkably influenced by the side-chain substituents at the 2-position of pyrrole. This investigation should have value in the structural identification of this series of molecules or compounds with similar structures.
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Affiliation(s)
- Xianrui Liang
- Key Laboratory for Green Pharmaceutical Technologies and Related Equipment of Ministry of Education, College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou, 310014, P.R. China
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Barroso B, Bischoff R. LC-MS analysis of phospholipids and lysophospholipids in human bronchoalveolar lavage fluid. J Chromatogr B Analyt Technol Biomed Life Sci 2005; 814:21-8. [PMID: 15607704 DOI: 10.1016/j.jchromb.2004.07.044] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2004] [Accepted: 07/15/2004] [Indexed: 11/22/2022]
Abstract
A reversed phase HPLC method was developed for the simultaneous analysis of different phospholipids and lysophospholipids in human bronchoalveolar lavage fluid (BALF). Separation was achieved using a pellicular C8 column at elevated temperatures with an increasing gradient of acetonitrile containing 0.1% formic acid. Detection was carried out by electrospray ionization ion-trap mass spectrometry. Calibration graphs for selected phospholipids (phosphatidylcholine, phosphatidylethanolamine, phosphatidylglycerol and lysophosphatidylcholine) showed linearity up to 50 ng allowing quantitative determinations. Identification of the individual species within each class was possible with tandem mass spectrometry. Analysis of BALF phospholipids was performed after liquid/liquid extraction with a mixture of chloroform/methanol/acetic acid. Recoveries ranged from 69 to 97% with standard deviations of less than 6%. The limit of detection varied slightly between different classes but was in the range 0.05-0.25 ng total injected amount.
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Affiliation(s)
- Begona Barroso
- Center of Pharmacy, Bioanalysis and Toxicology, University of Groningen, Antonius Deusinglaan 1, 9713AV Groningen, The Netherlands.
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Yuan G, Tang F, Zhu CJ, Liu Y, Zhao YF. Fragmentation mechanisms of polyamides containing N-methylpyrrole and N-methylimidazole by electrospray ionization tandem mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2003; 17:2015-2018. [PMID: 12913865 DOI: 10.1002/rcm.1126] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
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Tang F, Wang J, Liu D, Yuan G, Liu Y, Jin Zhu C, Fen Zhao Y. Electrospray ionization tandem mass spectrometric characteristics and fragmentation mechanisms of distamycin analogues. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2002; 16:1035-1039. [PMID: 11992504 DOI: 10.1002/rcm.680] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The electrospray ionization tandem mass spectrometric (ESI-MS/MS) characteristics and fragmentation mechanisms of eight distamycin analogues containing N-methylpyrrole and N-methylimidazole were investigated. The members of two isomeric groups of distamycin analogues with the same elemental composition can be distinguished by MS/MS spectra of protonated molecules and of significant fragment ions.
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Affiliation(s)
- Feili Tang
- Department of Chemical Biology, The Key Laboratory of Bioorganic Chemistry and Molecular Engineering, Ministry of Education, College of Chemistry, Peking University, Beijing 100871, PR China
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Current literature in mass spectrometry. JOURNAL OF MASS SPECTROMETRY : JMS 2001; 36:1076-1082. [PMID: 11599087 DOI: 10.1002/jms.96] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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