A fragmentation study of isoflavones in negative electrospray ionization by MSn ion trap mass spectrometry and triple quadrupole mass spectrometry
This study has elucidated the fragmentation pathway for deprotonated isoflavones in electrospray ionization using MSn ion trap mass spectrometry and triple quadrupole mass spectrometry. Genistein‐d4 and daidzein‐d3 were used as references for the clarification of fragment structures. To confirm the...
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Published in | Rapid communications in mass spectrometry Vol. 21; no. 6; pp. 857 - 868 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Chichester, UK
John Wiley & Sons, Ltd
01.01.2007
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Subjects | |
Online Access | Get full text |
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Summary: | This study has elucidated the fragmentation pathway for deprotonated isoflavones in electrospray ionization using MSn ion trap mass spectrometry and triple quadrupole mass spectrometry. Genistein‐d4 and daidzein‐d3 were used as references for the clarification of fragment structures. To confirm the relationship between precursor and product ions, some fragments were traced from MS2 to MS5. The previous literature for the structurally related flavones and flavanones located the loss of ketene (C2H2O) to ring C, whereas the present fragmentation study for isoflavones has shown that the loss of ketene occurs at ring A. In the further fragmentation of the [MHCH3]−. radical anion of methoxylated isoflavones, loss of a hydrogen atom was commonly found. [MHCH3COB‐ring]− is a characteristic fragment ion of glycitein and can be used to differentiate glycitein from its isomers. Neutral losses of CO and CO2 were prominent in the fragmentation of deprotonated anions in ion trap mass spectrometry, whereas recyclization cleavage accounted for a very small proportion. In comparison with triple quadrupole mass spectrometry, ion trap MSn mass spectrometry has the advantage of better elucidation of the relationship between precursor and product ions. Copyright © 2007 John Wiley & Sons, Ltd. |
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Bibliography: | ark:/67375/WNG-Z7M7748C-3 istex:8E8342F80B61D09F64797C6DB431BB67D62636B8 ArticleID:RCM2897 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0951-4198 1097-0231 |
DOI: | 10.1002/rcm.2897 |