A study of characteristic fragmentation of isoflavonoids by using negative ion ESI-MSn |
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Authors: | Ablajan Keyume |
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Institution: | College of Chemistry and Chemical Engineering, Xinjiang University, 830046 Urumqi, PR China. ablajan209@hotmail.com |
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Abstract: | Isoflavone mono‐O‐glycosides were investigated by electrospray ionization tandem mass spectrometry with a quadrupole linear ion trap mass spectrometer in negative ion mode. Isoflavonoids having different positions of glycosylation or methylation were differentiated according to the relative abundances of Y0? and Y0? H]?? ions generated from the M ? H]? ion. It is found that the site of glycosyl or methyl group significantly affects relative abundances of the Y0? and Y0? H]?? ions. In addition, the characteristic ion Y0? 2H]? was observed in the product ion spectrum of genistein 7‐O‐β‐D ‐glucoside and was also detected, together with the Y0? CH3]?? and Y0? H ? CH3]? ions in the product ion spectra of glycitin and 6‐methoxy genistein 7‐O‐β‐D ‐glucoside. The structures of isoflavonoids can be characterized and identified according to the formation of these diagnostic ions. The results obtained from this investigation can promote the rapid identification of isoflavonoids in crude plant extracts. Copyright © 2010 John Wiley & Sons, Ltd. |
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Keywords: | isoflavonoid characteristic fragmentation negative ion electrospray ionization tandem mass spectrometry |
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