Electron impact mass spectrometry sugar derivatives

The development of mass spectrometry (MS) procedures for the study of C-glycosylflavo-noids is particularly significant because of the resistance of the C-glycosidic bond to hydrolysis. It is important, from the structural point of view, to determine the molecular mass and to localize the sugar substituents on the aglycone moiety. This has been achieved in the past by electron impact EI-MS of permethylated derivatives. 

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