False sugar sequence phenomenon and structural analysis of a-hederin and hederacoside C through electrospray ionization and multi-stage tandem mass spectrometry

ABSTRACT: Saponins are glycosides regularly found in plants, and they are frequently analyzed by means of electrospray ion sources and tandem mass spectrometry (ESI/MSn), not only to obtain an overall molecular weight through the high sensitivity of mass spectrometry, but also to obtain their struct...