Chemical Ionization Mass Spectrometry of Flavonoids.I.

—5-Hydroxy-6, 7-dimethoxyflavone-4'-glucosides—

Abstract

Ammonia and isobutane chemical ionization mass spectra of the intact flavone glycosides are described. The protonated molecular ion(MH+) are peaks very weak and glycosidic bond cleavage is observed as the major fragmentation pathway. Consequently, the mass spectra exihibit the protonated aglycone ions as the base peak and the various sugar-derived ions.