Flavonol glycosides from Vernonia galamensis ssp. nairobiensis

Article abstract of DOI:10.1016/0031-9422(96)00252-X

A new flavonol glycoside has been isolated from the leaves of Vernonia galamensis ssp. nairobiensis. Its structure has been established as isorhamnetin 3-O-β-D-apio-D-furanosyl(1 → 2)-β-D-galactopyranoside on the basis of spectral data (UV, ¹H and ¹³C NMR, D/CIMS) and by acid hydrolysis. Characterization of the peracetate derivative confirmed the configuration of the apiosyl moiety. In addition, the known flavonol glycosides; quercetin 3-galactoside, quercetin 3-apiosyl(1 → 2)galactoside and quercetin 3-rhamnosyl(1 → 6)galactoside have been isolated and identified.