Further flavonol glycosides of Embelia schimperi leaves

Abstract

Fractionation of the methanolic extract of Embelia schimperi leaves has led to the isolation of two novel flavonol glycosides. The compounds were characterized as isorhamnetin 3-O-b-galactoysyl (1® 4)-b-galactoside and quercetin 3-O-[a-rhamnosyl (1®2)] [a-rhamnosyl (1® 4)]-a-rhamnoside. Also reported from the same extracts were known compounds quercetin, myricetin, quercetin 3-O-a-rhamnoside, quercetin 3-O-b-glucoside, quercetin 3-O-rutinoside, myricetin 3-O-b-xyloside, isorhamentin 3-O-b-glucoside and myricetin 3-O-b-glucoside. Their structural elucidation was accomplished using spectral measurements and chemical methods.

KEY WORDS: Embelia schimperi, Flavonol glycosides, Isorhamnetin 3-O-b-galactoysyl (1® 4)-bgalactoside, Quercetin 3-O-[a-rhamnosyl (1®2)] [a-rhamnosyl (1® 4)]-a-rhamnoside

Bull. Chem. Soc. Ethiop. 2004, 18(1), 51-57.