Further flavonol glycosides of Embelia schimperi leaves

  • Lawrence O. Arot Manguro Nairobi University, Chemistry Department, P.O. Box 30197, Nairobi, Kenya
  • Ivar Ugi Technische Universität München, Institut für Organische Chemie und Biochemie, Lerhstul 1, Lichtenbergstrasse 4, 85747-Graching, Germany
  • Peter Lemen Technische Universität München, Institut für Organische Chemie und Biochemie, Lerhstul 1, Lichtenbergstrasse 4, 85747-Graching, Germany
Keywords: 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

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.
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Articles

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