title: Flavonol glycosides of Warburgia ugandensis leaves.
abstract: Four new flavonol gycosides: kaempferide 3-O-beta-xylosyl (1-->2)-beta-glucoside, kaempferol 3-O-alpha-rhamnoside-7,4'-di-O-beta-galactoside, kaempferol 3,7,4'-tri-O-beta-glucoside and quercetin 3-O-[alpha-rhamnosyl (1-->6)] [beta-glucosyl (1-->2)]-beta-glucoside-7-O-alpha-rhamnoside, were characterized from a methanolic leaf extract of Warburgia ugandensis. The known flavonols: kaempferol, kaempferol 3-rhamnoside, kaempferol 3-rutinoside, myricetin, quercetin 3-rhamnoside, kaempferol 3-arabinoside, quercetin 3-glucoside, quercetin, kaempferol 3-rhamnoside-4'-galactoside, myricetin 3-galactoside and kaempferol 3-glucoside were also isolated. Structures were established by spectroscopic and chemical methods and by comparison with authentic samples.
authors.affiliation: Nairobi University, Chemistry Department, PO Box 30197, Nairobi, Kenya.
authors.forename: Lawrence O Arot
authors.initials: LO
authors.lastname: Manguro
authors.forename: Ivar
authors.initials: I
authors.lastname: Ugi
authors.forename: Peter
authors.initials: P
authors.lastname: Lemmen
authors.forename: Rudolf
authors.initials: R
authors.lastname: Hermann
mesh_terms: D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification; D044948:Flavonols / Q000737:chemistry* / Q000302:isolation & purification*; D006027:Glycosides / Q000737:chemistry* / Q000302:isolation & purification*; D044949:Kaempferols / Q000737:chemistry / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy; D018515:Plant Leaves / Q000737:chemistry*; D010946:Plants, Medicinal / Q000737:chemistry*; D011794:Quercetin / Q000031:analogs & derivatives / Q000302:isolation & purification; D016339:Spectrometry, Mass, Fast Atom Bombardment
chemical_list: D005419:Flavonoids; D044948:Flavonols; D006027:Glycosides; D044949:Kaempferols; C449720:kaempferide; C006552:kaempferol; C040015:myricetin; D011794:Quercetin