title: Betacyanins from bracts of Bougainvillea glabra.
abstract: Betacyanins from the bracts of Bougainvillea glabra were isolated and characterized by a combination of spectroscopic techniques (DAD-HPLC, NMR, LC-MS, GC-MS, electrospray MS, tandem MS) as gomphrenin I (betanidin 6-O-beta-glucoside) and various derivatives of bougainvillein-v (betanidin 6-O-beta-sophoroside), i.e. mono- and diglucosylsophorosides which are acylated with 4-coumaric and caffeic acid (mono- and diesters). Besides the betacyanins, B. glabra bracts accumulated large amounts of flavonols (kaempferol and quercetin conjugates) reaching ratios of flavonol to betacyanin of 1:1.
authors.affiliation: Institut für Pharmazeutische Biologie, Technischen Universität Braunschweig, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Heuer
authors.forename: S
authors.initials: S
authors.lastname: Richter
authors.forename: J W
authors.initials: JW
authors.lastname: Metzger
authors.forename: V
authors.initials: V
authors.lastname: Wray
authors.forename: M
authors.initials: M
authors.lastname: Nimtz
authors.forename: D
authors.initials: D
authors.lastname: Strack
mesh_terms: D050858:Betalains / Q000737:chemistry / Q000302:isolation & purification*; D002240:Carbohydrate Sequence; D002851:Chromatography, High Pressure Liquid; D004095:Dihydropyridines / Q000737:chemistry / Q000302:isolation & purification*; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification; D044948:Flavonols; D008401:Gas Chromatography-Mass Spectrometry; D006027:Glycosides / Q000737:chemistry / Q000302:isolation & purification; D007211:Indoles / Q000737:chemistry / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry / Q000379:methods; D008969:Molecular Sequence Data; D010944:Plants / Q000737:chemistry*
chemical_list: D004095:Dihydropyridines; D005419:Flavonoids; D044948:Flavonols; D006027:Glycosides; D007211:Indoles; C555523:gomphrenin I; D050858:Betalains