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-β-glucoside and various derivatives of bougainvillein-v (betanidin 6- O-β-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.
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