Abstract
Quercetin 3,7,4′- O- β-triglucopyranoside together with quercetin, quercetin 4′- O- β-glucopyranoside and quercetin 3,4′- O- β-diglucopyranoside were isolated from the pigmented scales of Allium cepa var. ‘Red Baron’. The former flavonol has previously been reported to be formed when cell cultures of a Vitis hybrid is fed with quercetin. Minor amount of taxifolin 4′- O- β-glucopyranoiside, a rare dihydroflavonol, was also detected. The structures were established on the basis of acid hydrolysis, chromatography (TLC and HPLC) and homo- and heteronuclear NMR spectroscopic techniques.
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