Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 51, Issue 27, Pages 7879-7883Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf0304324
Keywords
Phaseolus vulgaris; antioxidants; extracts; condensed tannin fractions; anthocyanins; flavonols
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Twelve different seed coat color genotypes of Phaseolus vulgaris L. were extracted and pure flavonoids isolated from 10 of these. The seed coat methanol extracts, tannin fractions, and pure flavonoids all displayed antioxidant activity in a fluorescence-based liposome assay. The relatively high activity of the condensed tannin (proanthocyanidin) fractions indicates that these may play an important role in the overall activity of the extracts. This activity also indicates that although these polyphenols cause problems in digestibility, they may be important dietary supplements with beneficial health effects. The pure anthocyanins delphinidin 3-O-glucoside (1), petunidin 3-O-glucoside (2), and malvidin 3-O-glucoside (3) and the flavonol quercetin 3-O-glucoside (4) isolated from seed coats also had significantly higher antioxidant activity than the Fe2+ control. The activity of kaempferol 3-O-glucoside (5) was not different from that of the Fe2+ control. These findings suggest that variously colored dry beans may be an important source of dietary antioxidants.
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