4.7 Article

Biotransformation of common bean (Phaseolus vulgaris L.) flavonoid glycosides by Bifidobacterium species from human intestinal origin

Journal

JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 55, Issue 10, Pages 3913-3919

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/jf062997g

Keywords

beta-glucosidase activity; bifidobacteria; common bean; isoflavones; kaempferol; seed; seedling

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Bifidobacteria strains from human origin were screened for the specific activity (beta-glucosidase activity) involved in the metabolism of dietary flavonoids. Five strains with high beta-glucosidase activity were selected for further metabolism analyses (high-performance liquid chromatography separations) of flavonoid glycosides occurring in Phaseolus vulgaris L. (common bean) seeds and seedlings. All selected strains were found to be active in the conversion of kaempferol 3-O-glucoside, daidzin, genistin, and glycitin into their aglyconic forms. No metabolites were detected after the fermentation tests with the diglucosidic compound kaempferol 3-O-xylosylglucoside. In addition, to verify the effective bioavailability of flavonoid aglycones, the degradation rates of daidzein, genistein, glycitein, and kaempferol, following incubation with selected strains, were monitored. The results showed that the five selected strains of bifidobacteria, being active in the biotranformation of flavonoid glycosides occurring in common bean seeds and seedlings, could be considered as probiotic dietary adjuncts to improve the nutritional and health properties of flavonoid-based products, comprising hypothetical common bean food derivatives.

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