Metabolism of Quercitrin by Human Intestinal Bacteria and Its Relation to Some Biological Activities.

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Abstract
When quercitrin was anaerobically incubated with human intestinal bacteria, quercetin, 3,4-dihydroxyphenylacetic acid and 4-hydroxybenzoic acid were found as metabolites. The main metabolite was quercetin. The bacterium transforming quercitrin to quercetin was Fusobacterium K-60. However, Bacteroides JY-6, which produced alpha-L-rhamnosidase, did not transform quercitrin to quercetin. Among quercitrin and its metabolites, 3,4-dihydroxyphenylacetic acid and 4-hydroxylphenylacetic acid had more potent activity than quercitrin on in vitro anti-platelet aggregation activity, and quercetin and 3,4-dihydroxyphenylacetic acid showed more potent cytotoxicity against tumor cell lines than quercitrin and 4-hydroxylphenylacetic acid.

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