Abstract

□ Analysis of urinary metabolites of orally administered rutin (I) labeled with deuterium ([2′,5′,6′-2H]rutin, rutin-d) was carried out by GLC-MS. In rat urine, 3-hydroxyphenylacetic acid (III), 3-me- thoxy-4-hydroxyphenylacetic acid (IV), 3,4-dihydroxyphenylacetic acid (V), 3,4-dihydroxytoluene (VI), and 3-(m-hydroxyphenyl)propionic acid (VIII) were identified as rutin metabolites and were differentiated from the corresponding endogeneous compounds. Unchanged I and quercetin (II) were not present in the urine. Rutin-d was injected intraperitoneally in rats, administered orally to neomycin-treated rats, and incubated in vitro with the intestinal contents of rats. The experiments suggested the involvement of intestinal microflora in the metabolism of orally administered I.

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