Abstract
Dietary supplements manufactured from red clover are widely marketed to provide the beneficial health effects of isoflavones without changing the original diet. In this study the metabolism of formononetin and biochanin A, the principal isoflavones of red clover, was studied in human subjects. Seven women ingested four red clover dietary supplements, and the metabolites of the isoflavones were identified in their urine samples. The structures of trimethylsilyl derivatives of the metabolites were established by GC-MS. New reduced metabolites of formononetin (dihydroformononetin and angolensin) and biochanin A (dihydrobiochanin A and 6'-hydroxyangolensin) were identified in urine samples using authentic reference compounds. Possible metabolic pathways are presented for the red clover isoflavones formononetin and biochanin A.
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