Isoflavonoids in the Roots of Thermopsis fabacea D. C. (Leguminosae)

Abstract

Nine isoflavonoids (I—IX) were isolated from the roots of Thermopsis fabacea D. C. (Leguminosae). The methanol extract afforded formononetin (I) and daidzein (II), the ethereal extract afforded trifolirhizin (III), dl-maackiain (IV), genistein (V), and 7,3′-dihydroxy-4′-methoxyisoflavone (VI), and the ethyl acetate extract afforded formononetin-7-0-β-d-glucoside (VII), daidzin (VIII), and genistin (IX). These compounds were identified by means of degradation, spectroscopic studies, and direct comparison with authentic samples. © 1980, The Pharmaceutical Society of Japan. All rights reserved.