Bioactive Saponins and Glycosides. II. Senegae Radix. (2) : Chemical Structures, Hypoglycemic Activity, and Ethanol Absorption-Inhibitory Effect of E-Senegasaponin c, Z-Senegasaponin c, and Z-Senegins II, III, and IV

抄録

Following the characterization of E-senegasaponins a and b and Z-senegasaponins a and b, new bioactive saponins named E-senegasapinin c and Z-senegasapinin c were isolated from Senegae Radix, the root of Polygala senega L. var. latifolia TORREY et GRAY., together with Z-senegins II, III, and IV. The chemical structures of E and Z-senegasaponins c and Z-senegins II, III, and IV were elucidated on the basis of chemical and physicochemical evidence, and the geometrical isomerc structures of the 4''-methoxycinnamoyl and 3'', 4''-dimethoxycinnamoyl groups in these saponins were found to show tautomer-like behavior under irradiation with fluorescent lamps.E and Z-Senegasaponins c and E and Z-senegins II, III, and IV were found to exhibit hypoglycemic activity in the oral D-glucose tolerance test. (E) and (Z)-Senegins II also showed an inhibitory effect on alcohol absorption in rats.