Six new triterpenoid glycosides called julibrosides A1-A4,B1 and C1 were isolated from Albizziae Cortex, the dried stem bark of Albizzia julibrissin DURAZZ. Their structures were determined based on spectral and chemical evidence. Julibrosides B1 and C1 had new sapogenols, designated julibrogenin B and C, respectively, while julibrosides A3 included N-acetyl-D-glucosamine as a sugar component.
N-acetyl-d-glucosamine, Leguminosae, oleanene glycoside, Albizziae Cortex, Albizzia julibrissin, oleanene sapogenol, julibrogenin, julibroside
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E-Senegasaponins a, b, and c were isolated from Senegae Radix, the root of Polygala senega L. var. latifolia TORREY et GRAY, together with their Z-isomers of the 4"-methoxycinnamoyl moiety, Z-senegasaponins a, b, and c. The structures of E-senegasaponins a and b and Z-senegasaponins a and b have been elucidated on the basis of chemical and physicochemical evidence, and the geometrical isomeric structure of the 4"-methoxycinnamoyl group in each saponin was found to show tautomer-like behavior in methanol solution or under irradiation with fluorescent lamps. E and Z-Senegasaponins a and b were found to exhibit potent inhibitory effects on alcohol absorption and hypoglycemic activity in the oral D-glucose tolerance tests in rats, and some structure-activity relationships of the acylated bisdesmoside-type saponins were clarified.
hypoglycemic activity, Polygala senega var. latifolia, E-senegasaponin, Z-senegasaponin, Senegae Radix, alcohol absorption inhibitor
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