[Studies on the active constituents of Anemarrhena asphodeloides bunge]

From the ethanol extract of the Anemarrhena asphodeloides Buge (Liliaceae), a new steroidal suponin anemarsaponin B and two known saponins anemarsaponin A1 and A2 were isolated. On the basis of chemical evidences and spectral analysis (UV, IR, EI-MS, FAB-MS, 1H-NMR and 13C-NMR), the structure of anemarsaponin B was elucidated as 26-O-beta-D-glucopyranosylfurost-20(22)-ene-3 beta,26-diol-3-O-beta-D- glucopyranosyl(1----2)-beta-D-galactopyranoside. Preliminary pharmacological tests showed that anemarsaponin B could inhibit PAF-induced rabbit platelet aggregation in vitro.