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Bioassay-guided fractionation of the active n-BuOH extract of the starfish Culcita novaeguineae resulted in the isolation of three new sulfated steroidal glycosides (asterosaponins) 1, 2 and 3, as active compounds causing morphological abnormality of Pyricularia oryzae mycelia. Compounds 1-3 possess the same pentasaccharide moiety, beta-D-fucopyranosyl-(1→2)-alpha-L-arabinopyranosyl- ( 1 → 4 )-[- beta-D- quinovopyranosyl- ( 1 →2 ) ]-beta-D-xylopyranosyl- ( 1 → 3 )-beta-D-quinovopyranosyl, linked to C-6 of 3beta-sulfated steroidal aglycones and differ from each other in the side chains.  相似文献
2.
Two new sulfated steroidal pentaglycosides (asterosaponins), novaeguinosides Ⅰ (2) and Ⅱ(3), along with the known regularoside B (1) were isolated from the starfish Culcita novaeguineae. Their structures were elucidated by extensive NMR techniques as well as chemical evidence. The new asterosaponins showed marginal in vitro cytotoxicity against two human tumor cell lines.  相似文献
3.
Two new sulfated steroidal pentaglycosides(asterosaponins),novaeguinosides Ⅰ(2) and (Ⅱ)2,along with the known regularoside B(1)were isolated from the starfish Culcita novaeguineae.Their structures were elucidated by extensive NMR techniques as well as chemical evidence.  相似文献
4.
0 引言近年来的免疫学研究发现,不明原因的不育患者体内存在着抗精子抗体(Anti-sperm antibody, ASAb)并对不育产生影响[1,2]. 我院近年来对抗体阳性者进行了中西医结合治疗,有效消除了抗体,取得了较好的临床效果,现报道如下.  相似文献
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