Molluscicidal steroidal saponins and lipid content of Agave decipiens

被引:18
作者
Abdel-Gawad, MM [1 ]
El-Sayed, MM [1 ]
Abdel-Hameed, ES [1 ]
机构
[1] Theodor Bilharz Res Inst, Med Chem Lab, Giza, Egypt
关键词
Agave decipiens; steroidal saponins; molluscicidal activity; hydrocarbons; sterols; fatty acids;
D O I
10.1016/S0367-326X(99)00057-X
中图分类号
R914 [药物化学];
学科分类号
100701 ;
摘要
GLC analysis of the petrol extract of the leaves of Agave decipiens revealed that n-hexacosane was the main hydrocarbon, beta-sitosterol the main sterol and oleic acid the main fatty acid. Two spirostanol and two furostanol saponins have been isolated from the methanolic extract. The structures of these saponins were established as 3-O-alpha-L-rhamnopyranosyl-(1 --> 2)-[alpha-L-rhamnopyranosyl-(1 --> 4)]-beta-D-glucopyranosyl-26-O-beta-D-glucopyranosyl-22 alpha-methoxy-(25R)-furost-5-ene-3 beta,26-diol (1), neoruscogenin 1-O-beta-D-glucopyranosyl-(1 --> 3)-[alpha-L-rhamnopyranosyl-(1 --> 2)]-beta-D-glucopyranosyl-(1 --> 4)-beta-D-galactopyranoside (2), 1-O-alpha-L-rhamnopyranosyl-(1 --> 2)-[alpha-L-rhamnopyranosyl-(1 --> 4)]-beta-D-glucopyranosyl-26-O-beta-D-glucopyranosyl-22-O-methylfurasto-5,25(27)-diene-1 beta,3 beta,22,26-tetraol (3) and neohecogenin 3-O-beta-D-glucopyranosyl-(1 --> 3)-[beta-D-xylopyranosyl-(1 --> 3)-beta-D-xylopyranosyl-(1 --> 2)]-beta-D-glucopyranosyl-(1 -, 4)-P-D-galactopyranoside (4). Saponins 2 and 4 showed high molluscicidal activity against B. alexandrina snails (LC90 = 13 and 6 ppm, respectively), whereas saponins 1 and 3 were inactive up to 50 ppm. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:371 / 381
页数:11
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