目的 对毛排钱草地上部分的化学成分及其抗肿瘤活性进行研究。方法 对干燥的毛排钱草地上部分以甲醇于50℃下萃取浓缩,以水溶解滤过得水溶及水不溶性两部分,水可溶部分用正丁醇提取化合物。通过波谱解析、对照品比较及与文献报道对比鉴定其化学结构。并对得到的化合物进行了细胞毒活性研究。结果 正丁醇提取物分离纯化后得到8个化合物。经鉴定为N,N-二甲基色胺(Ⅰ)、5-甲氧基-N,N-二甲基色胺(Ⅱ)、柠檬酚(Ⅲ)、异柠檬酚(Ⅳ)、(Z)-1-(4-羟基-2,3-二甲氧苯基)-3-(4-羟基苯)丙烯(Ⅴ)、(Z)-1-(3-羟基-2,4-二甲氧苯基)-3-(4-羟基-3-甲氧基苯基)丙烯(Ⅵ)、原儿茶酸甲酯(Ⅶ)、香橙素[(2R,3R)-2,3-二氢-3,5,7-三羟基-2-(4-羟基苯基)-4H-1-苯并吡喃-4-酮,Ⅷ]。结论 8个化合物均为首次从该植物中分得,在MTT 抗肿瘤实验中,化合物Ⅰ、Ⅲ-Ⅵ均具有一定的细胞毒活性。

Objective To investigate the chemical constituents in Desmodium blandum and their antitumor bioactivity.Methods Various chromatographic techniques were employed for the isolation and purification of the constituents by butanol at 50℃ including silica gel, Sephadex L H-20.The compounds structures were elucidated by spectral analyses(IR,UV,NMR,and MS).Then their cytotoxic activity was studied.Results They were identified as N,N-dimethyltryptamine (Ⅰ),5-methoxy-N,N-dimethyltryptamine(Ⅱ),citrusinol(Ⅲ),yukovanol(Ⅳ),(Z)-1-(4-hydroxy-2,3-dimethoxyphenyl)-3-(4-hydroxyphenyl) propene(Ⅴ),(Z)-1-(3-hydroxy-2,4-dimethoxy phenyl)-3-(4-hydroxy-3-methoxy-phenyl) propene(Ⅵ),methyl protocatechuate(Ⅶ),katuranin(Ⅷ).Conclusion Eight compounds are isolated from the stems of D. blandum for the first time.In the MTT antitumor experiments,compounds Ⅰ and Ⅲ-Ⅵ have the cytotoxic activity to KB cell.

浙江省自然科学基金项目(Y106725,Y4080023);宁波市自然科学基金项目(2008A610048,2008A610072,2008A610043和2008C50014)