苦楝果实中某些化学成分及其对菜青虫的生物活性

采用生物活性追踪法，从苦谏(Melia azedarach)果实中分得苦楝新醇(I)、苦谅酮(II)苦楝醇(III)、苦楝二醇(IV)，苦楝三醇(V)、香草酸(VI)、香草醛(VII)和川楝素(VIII)。根据波谱(1R，MS，¹H-NMR，¹³C-NMR)分析和理化常数测定确定其结构，其中I为一新化合物。生测结果表明，II-V和VIII对菜青虫(Pieris rapae)有明显的拒食活性，VIII还表现出明显的胃毒活性；I、VI和VII仅表现出一定的拒食活性。

THE TOXIC CHEMICAL FACTORS IN THE FRUITS OFMELIA AZEDARACH AND THEIR BIO-ACTIVITIESTOWARD PIERIS RAPAE

elianoninol, melianone, melianol, meliandiol, meliantriol, vanillic acid, vanllinand toosendanin have been isolated from the fruits of chinaberry Melia azedarach.Meiianoninol is a newly discovered compound. Their biological acivities toward thecabbage worm Pieris rapae were studied. It was found that the triterpenes melianone, melianol, meliandiol, meliantriol and toosendanin possessed strong antifeedantactivities against the cabbage worm and only toosendanin showed considerable stomach toxicity to the test insect. The bio-activities of melianoninol, vanillic acid andvanillin were much lower than the other compounds.