摘要：

The extracts from leaves of Manglietia insignis (Wall) Blume,Manglietia chingii Dandy and Manglietia yuyuanensis Law were prepared by organic solvent extraction and their components were analyzed by GC/MS and quantified. Meanwhile,the free radicals re-straining activities were detected. The 21 compounds in M. insignis,36 compounds in M. chigii and 20 compounds in M. yuyuanensis were identified. There were 11 common components in the extracts from three Manglietia species,and 12 components in two Manglietia species. The results of relative contents of every component in three extracts showed that the main constituents of M. insignis were terpenoids and alkene,amounting to 38.93%,followed by alkane (28.18%),the nitrogen containing compounds (15.73%) and aromatic compounds (7.23 %). The main constituents of leaf extract from M. chingii were the terpenoids and alkene,carboxylic acid,alkane and aromatic compounds,amounting to 30.22%,14.17%,13.87% and 13.29%,respectively. The main constituents of M. yuyuanensis were alcohol compounds,the terpenoids and alkene,and aromatic compounds,amounting to 28.00%,25.38% and 18.00% respectively. The results showed that the three extracts had strong function of restraining oxygen free radicals. The ultra oxygen anions activity was restrained at the highest level,when the three extracts were diluted by hundred-fold,whereas the restraining capacity of hydroxyl free radicals reached maximum,when the three extracts were diluted by twenty-fold. The above results provide scientific evidences for further approaching the ecological healthy function of three Manglietia species

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