Study on Volatile Oil Components and Total Anti-oxidation Capacity and Simulated SOD Activity of Leaves from Michelia chapensis and M. fovelata

The volatile oils from leaves of Michelia chapensis Dandy and M. foveolata Merr.ex Dandy were isolated by organic solvent extraction and their components were analyzed and quantified by GC/MS. Then, the total anti-oxidation capacity and simulated SOD activity were tested. Forty-four compounds in M. chapensis were identified and the main constituents are aromatic （11.057%）, ester （5.041%） and terpenoid compounds （19.772%）. Fifty-two compounds in M. foveolata were identified, and their main constituents are aromatic （21.293%）, alcohol （17.403%）, alkene （6.909%）, ester （5.657%） and alkane compounds （5.134%）. The results showed that the two oils have strong anti-oxidation capacity and simulated SOD activity. The total anti-oxidation capacities were the highest when the volatile oil from M. foveolata was diluted by 50 times and that from M.chapensis by 100 times. The simulated SOD activity of volatile oil from M. chapensis was higher than that from M. foveolata, and CuZn-SODs in the two oils held 73%-74% of the total SOD. These results will provide scientific foundation for the exploration of the bioactivity of M. chapensis and M. foveolata.