Study on the difference of essential oil extracted from Artemisia annuain Gansu through supercritical CO2 technology

Essential oil from Artemisia annua was extracted by supercritical fluid CO2 extraction (SFECO2) and water steam distillation (WSD). And the components were analyzed by GCMS. The result indicated that 86 compounds were identified from the essential oil obtained by SFECO2 and the main components were 8,9dehydro9formylcycloisolongifolene (18.22%), (allZ)5,8,11,14,17eicosapentaenoic acid methyl ester (8.39%), etc; 61 compounds were identified from the essential oil obtained by WSD and its main components were 1,3Benzodioxole, 4methoxy6(2propenyl)(24.28%), 2Cyclohexen1ol (17.47%), etc. There were 31 components were same in essential oil through two extraction methods, which accounted for 39.45% and 78.40% of the total integral area while identifying the essential oil. Compared with the traditional steam distillation method, the use of SFECO2 reflected more real and comprehensive chemical components of Artemisia annua.