Components Comparison of Essential Oil Extracted from Schisandrae Sphenantherae Fructus by Supercritical Fluid CO_2 Extraction and Steam Distillation

Objective To compare the different chemical constituents of essential oil from Schisandrae Sphenantherae Fractus extracted by supercritical ?uid CO2 extraction(SFE-CO2) and steam distillation(SD).Methods The orthogonal test was carried out to determine the optimal extraction conditions according to the yield of essential oil extracted by SFE-CO2.The SFE-CO2 and SD were used to extract essential oil which was identified by GC-MS.Results The optimal SFE-CO2 extraction conditions were as follows: The extraction temperature was 40 ℃,with extraction pressure 15 Mpa and extraction time 3 hours.The average extraction rate of the essential oil by SFE-CO2 and SD were 8.2 % and 1.4 %,and 16 and 24 components were identified by GC-MS analysis,respectively.Conclusion The results indicated that the average extraction rate of essential oil by SFE-CO2 was higher than that by SD,and both the components and content of the oil were different.