Study on Characteristic Component of Ginger Oil Extracted with Supercritical CO_2

[Objective] The study purposed to optimize the technological conditions and heighten the extraction rate of ginger oil.[Method] The ginger oil was extracted from dry ginger with supercritical fluid CO2 extraction(SFE-CO2), the effect of soaking time,the gas flow rate,temperature,pressure and particle diameter of powder during sampling on the extraction rate of ginger oil was studied through single factor test,the technological conditions were optimized and ginger oil components were analyzed by GC.[Result] The characteristic component in ginger ginger oil was obtained with SFE-CO2 extraction,its optimized technological conditions were that the extraction temperature was 50 ℃,extraction pressure was 14.9 MPa,the particle diameter of powder was 0.178 mm,extraction soaking time of the secondary reactor was 2 h and the gas flow rate was 0.30-0.90 L/min during sampling.The ginger oil extraction rate was the highest by SFE-CO2 extraction in aforesaid technological conditions.[Conclusion] The GC analysis result of ginger oil showed that the ginger oil extracted with SFE-CO2 extraction was reddish brown clear liquid and a mixture composed by over 60 ingredients,which could be divided into 4 sorts according to the molecular structure of each component,they were: monoterpenoids,monoterpenoids oxides,sesquiterpene and sesquiterpene oxides resp.