Optimization of Supercritical Carbon dioxide Extraction of Ginger Essential Oil by Response Surface Method
[Objective] Ginger essential oil (GEO) is widely used in food production and medical field in recent years due to its prominent biological functions,and this study was conducted to obtain high-quality and high-purity ginger essential oil from the fresh ginger.[Method] GEO was extracted from ginger roots by supercritical fluid extraction (SFE) method.The effects of flow rate of CO2,mesh size of ginger powder and volume of entrainer were investigated by single-factor experiments and response surface method.The content and extraction rate of 6-gingerol represented the extraction index of GEO.[Result] The conditions were optimized as follows:flow rate of CO2 at 25 L/h,mesh size of ginger power of 80 mesh,and volume of anhydrous ethanol as entrainer of 92.46 ml.The optimal extraction rate of 6-gingerol was 3.21％,which was predicted by RSM.[Conclusion] The optimal process of supercritical carbon dioxide extraction of ginger essential oil was identified by singlefactor experiments and response surface method.The present study provides a satisfactory method for purifying GEO from ginger for industrial purpose.
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