以硅胶纯化后的香根油提取率为指标,对超声辅助萃取过程的影响因素进行研究.在单因素试验基础上进行响应面法Box-Behnken试验设计,得出各因素对香根油提取率影响程度的排序为:料液比>超声温度>超声时间,且料液比和超声温度2个因素的交互作用较为显著.当以无水乙醇为溶剂,香根草粒径80目~100目,料液比1 :12(g/mL),超声时间35 min,超声温度68℃,香根油提取率为3.21 %.通过气相色谱-质谱联用法对香根油进行了成分分析,共鉴定出22种化合物,占总萃取物的76.96 %.%The oil of vetiveria was extracted by ultrasonic assisted organic solvent extraction, and the yeild of vetiver oil after silica gel was used as an index. Based on the single factor experiment, the response surface method Box-Behnken experiment design was carried out, and the order of the factors affecting the yield of the vetiver oil was the ratio of material to liquid > ultrasonic temperature > ultrasonic time and the interaction between the ratio of material to liquid and ultrasonic temperature is more significant. When the ethanol was used as the extraction solvent, the particle size was 80mesh -100mesh, the ratio of material to liquid was 1 : 12(g/mL),the ultrasonic time was 35 min, the ultrasonic temperature was 68 ℃. Under this condition, the yield of the vetiver oil was 3.21 %. The chemical composition of the essential oil was analyzed by GS-MC. A total of 22 compounds which accounted for 76.96 % of the total extract were identified.
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