本实验采用超临界CO2萃取技术从冻干洋葱粉中萃取挥发油.以洋葱挥发油得率为考察指标,经单因素及正交试验,考察了萃取温度、萃取压力、CO2流量、萃取时间4个因素对超临界CO2流体萃取的影响.结果表明萃取压力20 MPa,萃取温度35℃,CO2流量为14 kg/h的条件下萃取2.5h为最佳工艺,洋葱挥发油得率达0.53％.%In this study the supercritical CO2 extracting technology was applied to extract volatile oil from freeze-dried onion powders. Single factor experiment and orthogonal design were used to study the influences of extracting conditions on the yield of volatile oil. The optimum extracting parameters were established with extracting pressure of 20 MPa, extracting temperature of 35 ℃ ,flow rate of CO2 of 14 kg/h and the extracting time of 2.5 h. The optimum technology for supercritical CO2 extraction of volatile oil from freeze-dried onion powders was high efficient, and the yield of volatile oil was up to 0. 53 %.
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