从萃取的压力、温度、流量和时间等条件探讨超临界 CO2萃取对鱼腥草(Houttuynia cordata Thunb .)挥发油萃取
率的影响, 确定最佳萃取条件为萃取压力20 mPa、温度 35℃、CO2流量40 kg h 和萃取时间 80 min, 鱼腥草挥发油得率
为1 .76%。 而水蒸气蒸馏提取和石油醚提取的得率分别为 0.05%和 0.08%。 超临界 CO2法萃取的鱼腥草挥发油
收率高, 萃取时间短。
 

The effects of the pressure , temperature, CO2 flowing rate and extracting time to the extraction rate of the volatile oil of Houttuynia cordata Thunb .by supercritical CO2  extraction were researched .The optimal extracting conditions were the pressure 20 mPa, temperature 35 ℃, CO2 flowing rate 40 kg h and the extracting time 80 min .The extraction rates of volatile oils obtained with supercritical CO2 , steam distillation and etroleum ether extraction were 1 .76 %, 0 .05 % and 0 .08 % respectively .The results showed that the extracting rate of the supercritical CO2 extraction is the highest and extracting time is the shortest .