超临界CO_2和微波辅助萃取艾叶挥发油工艺的研究

通过超临界CO2萃取均匀设计实验和微波辅助萃取艾叶挥发油的正交实验比较,考察影响提取的主要因素,寻求最佳萃取工艺。超临界CO2萃取最佳工艺条件为:萃取压力16MP,萃取温度31℃,CO2流量20kg/h和时间80min,得率3.75%;微波萃取最佳工艺条件为:辐射功率720w,辐射时间200s,溶剂量400mL,洗涤剂量50mL,得率4.85%。水蒸馏法提取率为1.87%。结果表明超临界CO2和水蒸馏法萃取艾叶挥发油品质最好;微波萃取收率最高,但品质较差。

Extraction technology of the volatile oils from Artemisiae argyi Leaves by supercritical CO2 and microwave

In the paper,the volatile oils from the leaves of Artemisia argyi were obtained with supercritical CO 2 and microwave for their optimum extraction conditions. The uniform design experiment were used to optimize the SFE CO 2 conditions,and the optimal conditions were determined:the pressure of 16MPa,the temperature at 31 ℃,CO 2 flowing rate at 20 kg/h and the time for 80 min. The optimum conditions of the microwave extraction were obtained by orthogonal experiment: radiation time for 200 s,microwave power of 720 w,400 mL solvent,40 mL washing solvent. The volatile oils were obtained by supercritical CO 2,microwave and steam distillation,extraction rate were 3.75%,4.85% and 1.87% respectively. The results showed that the extraction rate of microwave extraction was the highest and its process was simpler,but its quality was worse than the volatile oils extracted by supercritical CO 2 and steam distillation which qualities were better.