牛蒡根挥发油超临界CO_2萃取的工艺研究

Technology for volatile oil extraction from the root of Arctium Lappa L. using supercritical carbon dioxide

目的:对超临界CO2流体萃取牛蒡根挥发油的工艺条件进行研究。方法:通过单因素试验研究萃取温度、萃取压力、萃取时间对萃取率的影响,并采用正交试验设计优化工艺条件。结果:最佳萃取条件为萃取温度45℃、萃取压力25 MPa、萃取时间1.5 h,在此条件下,超临界CO2流体萃取牛蒡根挥发油的萃取率为2.92%。结论:超临界CO2流体萃取牛蒡根挥发油具有较高的萃取率,最佳条件为萃取温度45℃、萃取压力25 MPa、萃取时间1.5 h,且萃取温度对萃取率有显著影响。

Objective： To study the technology for extracting volatile oil from the root of Arctium Lappa L. using supercritical carbon dioxide. Methods ： By single factor test, the effects on the yield were examined concerning the extraction temperature, pressure and time. Orthogonal experiment was used to optimize the extraction technology. Results ： The optimal temperature was 45 ℃ ,pressure at 25 MPa and duration for 1.5 h. Such conditions had led to a yield of volatile oil by 2.92%. Conclusion ： Extraction of volatile oil from root of Arctium Lappa L. using supercritical carbon dioxide can be productive under the optimum conditions described above. Of the three factors, extraction temperature may greatly affect the extraction yield of volatile oil.