连钱草挥发油的最佳提取工艺研究

目的]优选采用压力共沸精馏装置提取连钱草挥发油的最佳工艺。方法]采用正交试验对连钱草挥发油的提取工艺条件进行优选,以挥发油得率为指标,选用L9（3^4）正交试验表;考察影响挥发油收率的浸泡时间（A）、料液比（B）、提取时间（C）、NaCl浓度（D）4个因素,每个因素取3个水平。结果]连钱草挥发油的最佳提取工艺为浸泡时间6 h,料液比1∶16（g/ml）,提取时间4 h,NaCl浓度为0;在此条件下连钱草精油的得率为0.03%。结论]该方法可靠、快捷,准确度高,可用于连钱草挥发油的提取。

Study on the Extraction Technology of Essential Oils from Glechoma longituba (Nakai) Kupr

Objective] To confirm the optimum extraction technology of essential oils from Glechoma longituba(Nakai)Kupr on a pressure azeotropic distillation device.Method] Taking the yield of essential oils as index,L9(34) orthogonal test designed with 4 factors including soaking time(A),solid-liquid ratio(B),extraction time(C) and NaCl concentration(D) each of 3 levels was carried out to optimize the extraction technology of essential oils from Glechoma longituba(Nakai)Kupr.Results] The optimum technology for extracting essential oils from Glechoma longituba(Nakai)Kupr was a combination of 6 h soaking time,1∶ 16 solid-liquid ratio,4 h extraction time and 0 NaCl concentration,under which the yield of essential oils could reach 0.03%.Conclusion] The method was reliable,rapid and accurate,which could be used to extract essential oils from Glechoma longituba(Nakai)Kupr.