微波辅助提取甘草黄酮的研究

Study of Microwave-assisted extraction on flavonoids of Radix Glycyrrliza

目的 :寻找微波辅助提取甘草黄酮的最佳条件 ,并对微波辅助提取法和水提法进行对比研究。方法 :采用微波辅助提取法和水提法提取甘草黄酮 ,并用 4因素、1 6水平的均匀设计考察及优化微波提取甘草黄酮的实验条件 ,继以分光光度法测定提取液中的黄酮含量。结果 :通过实验发现微波辅助提取甘草黄酮的最佳条件为 :固液比 8倍 ,乙醇浓度为38% ,加热功率为 2 88W ,加热时间为 1min时 ,微波辅助提取法 (2 4 .6mg·g- 1 )明显优于水提法 (1 1 .4mg·g- 1 )。结论 :微波辅助提取法提取率高 ,且提取时间大大缩短 ,是一种合适甘草黄酮的提取法。

Objective: To search for the best condition of microwave assisted extraction(MAE) for the flavonoids in Radix glycyrrliza and to compare with traditional boiling water extraction(WE). Methods: MAE and BWE were adopted, and its proper experimental conditions were examined and optimized by means of uniform design. The flavonoids in Radix glucyrrliza were determined by spectrophotometry. Results: Appropriate MAE conditions included extraction time of 1min, ethanol concentration of 38%, liquid/solid ratios of 8∶1(ml/g) and the power of microwave oven of 288W, the recovery of flavonoids from Radix glycyrrliza with MAE(24.6mg/g) was higher than BWE (11.4mg/g). Conclusion: Compared with traditional boiling water extraction(BWE), the experiment results demonstrated higher extracting rate and shorter extracting time. It indicated that MAE was more suitable to extraction of the flavonoids.