超声循环法提取连钱草总黄酮

目的:在超声条件下寻找提取连钱草总黄酮的优化条件。方法：采用正交设计法,以超声功率、超声时间、提取温度、溶剂体积分数为因素,每个因素3个水平,选择L9(3⁴)正交表,用紫外分光光度法测定总黄酮的含量做为评价指标。结果：最佳提取条件为超声功率800 W,超声时间90(45,45) min, 提取温度40 ℃,溶剂浓度65%。最佳提取条件下总黄酮的质量分数为5.228%。结论：以乙醇为溶剂,采用超声循环提取技术提取连钱草中总黄酮,提取温度低,时间短,提取效率高,具有广阔前景。

Circulated extraction of flavonoids from Glechoma longituba by ultrasonic wave

OBJECTIVE: To investigate the optimum condition of extraction for the flavonoids in Glechoma longituba by ultrasonic wave. METHOD: Using orthogonal test, the effects of ultrasonic power, ultrasonic time, extraction temperature and solvent concentration were considered, the comprehensive evaluation was guided by the content of the flavonoids determined by ultraviolet spectrophotometer. RESULT: The optimum condition was as follow: ultrasonic power; 800 W, ultrasonic time 90 min, extraction temperature 40 degrees C, solvent concentration 65%. The flavonoids concent is 5.228%. CONCLUSION: Using ethanol as solvent, circulated extraction of the flavonoids from G. longituba with ultrasonic wave is feasible with the optimum conditions in low temperature, short time and high production yield.