Study on Microwave Extraction of Total Flavonoids from Famous Tea of Southern Shaanxi

The flavonoids in tea have high medicinal value.The effects of ethanol concentration,ratio of material to liquid,extraction temperature,power of microwave and extraction time on the yield of flavonoids from tea by microwave were studied by single factor design.The extraction process of flavonoids in tea by microwave was optimized by the orthogonal experiment.The results showed that the best extraction conditions were as follows: ethanol concentration was 65%,the ratio of matetial to liquid was 1∶ 70,the microwave power was 600 W,the extraction temperature was 30 ℃,and the extraction time is 7 minutes.