Optimum extraction technology of flavonoids in sesame leaves

The content of total flavonoids in sesame leaves and its extraction technology were studied in this paper. By means of the methods of ethanol-extracting and ethanol-extracting with microwave processing, the optimum extraction conditions of flavonoids in sesame leaves were determined. The results showed that the content of total flavonoids in sesame leaves was 0.98%, the optimum conditions of ethanol-extracting were obtained as follows: 80% ethanol as extraction solvent at 80℃ for 2.5 h, and the ratio of material to solvent was 1∶25. Using the technological parameters above mentioned, the average extraction rate of total flavonoids in sesame leaves was 95.6%. Meanwhile, the optimum conditions of ethanol-extracting with microwave processing were as follows: 200 W of microwave power for 70 s, 80% ethanol extracting at 80℃ for 30 min, and the ratio of material to solvent was 1∶25. Using this technology, the extraction rate of total flavonoids in sesame leaves was 95.8%.