The Optimization and Comparison of Three Extraction Technologies of Flavonoids from Pueraria Lobata

This paper optimized three kinds of extraction technologies of flavonoids from Pueraria Lobata and compared them with each other.The results showed that the optimized conditions of ethanol-extracting were as follows: 70% ethanol extracting at 80℃ for 1 h,and the ratio of material to solvent is 1:10,under which the extraction rate was 62.8%.However,85.7% extraction rate could be obtained by means of ethanol-extracting with microwave processing under mid-strong microwave power for 40s,extracted three times in 60% athanol,with the ratio of material to solvent 1:20.Meanwhile,the optimized conditions of ethanol-extracting with ultrasonic treatment were as follows: 70% ethanol extracting at 60℃ for 20 min,and the ratio of material to solvent is 1:15,under which the extraction rate was 56.1%.In conclusion,microwave processing had the best effect,and it also had such advantages as fast,power saving and high extraction rate.