Ultrasonic Extraction of Flavonoids from Persimmon Leaves Technology Research

[Objective] To study the technique and parameters for ultrasonic extraction of flavonoids from persimmon leaves.[Method] Using ultrasonic assisted method,with alkali and ethanol as solvents,ultrasonic water extraction,ultrasonic ethanol extraction technological condition was optimized.[Results] The optimum technique conditions by ultrasonic alkali water extraction method were: time 40 min,temperature 40 ℃,solid-liquid ratio 1∶30 g/ml,soaking time 6 h,the content of flavones was 5.28%;optimum conditions by ultrasonic ethanol extraction were: solid-liquid ratio 1∶10 g/ml,ultrasonic power 200 W,extraction time 30 min.The obtained total flavone content was 6.19%.[Conclusion] Ultrasonic water extraction method is economical and practical,which is suitable for production;ultrasonic solvent extraction method could obtain high content of flavonoids,more than 0.8% than ultrasonic water extraction method.