Study on the Ultrasonic Extraction Process of Flavonoids from Litchi Pericarp

[Objective] To optimize the ultrasonic extraction process of the flavonoids from litchi pericarp.[Method] The total flavnoids was extracted by ultrasonic method,and the optimum extraction process was optimized with orthogonal design on the basis of single factor test.[Result]The optimum extraction conditions of flavonoids from litchi pericarp were as follows:alcohol concentration of 60%,solid-liquid ratio of 1∶50 extracting duaration of 30 min,extraction for twice.Under these conditions,the extraction rate of flavonoids reached as high as 28.18 mg/g.[Conclusion] Ultrasonic extraction technology is convenient and effective for the extraction of total flavonoids from litchi pericarp,which lays foundation for its further development.