双频超声强化提取的机理

Mechanism of Extraction Enhanced by Dual-Frequency Ultrasonic

采用由40 kHz槽式超声与25 kHz探头式超声组成的双频超声装置进行实验.提出了双频超声的物理模型方程,利用碘量法研究了不同频率下超声的空化效应,并将双频超声应用于黄柏中小檗碱的提取过程.通过对物理模型的模拟计算得出:双频超声(25 kHz+40 kHz)的空化概率高于单频超声;双频超声辐照碘化钾溶液,碘的释放量高于单频超声时的释放量;双频超声提取黄柏中的小檗碱,提取率为64.1%,高于单频超声的提取率.

A dual-frequency ultrasonic device combining both a 40kHz ultrasonic in bath and a 25kHz ultrasonic in horn was used to extract berberine from phellodendron. The physical model and the corresponding equations of the dual-frequency device were also proposed. The cavitation caused by the ultrasonic with different frequencies was then investigated by means of the iodine method. Results of the simulation with the proposed physical model reveal that （ 1 ） the cavitational behaviour caused by （25 ＋ 40） kHz dual-frequency ultrasonic is more obvious than that caused by single-frequency ultrasonic ; （2） the amount of iodine released from kalium iodid in the radiation of dualfrequency ultrasonic exceeds that in the radiation of single-frequency ultrasonic ; and （3） more berberine can be extracted from phellodendron in the radiation of dual-frequency ultrasonic, the yield of which being 64.1%.