超声与矩形脉冲电场协同提取植物多糖及其耦合机理研究

项目名称： 超声与矩形脉冲电场协同提取植物多糖及其耦合机理研究

项目编号： No.11464002

项目类型： 地区科学基金项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 陆海勤

作者单位： 广西大学

项目金额： 52万元

中文摘要： 研制出超声与矩形脉冲电场耦合提取装置；选用药源植物枸杞、茯苓作为研究对象，考察各因素对植物多糖提取率的影响规律，运用响应曲面设计优化，确定最适宜的提取参数；测量电场、超声参数对声空化产额的影响，并对电场影响超声空化物理效应进行详细的计算分析，理论探讨空化泡随电场方向的变形情况、气泡的长短径比与电场强度的关系，通过对空化泡壁运动方程(R-P 方程)的修正，研究电场作用下空气泡随时间的生长情况，结合超声空化阈值、空化泡的自然共振频率的计算，确定超声、电场和流体参数对超声空化效应的影响规律。进一步采用理论和实验对比的方法，建立超声与矩形脉冲电场耦合提取植物多糖动力学模型。 本课题研究为超声与电场耦合技术应用提供理论依据，对电场强化超声提取植物有效成分具有很大的指导作用，对于超声学、声化工理论的发展和完善也具有重要意义。

中文关键词： 超声；矩形脉冲电场；提取；多糖；机理

英文摘要： The extraction apparatus of ultrasound coupling rectangular pulsed electric field will be designed and developed. The investigation is to find out the effects of the parameters on the extraction of polysaccharides from medicinal plants, using Lycium Barbarum L. and Poria Cocos as materials. Response surface methodology (RSM) is employed to optimize the multifactor experiment and determine optimal values of variables for the process. After invesitigating the effects of the parameters of electric field and ultrasonic on cavitation yield, the elaborate calculation and analysis of the effect of the electrostatic field on ultrasonic cavitation is then undertaken, theoretically study about that how the bubbles deformed with the direction of the electric field and the relationship between major to minor axis ratio of cavitational bubbles and electric field intensity are finally carried out. The growth of air bubbles with a function of time can be studied through the modification of the cavitational bubble motion equation(R-P equation),Combination the calculation of cavitation threshold with the natural resonance frequency of the bubbles, the influence rule of ultrasonic, electric field and fluid parameters on ultrasonic cavitation could be concluded. The mathematical model of ultrasound extraction coupling rectangular pulsed electric field will be set up by comparing the experiment with relevant theories. This research provides theoretical basis for the application of ultrasonic coupling electric field and promotes the advancement of electric field assisted ultrasound extraction techniques. Meanwhile, it also exerts crucial impacts on the improvement of ultrasonics and sonochemistry theories.

英文关键词： ultrasound;rectangular pulsed electric field;extraction;polysaccharides;mechanism