荷叶中荷叶碱的浸提动力学模型研究

目的]考察温度、溶剂量、溶剂种类对荷叶碱浸提动力学过程。方法]基于Fick第一定律建立浸提动力学模型将不同提取条件对荷叶碱浸提动力学的影响进行拟合与预测。结果]温度升高,浸提速率及浸提量增大,且随温度升高,其对浸提量影响减小。提取体积增大,荷叶碱平衡提取量增大,但浸提达到平衡的时间延长。不同溶剂提取过程中,存在浓度交叉,试验范围内以70%乙醇提取率最高。不同溶剂下荷叶中荷叶碱浸提动力学符合一级一项浸提动力学模型。结论]采用数字模型定量描述浸提过程功能成分质量浓度随时间变化的规律,其对于揭示不同因素对浸提动力学效果的影响及优化浸提工艺等具有重要指导意义。

Study on extraction kinetics model of lotus leaf alkali from lotus leaf

Objective] To investigate the kinetics of lotus leaf alkali extraction by temperature, solvent amount and solvent type.Methods] Based on Fick''s first law, a kinetic model of extraction was established to fit and predict the effects of different extraction conditions on the kinetics of lotus leaf extraction.Results] The temperature increased, the leaching rate and the amount of leaching increased, and the effect on the leaching amount decreased with the increase of temperature. When the extraction volume is increased, the equilibrium extraction amount of the lotus leaf base is increased, but the time for the leaching to reach equilibrium is prolonged. During the different solvent extraction processes, there was a concentration crossover, and the 70% ethanol extraction rate was the highest in the test range. The leaching kinetics of lotus leaf in lotus leaves under different solvents accorded with the first leaching kinetics model.Conclusion] The numerical model was used to quantitatively describe the variation of the concentration of functional components in the extraction process with time. It has important guiding significance for revealing the influence of different factors on the extraction kinetics and optimizing the extraction process.