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目的:研究乌蕨总黄酮在大孔树脂上的吸附特性及热力学性质。方法:采用静态法,考察HPD系列和XAD系列共12种大孔吸附树脂对乌蕨总黄酮的吸附及解析特性,确定最佳吸附树脂。根据不同等温吸附模型Langmuir及Freundlich方程分别对实验数据进行线性回归,通过相关系数的分析评价模型的适用性,并计算吸附过程热力学参数。结果:HPD300的吸附效果最好。其吸附焓变ΔH>0,吸附熵变ΔS和吸附自由能ΔG均小于零。结论:HPD300吸附乌蕨总黄酮的过程为放热过程,低温有利于吸附;同时,吸附过程为非自发过程,范德华力克服放热过程吸附主动进行。
Objective: To study the adsorption characteristics and thermodynamic properties of total flavonoids of U. crassifolia on macroporous resin. Methods: Static method was used to investigate the adsorption and analytical properties of total flavonoids from 12 macroporous resins HPD series and XAD series to determine the optimum adsorption resin. According to different isothermal adsorption model Langmuir and Freundlich equation, the experimental data were linear regression, the applicability of the model was evaluated by the correlation coefficient, and the thermodynamic parameters of the adsorption process were calculated. Results: HPD300 has the best adsorption. The adsorption enthalpy change ΔH> 0, adsorption entropy change ΔS and adsorption free energy ΔG are less than zero. CONCLUSION: HPD300 can adsorb the total flavonoids from the fern. The low temperature is favorable for the adsorption. At the same time, the adsorption process is non-spontaneous and van der Waals forces overcome the exothermic process.