D301树脂对沙苑子酚类物质的吸附动力学研究

本文以D301树脂对沙苑子甲醇粗提物中酚类物质的吸附特性为研究内容,具体分析了D301树脂的静态吸附动力学、吸附等温线、吸附热力学性质和动态吸附参数,并用所优化的条件对沙苑子甲醇粗提物中酚类物质进行了纯化。结果表明,在静态吸附实验条件下,D301树脂对沙苑子酚类物质的吸附是吸热过程,等温线略向上凸起属具有物理吸附特性的优惠吸附类型,吸附参数能用Freundlich方程较好拟合,相关系数均大于0.99;动态吸附研究表明,用70%的乙醇作为洗脱剂即可获得较高的解吸率;提取物上样浓度在13.5 mg/mL、流速为2.0 mL/min时有利于吸附且能使吸附很快达到平衡;经D301树脂吸附纯化处理后,粗提物中总酚含量由10.2%提高到34.3%是原来的近3.4倍。本研究表明,可以用D301树脂对沙苑子酚类物质进行较好的纯化。

Adsorption Properties of D301 Resins on Phenols in Methanol Extracts of Astragalus complanatus R. Br.

This work studied the adsorption properties of D301 resin on the phenols in methanol extracts of Astragalus complanatus R. Br., including static equilibrium adsorption isotherms and thermodynamic adsorptions. The results for static equilibrium adsorption isotherms showed that the adsorption of D301 resin on phenols in methanol extracts was an endothermic process, favorable physical adsorption. The Freundlich adsorption law was applicable to the adsorption of D301 resin on phenols within the conditions studied, since the relative coefficient was above 0.99. The results of dynamic adsorptions showed that 70% ethanol was the most suitable de-adsorption solvent. The adsorption equilibrium can be reached at the sample concentration of 13.5 mg/mL and flow of 2.0 mL/min for methanol extracts. After adsorption purification of D301, the purity of phenols in the methanol extracts was increased by more than three times. The results suggested that D301 resin can be used for purifying the phenols in the methanol extracts of Astragalus complanatus R. Br.