大孔树脂对紫甘薯色素的吸附与解吸特性研究

为了选择紫甘薯色素粗提液纯化性能较好的树脂，采用AB-8型、S-8型、NKA-II型和NKA-9型4种大孔树脂对紫甘薯色素进行了吸附与解吸试验，研究了大孔树脂对紫甘薯色素的静态吸附动力学曲线、吸附等温曲线及解吸特性。结果表明：在4种树脂中，AB-8型树脂吸附平衡的速率常数为最大，对紫甘薯色素的吸附量和解吸量分别是S-8、NKA-II及NKA-9的119%，139%，118%和105%，116%，118%，因而AB-8型大孔树脂是用于纯化紫甘薯色素较为合适的吸附剂，解吸时宜选用60%乙醇溶液。

Adsorption and desorption characteristics of macroporous resins to purple sweet potato pigments

The characteristics of static adsorption dynamics, adsorption isotherm and desorption of four kinds of macroporous resins (AB-8, S-8, NKA-II and NKA-9) to purple sweet potato pigments (PSPPs) were investigated. The results indicate that the AB-8 type macroporous resin is the suitable resin for the adsorption of PSPPs with the maximal velocity constant of absorption equilibrium, and its adsorption amount is 1.19, 1.39 and 1.18 times of that of S-8, NKA-II and NKA-9 type macroporous resines respectively. Meantime, its desorption amount is 1.05, 1.16 and 1.18 times of that of S-8, NKA-II and NKA-9 type macroporous resines. The results of desorption trail suggest that 60% ethanol solution is the optimum solution for the desorption of purple sweet potato pigments.