生物可降解分子印迹聚合物的制备及评价

摘要

BACKGROUND:The cross-linking reagent is the main unit to support the skeleton of molecularly imprinted polymers, which is closely related to the bio-friendly adaption of polymers. The biocompatible and biodegradable capacities of common crosslinking agents are unclear. OBJECTIVE:To prepare a novel biodegradable molecularly imprinted polymer and to evaluate the adsorption and biodegradability properties of the polymer. METHODS:The biodegradable molecularly imprinted polymer was synthesized with the acrylated polyε-caprolactone as the cross-linking reagent under the UV polymerization. The adsorption of the polymer was evaluated by adsorption isotherm, Scatchard analysis and kinetic curves. The biodegradation of the polymer was observed in the simulated physiological environment system in vitro. RESULTS AND CONCLUSION:Both the molecularly imprinted polymer and non-molecularly imprinted polymer showed an adsorption effect on theophyl ine, the template. But the adsorption amount of the molecularly imprinted polymer was significantly more than that of the non-molecularly imprinted polymer. The drug loading and encapsulation efficiency of the molecularly imprinted polymer were 1.54%and 12.48%, respectively. The degradation rates of molecularly imprinted polymer and poly(ε-caprolactone) diol were 6.60%and 1.33%, respectively, within the observation time in vitro. The obtained molecularly imprinted polymer not only exhibited specific adsorption to certain molecules but also showed good biodegradable properties in the simulated physiological environment system, which is necessary to be a potent drug carrier.%背景：交联剂是支撑分子印迹聚合物骨架的主要单元，分子印迹聚合物是否生物友好与交联剂的性能密不可分，但目前常用交联剂的生物相容性和生物降解性还不明确。　　目的：制备新型生物可降解分子印迹聚合物，分析其吸附性能和可降解性能。　　方法：以丙烯酰化的聚ε-己内酯为交联剂，以丙烯酸为功能单体，采用紫外光引发聚合法制备茶碱分子印迹聚合物，通过等温吸附、Scatchard分析和动力学曲线研究其吸附能力，在模拟人体生理环境体系中进行体外降解实验。　　结果与结论：等温吸附曲线表明茶碱分子印迹聚合物和非分子印迹聚合物对模板分子茶碱均有吸附能力，但茶碱分子印迹聚合物的吸附量显著高于非分子印迹聚合物。茶碱分子印迹聚合物对茶碱的载药量为1.54%，包封率为12.48%，茶碱分子印迹聚合物和聚ε-己内酯二醇在观察时间内的体外降解率分别为6.60%和1.33%。制备的分子印迹聚合物不仅对目标分子有特异的吸附性能，而且具有良好的生物降解性能，可在模拟人体环境中进行降解。