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A pH-sensitive water-soluble N-carboxyethyl chitosan/poly(hydroxyethyl methacrylate) hydrogel as a potential drug sustained release matrix prepared by photopolymerization technique

机译:pH敏感的水溶性N-羧乙基壳聚糖/聚(甲基丙烯酸羟乙酯)水凝胶作为潜在的药物缓释基质,采用光聚合技术制备

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摘要

Biocompatible pH-sensitive semi-interpenetration polymeric network hydrogels (semi-IPN) based on water-soluble N-carboxyethyl chitosan (CECS) and 2-hydroxyethyl methacrylate (HEMA) were synthesized by the photopolymerization technique. pH-sensitivity, cytotoxicity, morphology, mechanical property, and water state of hydrogel were investigated by a swelling test, methylthiazolydiphenyl-tetrazolium bromide (MTT) assay, scanning electron microscopy (SEM), universal testing machine, and differential scanning calorimetry (DSC), respectively. The drug release studies were carried out using 5-Flurouracil as the model drug. The results indicated that the hydrogels were sensitive to pH of the medium and its wet state had good mechanical properties. The results of cytotoxicity and prolonged drug release characteristics revealed the suitability of the hydrogels as drug delivery matrices. The release kinetics was evaluated by fitting the experimental data to standard release equations, and the best fit was obtained with the Higuchi model of the hydrogel.
机译:通过光聚合技术合成了基于水溶性N-羧乙基壳聚糖(CECS)和甲基丙烯酸2-羟乙酯(HEMA)的生物相容性pH敏感型半互穿聚合物网络水凝胶(semi-IPN)。通过溶胀试验,甲基噻唑基二苯基溴化四氮唑(MTT)测定,扫描电子显微镜(SEM),通用测试仪和差示扫描量热法(DSC)研究了水凝胶的pH敏感性,细胞毒性,形态,机械性能和水状态, 分别。使用5-氟尿嘧啶作为模型药物进行了药物释放研究。结果表明,水凝胶对介质的pH敏感,其湿态具有良好的力学性能。细胞毒性和延长的药物释放特性的结果表明,水凝胶适合作为药物传递基质。通过将实验数据与标准释放方程式拟合来评估释放动力学,并使用水凝胶的Higuchi模型获得最佳拟合。

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