载基因壳聚糖纳米粒的制备及其相关性质的研究

目的：制备壳聚糖载基因纳米粒，并对其体外相关性质进行初步研究。方法：采用复凝聚法制备载基因纳米粒；用纳米粒度仪测量粒度分布，分散性和Zeta电位；用透射电镜观察粒子的形态；用紫外分光光度法和比色法测定包封率和载药量，并对主要影响因素进行考察。用凝胶阻滞分析和电性结合分析对载药方式进行初步推测。结果：所制备的载基因纳米粒形态规则，大多呈球形，纳米粒平均粒径为263．2nm，粒径分布较窄，多分散度为0．213，Zeta电位为19．8mV；包封率大于90％，载药量约30％；凝胶阻滞和电性结合分析结果表明，非甲基化胞嘧啶鸟嘌呤的寡核苷酸链（CPG-ODN）与壳聚糖分子间可通过电性结合作用而完全结合。结论：采用复凝聚法可制备粒度分布均匀，形态规则，具有较高包封率和载药量的载基因壳聚糖纳米粒；电性结合作用是载基因壳聚糖纳米粒载药的主要方式。

Preparation and Characteristics of Chitosan Nanoparticles Carrying Gene

Objective:To prepare chitosan nanoparticles(CS-NP) carrying gene and study its characteristics in vitro.Method: The chitosan nanoparticles carrying gene were prepared by complex coacervation.Its size distribution,polydispersity and Zeta potential were determined by nanoparticle size analyzer;The morphology was observed by transmission electronic micrograph.The encapsulating rate and loading efficiency were determined by ultraviolet spectrophotometry and colorimetry.The manner of drug loading was specula- te...