摘要
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、多分散性和Zeta电位 ;用透射电镜观察粒子的形态 ;用荧光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 ,平均粒径约 15 0nm ,PDI<0 .2 ,Zeta电位约 2 0mV ;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 ,pDNA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。
OBJECTIVE To prepare chitosan nanoparticles(CS-NP) carrying gene and study its characteristics in vitro. METHODS 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 fluorospectrophotometry and colorimetry .The manner of drug loading was speculated by Gel retardation assay and electronic-combination analysis. RESULTS The morphology of CS-NP was mostly spherical and well-distributed. The mean diameter was about 150 nm with polydispersity less than 0.2 and its Zeta potential was about 20 mV.The encapsulating rate was more than 90% and the loading efficiency was approximately 30%. The results of gel retardation and electronic-combination analysis showed chitosan could completely combine the pDNA by electronic combination.CONCLUSION The CS-NP with well-distributed spherical morphology,high encapsulating rate and loading efficiency can be prepared by complex coacervation. Electronic-combination is the main manner for CS-NP to carry gene.
出处
《华西药学杂志》
CAS
CSCD
2004年第6期409-411,共3页
West China Journal of Pharmaceutical Sciences
基金
国家 8 63计划资助项目 (2 0 0 3AA2 1T0 10 )
