聚乙二醇修饰的共聚物纳米粒研究进展

可生物降解的聚合物纳米粒作为药物输送载体有很多优势，如可控释，靶向等。但是，由于聚合物纳米粒经静脉经给药后，数秒或数分钟内会被皮网状系统清除而无法普遍应用，为了克服这一缺点，越来越多的研究者引入亲水性组分聚乙二醇（PEG）对聚合物进行修饰，以避免其被内皮肉状系统摄取。聚乙二醇的引入不仅会影响聚合物纳米粒的生物降解行为，而且会影响药物的释放，体内分布等行为，本文综述了聚乙二醇修饰的共聚物纳米粒的制备，稳定性，载体，体外释药，体内分布，毒性等方面的研究进展，并对其前景进行预测。

Researches on PEG-modified Copolymer Nanoparticle

Biodegradable polymeric nanoparticles acting as drug carrier have important potential applications such as site-specific drug delivery and controllable drug delivery. However, these carriers cannot generally be used because they are eliminated by the reticulo-endothelial system within seconds or minutes after intravenous injection. To overcome this limitation, more and more researchers introduce hydrophilic polyethylene glyeol(PEG) to modify polymeric nanoparticles for avoiding their uptake by reticulo-endothelial system. Introducing PEG not only changes polymer nanoparticles' biodegradation in vivo, but also influences drug's properties such as drug release, in vivo biodistribution, et al. In this paper are reviewed the researches of PEG-modified copolymer nanoparticles, including their preparation and size distribution, stability, drug incorporation, drug release, in vivo biodistribution, in vitro cytotoxicty. A prospect for the researches and developments of the PEG-modified copolymer nanoparticles was also made.