School of Pharmacy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China.
J Mater Sci Mater Med. 2011 Feb;22(2):327-37. doi: 10.1007/s10856-010-4213-3. Epub 2011 Jan 8.
The ethylene vinyl acetate copolymer (EVA)/Poly (lactic acid) (PLA) blend and EVA/Poly (ethylene glycol) (PEG) blend were applied as the drug carrier materials for a bi-layer drug-loaded stent coating film, which consisted of a paclitaxel (PTX)-loaded layer and a drug-free EVA layer. The changes of weight and appearance of the drug-free polymeric blend films with increasing time were examined by X-ray diffraction analysis (XRD), gel permeation chromatography (GPC) tests and scanning electronic microscopy (SEM), and the results showed the degradation of PLA and the leaching of PEG from the films. The effects of PLA, PEG and drug contents on in vitro drug release were investigated, and the results demonstrated that the addition of PLA promoted the drug release while the addition of PEG almost did not. Franz cells diffusion test results indicated that the bi-layer structure successfully endowed the stent coating with the release of drug in a unidirectional fashion. The release profiles of films incorporated PTX and the mechanical performance of the film could be customized by readily adjusting the contents of the blend components. Therefore, the polymeric blends could be useful drug carrier materials for drug-loaded stent coating capable of releasing drug in a highly tunable manner.
乙烯-醋酸乙烯酯共聚物(EVA)/聚乳酸(PLA)共混物和 EVA/聚乙二醇(PEG)共混物被应用于双层载药支架涂层膜的药物载体材料,该涂层膜由载紫杉醇(PTX)层和无药 EVA 层组成。通过 X 射线衍射分析(XRD)、凝胶渗透色谱(GPC)测试和扫描电子显微镜(SEM)检查了无药聚合物共混膜随时间增加时重量和外观的变化,结果表明 PLA 降解和 PEG 从膜中浸出。考察了 PLA、PEG 和药物含量对体外药物释放的影响,结果表明 PLA 的加入促进了药物释放,而 PEG 的加入几乎没有影响。Franz 细胞扩散试验结果表明,双层结构成功地使支架涂层具有单向释放药物的能力。通过调整共混物成分的含量,可以定制载药膜的药物释放曲线和力学性能。因此,聚合物共混物可用作载药支架涂层的药物载体材料,能够以高度可调的方式释放药物。