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Effects of Drug and Polymer Molecular Weight on Drug Release from PLGA-mPEG Microspheres

机译:药物和聚合物分子量对PLGA-mPEG微球药物释放的影响

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This study investigated the effects of drug and polymer molecular weight on release kinetics from poly (G-co-glycolic acid)-methoxypoly(ethyleneglycol) (PLGA-mPEG) microspheres. Bovine serum albumin (BSA, 66 kDa), lysozyme (LZ, 13.4 kDa), and vancomycin (VM, 1.45 kDa) were employed as the model drugs, and encapsulated in PLGA-mPEG microspheres of different molecular weight. Release of macromolecular BSA was mainly dependent on diffusion of drug atear the surface of the matrix initially and dependent on degradation of matrix at later stages, while, the small drug of vancomycin seemed to depend totally on diffusion for the duration of the release study. The release behavior of lysozyme was similar to bovine serum albumin, except a shorter lag period. PLGA-mPEG molecular weight also affected the release behavior of bovine serum albumin and lysozyme, but not obviously. PLGA-mPEG microspheres in smaller molecular weight seemed to degrade more quickly to obtain a mass lose and matrix erosion, and thus, an accelerated release rate of bovine serum albumin and lysozyme. Vancomycin released much faster than bovine serum albumin and lysozyme, and exhibited no lag period, as it is thought to be diffusion-controlled. Besides, vancomycin showed no difference in release behavior as PLGA-mPEG molecular weight change. (C) 2014 Wiley Periodicals, Inc.
机译:这项研究调查了药物和聚合物分子量对聚(G-co-乙醇酸)-甲氧基聚(乙二醇)(PLGA-mPEG)微球释放动力学的影响。牛血清白蛋白(BSA,66 kDa),溶菌酶(LZ,13.4 kDa)和万古霉素(VM,1.45 kDa)用作模型药物,并封装在不同分子量的PLGA-mPEG微球中。最初,大分子牛血清白蛋白的释放主要取决于药物在基质表面/附近的扩散,而在后期则取决于基质的降解,而万古霉素的小剂量药物在释放研究期间似乎完全取决于扩散。 。溶菌酶的释放行为与牛血清白蛋白类似,只是延迟时间较短。 PLGA-mPEG分子量也影响牛血清白蛋白和溶菌酶的释放行为,但影响不明显。分子量较小的PLGA-mPEG微球似乎降解得更快,从而导致质量损失和基质侵蚀,从而加速了牛血清白蛋白和溶菌酶的释放速率。万古霉素的释放比牛血清白蛋白和溶菌酶快得多,并且没有滞后期,因为它被认为是受扩散控制的。此外,万古霉素的释放行为没有随PLGA-mPEG分子量的变化而变化。 (C)2014威利期刊公司

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