首页> 外文期刊>Journal of Applied Polymer Science >The polymer free volume as a controlling factor for drug release from poly(lactide-co-glycolide) microspheres
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The polymer free volume as a controlling factor for drug release from poly(lactide-co-glycolide) microspheres

机译:聚合物自由体积是控制药物从聚丙交酯-乙交酯共聚物微球中释放的控制因素

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Drug release from poly(lactide-co-glycolide) (PLGA) microspheres is strongly determined by the pore structure of the particles. This study examines how swelling-induced pore constriction delays the drug release and by which factors this process is controlled. Combination of different porosimetric and pycnometric methods enabled insight into the submicroscopic range of the pore structure and revealed that remarkably the polymer free volume plays a crucial role in drug release from PLGA microspheres. Surprisingly, the latter was shown to be inversely correlated to the degree of diffusional drug release. This can be explained by a swelling-induced constriction of the macroporous channel system in the microspheres which is related to the availability of free volume. The hole free volume was shown to be well controllable by the manufacturing conditions. Thus, the study deepens comprehension of the mechanism of drug release from biodegradable microparticles and offers an effective approach for controlling the release behavior.
机译:从聚丙交酯-乙交酯共聚物(PLGA)微球中释放的药物在很大程度上取决于颗粒的孔结构。这项研究探讨了溶胀诱导的毛孔收缩如何延迟药物释放以及通过哪些因素控制该过程。不同的孔隙率和比重法的组合可以洞察孔结构的亚微观范围,并揭示出无聚合物的体积在PLGA微球药物释放中起着至关重要的作用。令人惊讶的是,后者被证明与药物扩散程度成反比。这可以通过微球中大孔通道系统的膨胀诱导收缩来解释,这与自由体积的可用性有关。已证明,无孔体积可由制造条件很好地控制。因此,该研究加深了对可生物降解微粒药物释放机理的理解,为控制药物释放行为提供了有效途径。

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