首页> 外文期刊>Journal of Applied Polymer Science >Gastro-Resistant Controlled Release of OTC Encapsulated in Alginate/Chitosan Matrix Coated with Acryl-EZEV_? MP in Fluidized Bed
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Gastro-Resistant Controlled Release of OTC Encapsulated in Alginate/Chitosan Matrix Coated with Acryl-EZEV_? MP in Fluidized Bed

机译:包衣有Acryl-EZEV_?的藻酸盐/壳聚糖基质中的OTC的抗胃泌素控制释放。流化床中的MP

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摘要

A gastro-resistant system of acryl-EZEVR MP coated alginate/chitosan microparticles was developed to improve the controlled release of oxytetracycline (OTC). Microparticles were obtained by complex coacervation and, thereafter, were coated using fluidized polymer dispersion with acryl-EZEVR MP solution. OTC distribution inside the microparticles was determined by multiphoton confocal microscopy, demonstrating the efficiency of encapsulation process. In vitro OTC release kinetic was performed in order to obtain the release profile in gastric and intestinal simulated fluids. A fast initial release, or burst effect, was observed with uncoated microparticles loaded with OTC in gastric conditions. When a 50% mass increase in acryl-EZEVR MP coating was achieved, OTC release in acidic medium was greatly reduced, resulting in the expected gastro-resistant effect. Different mathematical models were applied to describe the drug diffusion across the polymer matrix. The Logistic model was the best tool to interpret the experimental data in most of the systems studied.
机译:开发了丙烯酸-EZEVR MP包衣的藻酸盐/壳聚糖微粒的耐胃液系统,以改善土霉素的控制释放。通过复合凝聚获得微粒,然后,使用流化聚合物分散体用丙烯酸-EZEVR MP溶液涂覆微粒。通过多光子共聚焦显微镜确定了微粒内部的OTC分布,证明了包封过程的效率。为了获得在胃和肠模拟液中的释放曲线,进行了体外OTC释放动力学。在胃部条件下,未包被OTC的微粒可以观察到快速的初始释放或爆发效应。当丙烯酸-EZEVR MP涂料的质量增加50%时,在酸性介质中的OTC释放量大大减少,从而达到了预期的耐胃毒作用。应用了不同的数学模型来描述药物在聚合物基质中的扩散。 Logistic模型是解释大多数研究系统中的实验数据的最佳工具。

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