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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Optimization on preparation conditions of calcium-crosslinked modified chitosan as potential matrix material for theophylline sustained-release beads and its evaluation of release kinetics
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Optimization on preparation conditions of calcium-crosslinked modified chitosan as potential matrix material for theophylline sustained-release beads and its evaluation of release kinetics

机译:钙交联改性壳聚糖作为茶碱缓释微丸潜在基质材料的制备条件优化及释放动力学评价

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摘要

This study aimed to prepare theophylline loaded hydroxamated chitosan alpha-ketoglutaric acid (HKCTS) microspheres by ion crosslinking method, and optimize the process and formulation variables using response surface methodology. The independent variables studied were pH value, concentrations of Ca(II) ion and HKCTS/theophylline ratio. The dependent variables (responses) were drug loading content and encapsulation efficiency. Mathematical equations and response surface plots were used to relate the independent and dependent variables. The release kinetics was evaluated by fitting the experimental data to standard release equations (zero-, first- and Higuchi equation). Results showed that the optimal conditions for microsphere formulation were 9.6 mg/mL Ca(II) ion, 1: 1 (g/g) HKCTS/theophylline ratio and pH 9.1, the drug loading content and encapsulation efficiency were 53.40% and 69.61%, respectively. The best fit was found with Higuchi model for the microspheres. The response surface methodology could provide a promising application for calcium cross-linked modified chitosan beads as a new matrix for controlled release of theophylline. (C) 2015 Elsevier B.V. All rights reserved.
机译:本研究旨在通过离子交联法制备负载茶碱的异羟肟酸壳聚糖α-酮戊二酸(HKCTS)微球,并采用响应面法优化工艺和配方变量。研究的独立变量是pH值,Ca(II)离子浓度和HKCTS /茶碱比。因变量(响应)是载药量和封装效率。数学方程和响应面图用于关联自变量和因变量。通过将实验数据与标准释放方程式(零,第一和Higuchi方程式)拟合来评估释放动力学。结果表明,微球制剂的最佳条件为9.6 mg / mL Ca(II)离子,1:1(g / g)HKCTS /茶碱比例和pH 9.1,载药量和包封效率分别为53.40%和69.61%,分别。用Higuchi模型找到了最合适的微球。响应表面方法可以为钙交联的改性壳聚糖珠子作为控制茶碱释放的新基质提供有希望的应用。 (C)2015 Elsevier B.V.保留所有权利。

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