首页> 外文期刊>Journal of Applied Polymer Science >Biodegradable Membranes for the Controlled Release of Progesterone. 1.Characterization of Membrane Morphologies Coagulated from PLGA/Progesterone/DMF Solutions
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Biodegradable Membranes for the Controlled Release of Progesterone. 1.Characterization of Membrane Morphologies Coagulated from PLGA/Progesterone/DMF Solutions

机译:孕酮控释的生物可降解膜。 1,从PLGA /孕酮/ DMF解决方案凝集的膜形态特征

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Biodegradable membranes containing progesterone as a drug were prepared from ternary, poly(d,l-lactide-co-glycolide)/progesterone/dimethylformamide, solutions. The homogeneous solutions, after cast on glass plates, were solidified to result in a solid membrane structure by three different solvent-removal processes: solvent evaporation under vacuum, solvent extraction via immersion into the nonsolvent bath, or vapor exposure at high humidity condition. Impregnation characteristics of progesterone in the prepared membranes varied significantly, depending on the removal processes used. When a cast solution was solidified by exposure at the environment of 70% relative humidity, progesterone eas separated from a membrane structure with the morphology of flake-like shapes, and thermal analysis of the prepared membrane showed the clear, endothermic peak of the drug. Vitrification of a cast solution by solvent evaporation under vacuum induces both the uniform drug dispersion in the polymer matrix, with the drug forming spherical structures, and the strong interaction between the drug and the matrix, as identified by a broadened melting endotherm of the drug. When coagulated at thermodynamic nonequilibrium conditions through rapid exchange between dimethyformamide and water, the cast solution film results in a membrane structure consisting of the drug distributed nonuniformly in the polymer matrix.
机译:从三元聚(d,l-丙交酯-共-乙交酯)/黄体酮/二甲基甲酰胺溶液制备含有黄体酮作为药物的可生物降解膜。将均质溶液浇铸在玻璃板上后,通过三种不同的去除溶剂工艺固化成固体膜结构:真空蒸发溶剂,通过浸入非溶剂浴中提取溶剂或在高湿度条件下暴露于蒸汽。孕酮在制备的膜中的浸渍特性差异很大,这取决于所用的去除方法。当铸型溶液在相对湿度为70%的环境下暴露而固化时,黄体酮从具有片状形态的膜结构中分离出来,并且对所制备的膜进行热分析表明该药物具有清晰的吸热峰。通过在真空下溶剂蒸发对浇铸溶液进行玻璃化,既可以使药物在聚合物基质中均匀分散,使药物形成球形结构,又可以引起药物与基质之间的强相互作用,这由药物的熔融吸热变大所证实。当在热力学非平衡条件下通过二甲基甲酰胺和水之间的快速交换而凝结时,流延溶液膜形成由药物组成不均匀地分布在聚合物基质中的膜结构。

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