The effect of ethylcellulose molecular weight on the properties of theophylline microspheres

被引：11

作者：

Dashevsky, A ^{[1
]}

Zessin, G ^{[1
]}

机构：

[1] UNIV HALLE WITTENBERG,INST PHARMAZEUT TECHNOL & BIOPHARM,D-06020 HALLE,GERMANY

来源：

JOURNAL OF MICROENCAPSULATION | 1997年 / 14卷 / 03期

关键词：

microencapsulation; microspheres; theophylline; ethylcellulose; sustained release; solvent evaporation technique;

D O I：

10.3109/02652049709051132

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Microspheres of theophylline, with both ethylcellulose of high and low molecular weight and also their mixtures as a coating material, were prepared using the solvent evaporation technique. No permeability through intact isolated polymer films was found. Therefore, this study investigated the drug release dependence of structure and mechanical properties of the polymer matrix. In vitro dissolution studies exhibited the square-root of time (Higuchi model) release characteristics. The size distribution of microspheres was dependent on the ratio of ethylcellulose mixtures with high and low molecular weights.

引用

页码：273 / 280

页数：8

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