- 作者: 吳貞欽 ; 簡文俊 ; 陳暉
- 作者服務機構: 中央大學化學工程系
- 中文摘要:
Using ethylcellulose and cellulose triacetate as co- wall materials, sustained release microcapsules of theophylline were prepared. The solid drug dispersed in the cellulose triacetate matrices was first prepared by solvent evaporation; then the matrices were microencapsulated by means of coacervation-phase separation of ethylcellulose from toluene solution on addition of petroleum ether.
The shapes and surface characteristics of theophylline, matrices and microcapsules were examined with a scanning-electron microscope. The release of theophylline from various particles into distilled water was studied. The microcapsules had good characteristics of sustained release. The period for theophylline to dissolve from ethylcellulose microcapsules containing cellulose triacetate matrices was larger than those from only ethylcellulose microcapsules with a similar ratio of core to wall. The half-time increased with increasing content of cellulose triacetate. The release pattern which was analogous to that from only ethylcellulose microcapsules obeyed a first-order equation. - 英文摘要: --
- 中文關鍵字: Sustained Release Preparation; Microencapsulation; Theophylline; Cellulose Triacetate Matrix; Ethylcellulose
- 英文關鍵字: 長效製劑;微膠囊製法;茶鹼;三醋酸酯纖維基質;乙基纖維素