PREPARATION AND RELEASE BEHAVIOR OF ETHYLCELLULOSE MICROCAPSULES CONTAINING THEOPHYLLINE DISPERSED IN CELLULOSE TRIACETATE MATRICES

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Title:	PREPARATION AND RELEASE BEHAVIOR OF ETHYLCELLULOSE MICROCAPSULES CONTAINING THEOPHYLLINE DISPERSED IN CELLULOSE TRIACETATE MATRICES
Authors:	WU,JC;JEAN,WJ;CHEN,H
Contributors:	化學工程與材料工程學系
Keywords:	WALLED MICROCAPSULES;INVITRO DISSOLUTION;SOLUBLE DRUGS;SODIUM;PHENOBARBITONE;KINETICS
Date:	1993
Issue Date:	2010-06-29 17:34:57 (UTC+8)
Publisher:	中央大學
Abstract:	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.
Relation:	JOURNAL OF THE CHINESE CHEMICAL SOCIETY
Appears in Collections:	[National Central University Department of Chemical & Materials Engineering] journal & Dissertation

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