Release model of alginate microcapsules containing volatile tea-tree oil

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Title:	Release model of alginate microcapsules containing volatile tea-tree oil
Authors:	Yeh, KW (Yeh, Kuan-Wen) Chang, CP (Chang, Chih Pong) Yamamoto, T (Yamamoto, Takao) Dobashi, T (Dobashi, Toshiaki)
Contributors:	Dept Text Engn
Keywords:	Microcapsule Constant release Tea tree oil ANTIFUNGAL ACTIVITY
Date:	2011-05-05
Issue Date:	2013-01-18 11:16:22 (UTC+8)
Abstract:	We have prepared alginate calcium microcapsules containing tea tree oil and measured the release behavior. The release rate observed at different temperatures was almost constant with time. The data were analyzed by a theory for a model system consisting of encapsulated coexisting liquid and vapor phases. The theory predicts a polynomial-type release which is much more uniform than the exponential-type release appearing in conventional microcapsule systems and regarded as roughly constant release. The observed release curves were expressed well by the theoretical equation for the release, which supports the validity of the theory. From the fitting of the data to the theory, the time constant for vaporization in the core and that for permeation through the microcapsule membrane were determined. The activation energy for permeation through the membrane determined from the fitting parameters is much larger than that for vaporization. (C) 2011 Elsevier B.V. All rights reserved.
Relation:	COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS Volume: 380 Issue: 1-3 Pages: 152-155
Appears in Collections:	[Department of Textile Engineering ] journal articles

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