Mechanistic evaluation of the effect of thermal-treating on Eudragit RS matrics

Azarmi, Shirzad and Ghaffari, Fatemeh and Lobenberg, R. and Nokhodchi, Ali (2005) Mechanistic evaluation of the effect of thermal-treating on Eudragit RS matrics. IL Farmaco, 60 . pp. 925-930. ISSN 0014-827X. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Thermal treatment of acrylic matrices was recently introduced as a tool for prolonging the release of drug. Thermal treatment at temperatures above the Tg of the polymer can decrease drug release rate. In this research we studied the mechanism of the effect of thermal treatment on Eudragit RS matrices. Indomethacin was used as model drug. The results showed that polymer chain movement and redistribution of the polymer in the tablet matrix structure after thermal-treating is the possible mechanism of drug release prolongation. The melting and resolidification of the polymer, due to the thermal treatment has apparently resulted in a redistribution of the polymer throughout the matrix and a change in the porosity of the tablet. FTIR results did not show any drug–polymer interaction due to heat-treatment. DSC and PXD studies ruled out the occurrence of solid solution and polymorphic change of the drug.

Item Type: Article
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > Medway School of Pharmacy
Depositing User: Ali Nokhodchi
Date Deposited: 05 Sep 2008 13:22
Last Modified: 03 Jun 2014 08:57
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