Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
Lu, Z., Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa; Chen, W., Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa; Hamman, J.H., Department of Pharmaceutical Sciences, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
Purpose: It was previously shown in our laboratories that the interpolyelectrolyte complex between chitosan and polycarbophil has promise as a matrix former to control the release of water-soluble drugs. This study further investigates the applications of this polymeric complex to produce controlled release matrices for poorly water-soluble drugs. Methods: The swelling, erosion, and drug release performance of matrix-type tablets containing the chitosanpolycarbophil complex as matrix former was compared to those consisting of hydroxypropylmethylcellulose and a simple mixture of chitosan and polycarbophil powders. Results: The chitosanpolycarbophil complex matrices showed good swelling with relatively low erosion and slower drug release compared to those prepared from other polymeric materials. They also exhibited release exponent (n) values closer to unity and therefore to zero-order release compared to the other matrices. Conclusions: The chitosanpolycarbophil complex formed matrix-type tablets that controlled the release of poorly water-soluble drugs approaching zero-order kinetics. The mechanism of drug release was mainly diffusion from swollen systems. © 2010 Informa UK, Ltd.
chitosan; hydrochlorothiazide; hydroxymethylcellulose; ketoprofen; polycarbophil; polymer; article; controlled drug release; controlled release formulation; controlled study; diffusion; drug solubility; in vitro study; powder; tablet formulation; Acrylic Resins; Chitosan; Delayed-Action Preparations; Drug Evaluation, Preclinical; Pharmaceutical Preparations; Polymers; Random Allocation; Solubility; Water