Photopolymerized Poly Ethylene Glycol Diacrylate Hydrogels for Controlled Release of Ketoprofen

Year 2009, Volume: 37 Issue: 4, 337 - 343, 01.12.2009

Nazlı Sökmen Seda Uysal Fatma Ayhan Mine Özyazıcı Hakan Ayhan

Abstract

In this study, poly ethylene glycol-diacrylate PEG-DA hydrogels with two different concentrations, 30% and 50% w/w, were prepared by free radical polymerization method. Ethylene glycol dimethacrylate EGDMA and 2,2-dimethoxy-2-phenyl-acetophenone DMPA were used as cross-linking agent and photoinitiator, respectively. The model drug ketoprofen KP was incorporated into the hydrogel during photopolymerization and its release kinetics was tested spectrophotometrically at 256 nm in different buffer solutions of pH 7.5, 4.5, and 1.2. The results showed that the release of KP strongly depends on the dissolution of drug, initial polymer concentration, and the pH of the release medium. All of the obtained results were evaluated kinetically by first order and zero order, Higuchi and Hixon-Crowell kinetic models. The release mechanism was found to obey Higuchi and first order kinetics when the release data of the formulations were applied to the models in the different pH mediums.

Keywords

Hydrogel, Drug delivery, PEG-DA, Photopolymerization, Ketoprofen, Drug release models

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