Suspensions of prolonged-release diclofenac-Eudragit and ion-exchange resin microcapsules: II. Improved dissolution stability

Journal of Microencapsulation
M C AdeyeyeY Fukumori


The stability of prolonged release 100 microm -size ion-exchange resin (IER) diclofenac microcapsules (prepared by the Wurster process) and coated with Eudragit RS30D was evaluated using dissolution analysis. The IER microcapsules were suspended in 0.1% methylcellulose and stored at 23 and 37 degrees C and the dissolution study conducted over a 6-month period. The surface morphology of the microcapsules was examined using scanning electron microscopy (SEM). The dissolution of the suspensions stored at 23 degrees C on day 1 or 7 and was similar to that of day 30 with slightly faster dissolution on day 60. In contrast, release from suspensions stored at 37 degrees C decreased with storage. The decrease in dissolution with increased temperature was possibly due to the polymer relaxation (micromelting) that was enough to seal the drug within the matrix, resulting in slow dissolution. SEM of the suspended microcapsules correlated with the dissolution data, i.e. the surfaces of microcapsule stored at 37 degrees C showed decreased roughness or smoothening and closing of pores with time and, hence, retardation of drug release, compared with samples stored at 23 degrees C. The dissolution kinetics (shown by the linearity of Bt vs. time ...Continue Reading


Aug 4, 2007·Journal of Pharmaceutical Sciences·Beatrice AlbertiniLorenzo Rodriguez
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