Preparation and characterization of a novel starch-based interpolyelectrolyte complex as matrix for controlled drug release

A novel cationized starch-based interpolyelectrolyte complex (IPEC) was formed using kappa-carrageenan as the counter polyion. Characterization of the product by turbidity measurements and elemental analyses indicated a 1:1 interaction of the repeating units. FT-IR spectra for the IPEC showed some differences in comparison with either IPEC constituents or physical mixture. The swelling of tablets obtained by direct compression was independent of pH, and a maximum value of 742% was attained after 24 h. The performance of the IPEC as matrix for controlled release of ibuprofen indicates that drug delivery takes place in a zero-order manner. Experimental dissolution data in the buffer stage were properly represented by a model accounting for contributions of Fickian diffusion and relaxation phenomena; this model suggests that the former predominates over the latter, for the modeled range.

The interpolyelectrolyte complex was characterized and its performance for controlled release was studied.Figure optionsDownload as PowerPoint slide