Evaluation of in vitro release kinetics of Capsaicin-loaded chitosan nanoparticles using DDSolver

The present aim is to evaluate the release profile and its release kinetics of encapsulated capsaicin from chitosan nanoparticles using the software DDSolver. The release study was performed by using a dialysis technique in PBS solutions with different pHs (1.2, 6.8 and 7.4) to mimics the different gastrointestinal tract and circulatory system pH ranges as a releasing medium. The nanoparticles were prepared using o/w emulsification and ionotropic gelation technique under optimal condition obtained from response surface methodology (RSM) design as described in our previous study. These nanoparticles were around 180 nm in average hydrodynamic size and encapsulation efficiency percentage around 70%, respectively. In vitro drug release study suggested that the chitosan nanoparticles can potentially use to controlled and sustained release of capsaicin over at least 96. The kinetic release analysis results by DDSolver software indicated that Weibull model was suggested to be the best dynamic models with highest R2adjusted and model selection criteria (MSC) and lowest Akaike information criterion (AIC), respectively, for capsaicin loaded chitosan nanoparticles. The release mechanism of capsaicin from nanoparticles was found to be Fickian diffusion. The results suggest that the chitosan nanoparticles can be applied for the controlled and sustained release of capsaicin in the gastrointestinal tract and circulatory system.