Abstract
The purpose of this study was to examine the effect of processing parameters on drug release profiles of microparticles. Double emulsion solvent evaporation technique was utilized to encapsulate donepezil hydrochloride which is a hydrophilic drug. The processing parameters examined were polymer amount, stirring time and volume of external aqueous phase. The morphology of microparticles was observed under light microscope and scanning electron microscope. After that, in vitro drug release testing was conducted in simulated salivary fluid (pH6.75) and simulated gastric fluid (pH1.2). The results showed that these three parameters were the significant parameter affecting drug release profiles of the microparticles.
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