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The purpose of this study is to investigate the process of drug distribution and mechanism of drug release of ophthalmic emulsions in the context of factors associated with the drug release. Cyclosporine and difluprednate emulsions were chosen as model systems. A kinetic method was used to quantitatively evaluate the drug distribution within a simplified biphasic (emulsion) system. The impacts of release associated factors were investigated, including the amount of sodium dodecyl sulfate (SDS), ethanol, and ionic strength in the release