The present investigation was aimed to enhance dissolution of sirolimus by liquid and solid selfmicroemulsifying
drug delivery systems (SMEDDS). Solubility of sirolimus was determined in various vehicles, including
oils, surfactants and co-surfactant. Emulsification study was conducted to identify the most suitable ratio of Oil:Smix
(mixture of surfactant and co-surfactant). Various in vitro tests like emulsification time, cloud point, precipitation and
thermodynamic stabilities were used to determine the composition of optimized formulation. SMEDDS with optimum
composition were converted to solid using Florite RE. Adsorbed SMEDDS were further characterized by differential
scanning calorimetry (DSC), scanning electron microscopy (SEM), X-ray diffraction (XRD) and particle size analysis.
DSC, XRD and SEM results of solid SMEDDS confirmed that the drug presented in the formulation was in an amorphous
state. The optimized liquid and solid SMEDDS showed higher drug release than the powder sirolimus and found stable
upto 2 months.
Keywords: Capmul MCM C-8, Captex 200, florite RE, solid SMEDDS, sirolimus.
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