Abstract
The polarity of oleic acid, medium-chain triglyceride and their mixtures with different ratios was determined by LB film technology. Then the particle diameter after emulsifying in water when these different oils were mixed with Cremophor EL-35 respectively was assayed. Then three formulations of SMEDDS using different oils were prepared. And their surface pressure-area isotherm curves and Gibbs change (ΔG) were investigated. The results showed that flexibility of LB film was much better when oil with lower polarity was used to prepare the SMEDDS. And this group of SMEDDS which has low Gibbs change (ΔG) was more stable with appropriate composition of oil, surfactant and co-surfactant. It can be concluded that LB film technology could be applied on the preliminary formulation study of SMEDDS. Our study may provide some theoretical basis and methods of formulation selection of SMEDDS.
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