Objective:To optimize the formula composition of rutin self-microemulsifying drug delivery system by pseudo-ternary phase diagram.Methods:The oil, surfactant and co-surfactant were chosen by the solubility test , and the formula of rutin self-microe-mulsifying drug delivery system was optimized by pseudo-ternary phase diagram .Results: The formula of rutin self-microemulsifying drug delivery system was with the mass ratio of oleic acid , Cremopher RH40 and absolute ethyl alcohol of 23∶36∶12 .The microemul-sion was clear transparent liquid .Conclusion:The prepared rutin self-microemulsifying drug delivery system using the optimized for-mula screened by pseudo-ternary phase diagram can increase the solubility of rutin significantly .
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