Objective: To develop self-microemulsifying preparations of total flavones of Hippophae Rhamnoides L. (TFH) and the determination method of dissolution.
Method: The equilibrium solubility of TFH in different compositions of oils, emulsifier and assistant emulsifier was investigated. The self-microemulsion formula was optimized by constructing the pseudo-ternary phase diagrams of blank SMEDDS determining the self-microemulsifying efficiency and the stability of the SMEDDS. The 2 hours dissolution curve of TFH self-microemulsifying preparations was established. The optimal self-microemulsion formula was composed of MIGLYOL 812 N, Cremophor EL and 1,2-Propylene glycol.
Result: The ratio of them was 0.5:5.7:3.8. The average particle size was 12.1 nm. The dissolution rate at 10 minutes of TFH self-microemulsifying preparation was 131% higher than that of Xinda kang tablets.
Conclusion: The acquired microemulsion with small particle size is stable. The dissolution rate is evidently improved compared with market dosage forms.