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Preparation and Quality Evaluation of Enramycin Self-Microemulsifying Drug Delivery System

??OBJECTIVE To prepare enramycin self-microemulsifying drug delivery system (SMEDDS) and evaluate its quality. METHODS The formulations of enramycin SMEDDS were screened by solubility experiment and self-emulsifying grading test. The formulation was optimized using Design Expert Software, taking particle size as dependent variable and the usage amoumts of oil, surfactant, and cosurfactant as independent variables. RESULTS The optimized formulation of enramycin SMEDDS consisted of 20% ethyl oleate, 40% RH40, and 40% 1,2-propylene glycol. 1.0 g mixture contained 20 mg enramycin, which dispersed rapidly into water and the particle size of the formed emulsion was (27.81??0.79)nm. The enramycin SMEDDS dissolved by more than 90% within 10 min, much faster than that of enramycin API. The particle size and concentration of SMEDDS were stable at alternative temperature cycles (4 and 40 ??) for 48 h, and the SMEDDS formulation had no effect on the bacteriostasis of enramycin. CONCLUSION The quality of enramycin SMEDDS is stable. The system increases the dissolution of enramycin significantly and could be advantageous to improve the oral bioavailability of enramycin.