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ZHOU Weisai, WU Zimei, BAGULEY Bruce C., LI Caibin, ZHANG Wenli, LIU Jianping. Preparation of CI-921 mixed micelles and determination of its entrapment efficiency by method of dialysis and fitting[J]. Journal of China Pharmaceutical University, 2016, 47(5): 575-580. DOI: 10.11665/j.issn.1000-5048.20160512
Citation: ZHOU Weisai, WU Zimei, BAGULEY Bruce C., LI Caibin, ZHANG Wenli, LIU Jianping. Preparation of CI-921 mixed micelles and determination of its entrapment efficiency by method of dialysis and fitting[J]. Journal of China Pharmaceutical University, 2016, 47(5): 575-580. DOI: 10.11665/j.issn.1000-5048.20160512
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Preparation of CI-921 mixed micelles and determination of its entrapment efficiency by method of dialysis and fitting

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  • The aim of this research were to prepare CI-921 mixed micelles(CI-Micelles), to establish a method for determining the entrapment efficiency of CI-Micelles, to optimize the formulation and to evaluate their in vitro properties. CI-Micelles were prepared by film dispersion. Dialysis and fitting were used to calculate true entrapment efficiency(EE)and drug loading(DL)of CI-Micelles. The influences of polymer concentration, polymer radio and hydrating media on the entrapment efficiency, drug loading and particle-size were investigated. The stability at 4 °C in 6 days was evaluated. The optimal formulation of CI-921-Micelles consisting of polymer concentration of 72 mg/mL, a mass radio of Pluronic F127/Solutol HS15 at mass ratio of 1 ∶2 and 5% glucose solution as hydrating medium, showed a EE of more than 90%, and mean particle-size of 17-25 nm and PDI< 0. 210. There were no significant changes to CI-Micelles in EE and particle-size after treatment at 4 °C for 6 days. The applied method of dialysis and fitting could be used to determine EE for micelles loaded with weakly basic drug which was difficult to meet sink conditions. Adjustment of the mass radio of Pluronic F127 to Solutol HS15 had resulted in uniform particle size distribution, high entrapment efficiency and drug loading capacity and better stability of CI-Micelles.
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