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Study on entrapment efficiency, drug release in vitro and stability of Crebanine long circulating liposome |
LIU Na WANG Qilei CHEN Lingyun MA Yunshu |
Yunnan University of TCM, Yunnan Province, Kunming 650500, China |
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Abstract Objective To study the entrapment efficiency, drug release in vitro and stability of Crebanine long circulating liposome. Methods The concentration of Crebanine in long circulating liposome was determined by high performance liquid chromatography. The liposome and free Crebanine were separated by the sephadex gel column chromatography and the centrifugal ultrafiltration, the entrapment efficiency and drug loading were determined. The release behavior of the drug from liposome was studied by the dialysis method. The liposome appearance, particle size and leakage rate were studied by the effects of different temperature and light storage. Results The entrapment efficiency was 79.46% by the gel column chromatography and 81.02% by the centrifugal ultrafiltration. Crebanine long-circulating liposome drug loading was 5.6%; the Higuchi equation of Crebanine long-circulating liposome in vitro release was y = 0.1419 x1/2+ 0.1475, the R2 value was 0.9338; Crebanine long-circulating liposome was stabilized in the avoid light of 4℃ under refrigeration. Conclusion The centrifugal ultrafiltration is simple and reproducible. The prepared liposome is typical sustained-release, the liposome needs to be kept in cold storage.
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