RESUMO
Objective To prepare vinorelbine bitartrate long-circulation liposomes by pH gradient loading methods and make characterization. Methods The impact of hydration temperature and extrusion times on the blank liposome particle size was investigated;and the incubation temperature and in duration on size and encapsulation percentage of drug loading liposome particle was tested. The vinorelbine bitartrate long-circulation liposome was characterized for particle size,polydispersion index, Zeta potential,morphology,and was studied for long term stability. Results The particle size,Zeta potential,polydispersion in-dex of long-circulation liposomes were (96. 4±27. 2) nm,(0. 162±0. 042),(-26. 7±3. 5) mV,respectively. The liposomes were small,unilamellar and spherical with smooth surface under transmission electron microscopy. Long term stability studies showed that the liposomes were stable for up to 3 months after storage at 5 ℃ . Conclusion The preparation technology for the vinorel-bine bitartrate long-circulation liposome by pH gradient loading methods is feasible.