The entrapment efficiencies with pH transmembrane gradients and ammonium sulfate transmembrane gradients were 86.9% and 70.8%, respectively, while up to 92.8% and 97.6% with the incorporation of CHS-PEG2000 ( methoxypolyethyene glycol 2000 cholesteryl succinate) in liposomal formulation. 以pH梯度法和(NH4)2SO4梯度法制备的脂质体包封率分别为86.9%,70.8%;加入聚乙二醇单甲醚2000胆固醇琥珀酸酯(methoxypolyethyeneglycol2000cholesterylsuccinate,CHS-PEG2000),包封率提高到92.8%,97.6%。