ABSTRACT
OBJECTIVE:To prepare and characterize capreomycin sulfate liposomes(CSL).METHODS:Capreomycin sulfate was entrapped into liposomes using active loading that pH gradient methods,ammonium sulfate gradient methods and sodium acetate gradient methods respectively followed by lyophilization technique.The liposome was characterized by entrapment efficiency,particle size,? potential and the stability.RESULTS:The entrapment efficiency of CSL pre-and post-lyophilization prepared by three methods were 65.7% and 65.2 %,20.1% and 18.6%,34.6% and 32.4%,with particle size of 136 and 145 nm,144 and 153 nm,142 and 159 nm,? potential of —20.2 and —19.5 mV,—24.4 and —22.9 mV,—18.7 and —17.8 mV respectively.No obvious changes were found in all the indexes in the stability test.CONCLUSIONS:The pH gradient technique is suitable for preparing CSL in 3 kinds of methods.