Preparation and in vitro evaluation of ofloxacin liposomes for increasing bacteria sensitivity
- Author:
Gang HAN
1
Author Information
- Publication Type:Journal Article
- Keywords: Baclerostatic test; Dilution test; Disc diffusion test; Liposome; Ofloxacin; PH gradient method
- From: Chinese Pharmaceutical Journal 2013;48(8):612-615
- CountryChina
- Language:Chinese
- Abstract: OBJECTIVE: To prepare ofloxacin liposomes for increasing bacteria sensitivity, and lo evaluate its in vitro properly. METHODS: Ofloxacin liposomes were prepared by pH gradient method using phospholipid and cholesterol as materials. The effects of pH value and the warming temperature and time on encapsulation efficiency were investigated. The particle size of liposomes was determined and the morphology was investigated by transmission electric microscope (TEM). The in vitro release experiment was carried out vising physiological saline as the medium. The bacteriostatic action against Staphylococcus aureus was investigated using disc diffusion test and dilution test. RESULTS: The maximum encapsulation efficiency of 82.40% could be achieved when pH value was 7.0, warming temperature was 50°C and warming time was 5 min. The average particle size of the liposomes was 174nm, and the ofloxacin liposomes showed good morphology under TEM. The liposomes could release ofloxacin in a sustained manner in vitro. The ofloxacin liposomes and solution showed same inhibition zones in disc diffusion test, while their minimal inhibitory concentrations determined by dilution test were 0.39 and 0.78μg · mL-1, respectively. CONCLUSION: Ofloxacin liposomes can be prepared by pH gradient method with high encapsulation efficiency, and the bacteriostatic effect of ofloxacin against Staphylococcus aureus can be improved by incorporating it into liposomes.
