Exploring anti-MRSA activity of chitosan-coated liposomal dicloxacillin.

One of the greatest disturbing global health problems is antibiotic-resistant bacterial infections, which have rendered numerous currently used antibiotics ineffective. Thus, the feasibility of chitosan-coated deformable liposomes (C-Lips) containing dicloxacillin (DLX) were evaluated for their efficacy against methicillin-resistant Staphylococcus aureus (MRSA) strains, which are resistant to beta lactam antibiotics. DLX-loaded liposomes (DLX-Lip) were prepared by a lipid film hydration method and then chitosan (CS) coated (C-DLX-Lip) by the electrostatic deposition method. Both DLX-Lips and C-DLX-Lips showed a particle size distribution with a nano-range and a narrow polydispersity index (PDI). After CS coating, the zeta potential was shifted from negative to positive value. The DLX entrapment efficiency (EE) and drug loading (DL) were 62% and 5.6% for C-DLX-Lips compared to 38% and 3.1% for DLX-Lip, respectively. The in vitro release profile of C-DLX-Lips possessed a slow release behavior. Moreover, the DLX-Lips and C-DLX-Lips demonstrated an enhanced anti-MRSA activity. These results revealed that DLX-Lips and C-DLX-Lips may serve as promising carriers for DLX to increase the efficacy against MRSA, which offers considerably clinical value for long-term use of DLX.