[Optimization of preparation parameters for gentamicin-loaded PLLA nanoparticles and the drug release behavior in...

It has been one of important issues in nanomedicine research field to prepare drug-loaded nanoparticles. Optimization of the preparation parameters plays a key role in obtaining drug-loaded nanoparticles with homogeneous particle size and controlled drug release property. In this paper, gentamicin-loaded PLLA nanoparticles was prepared by means of double emulsion and solvent evaporation technique. Statistical software SPSS was employed to deal with the orthogonal design for optimizing the parameters of the formulation. The in vitro release of gentamicin from nanoparticles was determined by ultra-violet spectroscopy. Analysis of the experimental data based on orthogonal design demonstrated that the concentration of PLLA solution and the molecular weight of PLLA had significant influence on the size of nanoparticles, and the ratio of oil phase to water phase exhibited determined role in the gentamicin release property. Gentamicin-loaded PLLA nanoparticles prepared with the optimized parameters showed homogeneous particle size of 277 nm and sustained release property, which displayed a promising potential of clinical applications.