Preparation and characterization of PCL-PEG-PCL polymersomes for delivery of clavulanic acid

The Clavulanic acid (CLV) is a suicide inhibitor of bacterial beta-lactamase enzymes from Streptomyces clavuligerus. In the present study, a reliable drug delivery system using poly (ε-caprolactone)-poly (ethylene glycol)-poly (ε-caprolactone) (PCL-PEG-PCL) was synthesized and the release profile of the CLV from the drug-loaded polymersomes was evaluated. In this study, CLV was encapsulated within PCL-PEG-PCL nanoparticles by a double emulsion technique (w/o/w), leading to creation of CLV-loaded PCL-PEG-PCL (CLV/PCL-PEG-PCL) polymersomes. Characterization, stability of polymersomes, the particle size was determined by DLS. The release profile of the CLV from the polymersomes which ready by the drug-loaded copolymer, was evaluated. Our studies resulted in a successful establishment of uniformity and spherical CLV-loaded PCL-PEG-PCL polymersomes. The loading efficiency of CLV was 16.00 ± 1.45%. The results of DLS show that the polymersomes have spherical shapes with size of 113 nm. In vitro release of CLV from CLV-entrapped polymersomes was remarkably sustained. The results indicate the successful formulation of curcumin loaded PCL-PEG-PCL polymersomes.