Unveiling the influence of oxygen on drug release dynamics in semipermeable polymersomes.

Semipermeable polymersomes, a class of polymeric vesicles that allow molecular passage across their membranes, offer significant potential for controlled drug delivery. These vesicles can be designed for inherent or selective permeability through the choice of suitable copolymers or the incorporation of protein nanopores, respectively. In this study, we explore a novel approach using oxygen-producing enzymatic reactions within biodegradable poly(ethylene glycol)-poly(caprolactone-gradient-trimethylene carbonate) (PEG-p(CL-g-TMC)) polymersomes to modulate drug release. These polymersomes were found to enhance the release of hydrophobic drugs while retaining hydrophilic drugs. The enzymatic generation of oxygen within the polymersomes increased membrane hydrophobicity, influencing drug release kinetics. The findings highlight the importance of understanding drug release kinetics in designing effective drug delivery systems, as the release rate and mechanism critically impact therapeutic efficacy and patient outcomes.