Photosensitiser-incorporated microparticles for photodynamic inactivation of bacteria

Antimicrobial resistance is an ever-growing global concern, making the development of alternative antimicrobial agents and techniques an urgent priority to protect public health. Antimicrobial photodynamic therapy (aPDT) is one such promising alternative, which harnesses the cytotoxic action of reactive oxygen species (ROS) generated upon irradiation of photosensitisers (PSs) with visible light to destroy microorganisms. In this study we report a convenient and facile method to produce highly photoactive antimicrobial microparticles, exhibiting minimal PS leaching, and examine the effect of particle size on antimicrobial activity. A ball milling technique produced a range of sizes of anionic p(HEMA-co-MAA) microparticles, providing large surface areas available for electrostatic attachment of the cationic PS, Toluidine Blue O (TBO). The TBO-incorporated microparticles showed a size-dependent effect on antimicrobial activity, with a decrease in microparticle size resulting in an increase in the bacterial reductions achieved when irradiated with red light. The >6 log10 Pseudomonas aeruginosa and Staphylococcus aureus reductions (>99.9999%) achieved within 30 and 60 min, respectively, by TBOincorporated >90 mu m microparticles were attributed to the cytotoxic action of the ROS generated by TBO molecules bound to the microparticles, with no PS leaching from these particles detected over this timeframe. TBO-incorporated microparticles capable of significantly reducing the bioburden of solutions with short durations of low intensity red light irradiation and minimal leaching present an attractive platform for various antimicrobial applications.

Automated summary

Antimicrobial resistance is a growing global concern, and the development of alternative antimicrobial agents and techniques is crucial. Antimicrobial photodynamic therapy (aPDT) is a promising alternative that uses visible light to destroy microbes. This study presents a convenient method to produce highly photoactive antimicrobial microparticles, which showed a size-dependent effect on antimicrobial activity. The incorporation of a cationic photosensitizer onto the microparticles resulted in significant bacterial reductions when irradiated with red light, without any leaching of the photosensitizer.