Porphyrin-cellulose nanocrystals: a photobactericidal material that exhibits broad spectrum antimicrobial activity

Photochemistry and Photobiology
Bradley L CarpenterReza A Ghiladi

Abstract

Towards our overall objectives of developing potent antimicrobial materials to combat the escalating threat to human health posed by the transmission of surface-adhering pathogenic bacteria, we have investigated the photobactericidal activity of cellulose nanocrystals that have been modified with a porphyrin-derived photosensitizer (PS). The ability of these previously synthesized porphyrin-cellulose-nanocrystals (CNC-Por (1)) to mediate bacterial photodynamic inactivation was investigated as a function of bacterial strain, incubation time and illumination time. Despite forming an insoluble suspension, CNC-Por (1) showed excellent efficacy toward the photodynamic inactivation of Acinetobacter baumannii, multidrug-resistant Acinetobacter baumannii (MDRAB) and methicillin-resistant Staphylococcus aureus (MRSA), with the best results achieving 5-6 log units reduction in colony forming units (CFUs) upon illumination with visible light (400-700 nm; 118 J cm(-2)). CNC-Por (1) mediated the inactivation of Pseudomonas aeruginosa, although at reduced activity (2-3 log units reduction). Confocal laser scanning microscopy of CNC-Por (1) after incubation with A. baumannii or S. aureus suggested a lack of internalization of the PS. Research...Continue Reading

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