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Bradley L. Carpenter, Elke Feese, Hasan Sadeghifar, Dimitris S. Argyropoulos and Reza A. Ghiladi Porphyrin-Cellulose Nanocrystals: A Photobactericidal Material that Exhibits Broad Spectrum Antimicrobial Activity† Photochemistry and Photobiology 88

Version of Record online: 28 MAR 2012 | DOI: 10.1111/j.1751-1097.2012.01117.x

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To combat the escalating threat to human health posed by the transmission of pathogenic bacteria that adhere to surfaces, we investigated the photobactericidal activity of cellulose nanocrystals that have been modified with a porphyrin-derived photosensitizer. These porphyrin-cellulose nanocrystals exhibited broad spectrum antimicrobial activity, with the best results achieving an impressive 5–6 log units reduction in colony forming units (99.999 + % killing) for Acinetobacter baumannii, multidrug-resistant Acinetobacter baumannii (MDRAB), and methicillin-resistant Staphylococcus aureus (MRSA), and a noteworthy 99.9 + % sterilization of Pseudomonas aeruginosa.

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