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Forum on Immunopathological Diseases and Therapeutics
SJR: 0.309 SNIP: 0.041 CiteScore™: 0.18

ISSN Imprimer: 2151-8017
ISSN En ligne: 2151-8025

Archives: Volume 1, 2010 to Volume 7, 2016

Forum on Immunopathological Diseases and Therapeutics

DOI: 10.1615/ForumImmunDisTher.2011004399
pages 255-260

Porphyrin-Photosensitized Processes: An Environmentally Friendly Approach to Water Disinfection

Michela Magaraggia
University of Padova
Jerry Bommer
Frontier Scientific, Logan, Utah, USA
Giulio Jori
Department of Biology, University of Padova, Via Ugo Bassi 58B, 35121 Padova, Italy
Olimpia Coppellotti
Department of Biology, University of Padova, Padova, Italy
70 papers in international journals; 80 communications at international congresses; 1 Laboratory Guide on Invertebrate Zoology; Italian edition of 4 texts of Zoology
Laura Guidolin
Department of Biology, University of Padova, Padova, Italy


Waterborne diseases are characterized by an increased frequency and poorly efficacious treatment approaches owing to the variety of pathogenic agents and the development of resistance to chemical or physical strategies for water disinfection. Our groups are testing the potential of photodynamic processes promoted by porphyrins bound to inert supports which allow an efficient recovery and reuse of the photosensitizer and prevent its direct interaction with normal components of the ecosystems, as well as its diffusion in the environment. Thus, we investigated the sensitivity of a Gram-positive bacterium (meticillin-resistant Staphylococcus aureus) and a Gram-negative bacterium (Escherichia coli) to irradiation with visible light in the presence of a tetracationic porphyrin, meso-tri(N-methyl-pyridyl), mono(N-dodecyl) porphine (C12) associated with different resins. The efficiency of the photosensitized antibacterial effect was found to be largely influenced by the nature of the carrier. Thus, by using milligrams of porphyrin bound to carboxymethyl-cellulose and relatively low-intensity visible light, an extensive (up to 5−6 log) decrease in the bacterial population after 1 h incubation and a 30 min irradiation was observed. These results yield promising novel perspectives for further developing such porphyrin-photosensitized processes into a flexible and valuable technique for environmentally friendly treatment of microbiologically polluted aquaculture systems.

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