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Proceedings Paper

Antimicrobial photodisinfection with Zn(II) phthalocyanine adsorbed on TiO2 upon UVA and red irradiation
Author(s): Vanya Mantareva; Ivelina Eneva; Vesselin Kussovski; Ekaterina Borisova; Ivan Angelov
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Paper Abstract

The light exposure on a daily basis has been well accepted as a competitive method for decontamination of wastewater. The catalytic properties of TiO2 offer a great potential to reduce the transmission of pathogens in the environment. Although the titanium dioxide shows high activity against pathogens, its general usage in water cleaning is limited due to the insufficient excitation natural light (about 3% of the solar spectrum). A hydrophobic dodecylpyridyloxy Zn(II)-phthalocyanine with four peripheral hydrocarbon chains of C12 (ZnPcDo) was immobilized on a photocatalyst TiO2 anatase (P25). The resulted greenish colored nanoparticles of phthalocyanine were characterized by the means of absorption, fluorescence and infrared spectroscopy. The laser scanning confocal fluorescence microscopy was used to visualize the phthalocyanine dye by the red fluorescence emission (650 – 740 nm). The intensive Q-band in the far red visible spectral region (~ 690 nm) suggested a monomeric state of phthalocyanine on TiO2 nanoparticles. Two pathogenic bacterial strains (methicillin-resistant Staphylococcus aureus - MRSA and Salmonella enteritidis) associated with wastewater were photoinactivated with the suspension of the particles. The effective photoinactivation was observed with 1 g.L-1 TiO2 anatase at irradiation with UVA 364 nm as with UVA 364 nm and LED 643 nm. The gram-negative Salmonella enteritidis was fully photoinactivated with ZnPcDo-TiO2 and TiO2 alone at UVA 346 nm and at irradiation with two light sources (364 nm + 643 nm). The proposed conjugate appears as an useful composite material for antibacterial disinfection.

Paper Details

Date Published: 8 January 2015
PDF: 9 pages
Proc. SPIE 9447, 18th International School on Quantum Electronics: Laser Physics and Applications, 94470W (8 January 2015); doi: 10.1117/12.2084307
Show Author Affiliations
Vanya Mantareva, Institute of Organic Chemistry with Ctr. of Phytochemistry (Bulgaria)
Ivelina Eneva, Institute of Organic Chemistry with Ctr. of Phytochemistry (Bulgaria)
Vesselin Kussovski, The St. Angeloff Institute of Microbiology (Bulgaria)
Ekaterina Borisova, Institute of Electronics (Bulgaria)
Ivan Angelov, Institute of Organic Chemistry with Ctr. of Phytochemistry (Bulgaria)

Published in SPIE Proceedings Vol. 9447:
18th International School on Quantum Electronics: Laser Physics and Applications
Tanja Dreischuh; Sanka Gateva; Alexandros Serafetinides, Editor(s)

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