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Proceedings Paper

Phthalocyanine-assisted photodynamic inactivation of pathogenic microorganisms
Author(s): Vanya Mantareva; Ivan Angelov; Ekaterina Borissova; Latchezar Avramov; Vesselin Kussovski
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Paper Abstract

The phthalocyanine zinc(II) and aluminum (III) complexes were studied to photoinactivate the bacterial strains, Staphylococcus aureus, methacillin-sensitive and methacillin-resistant, Pseudomonas aeruginosa and one yeast Candida albicans. The binding of phthalocyanines to bacteria and fungi cells was evaluated by the means of laserinduced fluorescence technique. The fluorescent spectra of dyes (650 - 800 nm) after direct excitation (635 nm) were measured as follows: 1. for the aqua supernatants obtained after 10 min cell incubation with the respected phthalocyanines (1.6 &mgr;mol.l-1), 2. for the washed from the unbound dye cells, and 3. for the organic extracts from the three times washed cells. Fluorescent intensities at the emission maximum (~690 nm) were compared to the spectra of the phthalocyanines in organic solutions. The phthalocyanines uptake data for bacteria and fungi were determined at different cell densities. Nevertheless the better fluorescence properties of AlPc (fluorescent quantum yield of 0.4 towards 0.3 for ZnPcs) the lower drug accumulation in microorganisms was obtained. PDI results indicated an intensive lowering of the bacterial survival of both strains of S. aureus treated with cationic ZnPcMe followed by the anionic ZnPcS, at irradiance of 100 mW cm-2 and fluence rate of 60 J cm-2. More resistant to phototreatment P. aeruginosa and morphologically complicated yeast C. albicans were successfully inactivated only with cationic ZnPcMe. These data indicate the promising future application of cationic phthalocyanine in photodynamic inactivation of pathogenic microorganisms.

Paper Details

Date Published: 5 March 2007
PDF: 5 pages
Proc. SPIE 6604, 14th International School on Quantum Electronics: Laser Physics and Applications, 66042A (5 March 2007); doi: 10.1117/12.727717
Show Author Affiliations
Vanya Mantareva, Institute of Organic Chemistry (Bulgaria)
Ivan Angelov, Institute of Organic Chemistry (Bulgaria)
Ekaterina Borissova, Institute of Electronics (Bulgaria)
Latchezar Avramov, Institute of Electronics (Bulgaria)
Vesselin Kussovski, The Stephan Angeloff Institute of Microbiology (Bulgaria)

Published in SPIE Proceedings Vol. 6604:
14th International School on Quantum Electronics: Laser Physics and Applications

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