Photodynamic inactivation of Aeromonas hydrophila by cationic  phthalocyanines with different hydrophobicity.
Antibacterial photodynamic therapy is a pioneering method for the inactivation of pathogenic bacteria. Four tetra alkyl-substituted cationic phthalocyanines with different hydrocarbon chains attached to the pyridyloxy group were synthesized. These photodynamic sensitizers were studied for antibacterial inactivation of a multidrug-resistant strain of Gram-negative bacterium Aeromonas hydrophila. Aeromonas species are recognized as etiological agents of a wide spectrum of diseases in humans and animals. The uptake of phthalocyanines by the bacterial cells decreased with an increase in cell density. Following the phthalocyanine solubility from hydrophilic to hydrophobic complexes, the accumulation capacity increased. Full inactivation was achieved with phthalocyanine with (methoxy) pyridyloxy substitution following a short exposure time, low drug concentration and mild irradiation. Although the phthalocyanine with the longest hydrocarbon chain (C12) has some toxic effect in the absence of light, substantial phototoxic effect was obtained with the optimal combination of drug-irradiation parameters.
Department of Pathogenic Bacteria, The Stephan Angeloff Institute of Microbiology, Bulgarian Academy of Sciences, Sofia, Bulgaria. vkussovski@yahoo.com
Veselin
V
Kussovski
Vanya
V
Mantareva
Ivan
I
Angelov
Petya
P
Orozova
Dieter
D
Wöhrle
Günter
G
Schnurpfeil
Ekaterina
E
Borisova
Latchezar
L
Avramov
D016980:Aeromonas hydrophila / Q000187:drug effects / Q000528:radiation effects; D004305:Dose-Response Relationship, Drug; D004307:Dose-Response Relationship, Radiation; D024901:Drug Resistance, Multiple, Bacterial; D016905:Gram-Negative Bacterial Infections / Q000188:drug therapy*; D006801:Humans; D057927:Hydrophobic and Hydrophilic Interactions; D007211:Indoles / Q000008:administration & dosage / Q000493:pharmacokinetics*; D008027:Light / Q000009:adverse effects; D010778:Photochemotherapy; D017319:Photosensitizing Agents / Q000008:administration & dosage / Q000493:pharmacokinetics*
D007211:Indoles; D017319:Photosensitizing Agents