Izvestiya of Saratov University.

Chemistry. Biology. Ecology

ISSN 1816-9775 (Print)
ISSN 2541-8971 (Online)

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Antimicrobial Photodynamic Effects Using Coatings Based on Metal Nanoparticles (Ag, Au)

Tuchina Elena S., Saratov State University
Gvozdev German A., Yuri Gagarin State Technical University of Saratov
Kosobudskiy Igor D., Yuri Gagarin State Technical University of Saratov
Shih Wei-Chuan, University of Houston
Tuchin Valeriy V., Saratov State University

The combined effect of coatings based on nanoparticles of metals Ag, Au, ultraviolet (365 nm, UVR) and infrared (808 nm, IRR) radiation on Staphylococcus aureus 209 P was studied. Decrease in numbers was shown by 2% in the case of silver coatings and by 8% in the case of gold coatings after 1 h incubation. However, exposure of the IRR to bacterial suspensions caused the death of 43% of the population after 5 min, 86% of the population after 30 min. The decrease in the number of the studied microorganisms was measured as 21% after 5 min and by 75% after 30 min of exposure to silver nanocoatings in combination with UVR (365 nm). The decrease in the number of bacterial cells on the surface of gold nanocoatings was 63% and occurred after 5 min and was 99% after 30 min of exposure to IRR (808 nm). The high antibacterial efficacy of a combination of gold nanocoatings and IRR can be explained by a higher density of radiation power, as well as a greater sensitivity of microorganisms to photothermal effects. 

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