Antibacterial activity of thin-film photocatalysts

10 Okt 2008
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Photoinduced bactericidal activity of nanostructured titania based films and the effect of deposition of silver and bimetallic nanoparticles on the pathophysiological properties of titania films were investigated by the E.V. Skorb and co-authors. The antimicrobic activity of the films was assessed against gram-negative and gram-positive bacteria. It was shown that the silver-modified titania film demonstrates the highest photobiocide efficiency, enhancing the bactericidal activity of UV light ca. 71-fold, that results from radical improvement of microorganism adsorption and suppression of recombination of photoproduced charge carriers. Moreover authors by comparative analysis of morphologies of the cell envelops of gram-negative and gram-positive microorganisms and the resistance of their outer membranes make analysis to their sensitivity due to different reactive oxygen species generated by photocatalytic reactions.
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