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Article Dans Une Revue ACS Applied Bio Materials Année : 2020

Antibacterial and Biofilm-Preventive Photocatalytic Activity and Mechanisms on P/F-Modified TiO 2 Coatings

Résumé

Photocatalytic antibacterial and biofilm-preventive activity in liquid of heavy-metal-free coatings based on a phosphorus (P) and fluorine (F)-modified TiO2 photocatalyst has been investigated. They reveal significantly higher immediate and longer-term (biofilm-preventive) inactivation capacity than a reference coating made of the commercial photocatalyst TiO2 P25 on three bacterial species differing in cell wall type and ability to resist oxidative stress (Escherichia coli, Staphylococcus epidermidis, Pseudomonas fluorescens) (up to more than 99% reduction of colonization on P/F-modified TiO2 coating compared to about 50% on P25 TiO2 coating for 10 min UV-A illumination). This results from the P-and F-induced improvement of photocatalyst properties and from the smoother surface topography, which shortens reactive oxygen species (ROSs) diffusion to the outer membrane of the targeted adhered bacteria. Decrease in ROSsrelated impairment of cell wall, respiratory and enzymatic activities confirms the loss of ROSs throughout the bacterial cell degradation. Staphylococcus epidermidis and Pseudomonas fluorescens are less sensitive than Escherichia coli, with a probable relation to the bacterial oxygen stress defense mechanism. The coating antibacterial efficacy was highly affected by phosphate ions and the richness in dissolved oxygen of the reaction medium.
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hal-03031805 , version 1 (30-11-2020)

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Yige Yan, Charline Soraru, Valérie Keller, Nicolas Keller, Lydie Ploux. Antibacterial and Biofilm-Preventive Photocatalytic Activity and Mechanisms on P/F-Modified TiO 2 Coatings. ACS Applied Bio Materials, 2020, 3 (9), pp.5687-5698. ⟨10.1021/acsabm.0c00467⟩. ⟨hal-03031805⟩
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