Antibacterial and Biofilm-Preventive Photocatalytic Activity and Mechanisms on P/F-Modified TiO 2 Coatings
Photocatalytic antibacterial and biofilm-preventive activity in liquid of heavy-metal-free coatings based on a phosphorus (P)- and fluorine (F)-modified TiO photocatalyst has been investigated. They reveal significantly higher immediate and longer-term (biofilm-preventive) inactivation capacity than...
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Published in | ACS applied bio materials Vol. 3; no. 9; pp. 5687 - 5698 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
United States
ACS Publications
21.09.2020
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Subjects | |
Online Access | Get full text |
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Summary: | Photocatalytic antibacterial and biofilm-preventive activity in liquid of heavy-metal-free coatings based on a phosphorus (P)- and fluorine (F)-modified TiO
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 TiO
P25 on three bacterial species differing in cell wall type and ability to resist oxidative stress (
,
,
) (up to more than 99% reduction of colonization on P/F-modified TiO
coating compared to about 50% on P25 TiO
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 (ROS) diffusion to the outer membrane of the targeted adhered bacteria. Decrease in ROS-related impairment of cell wall, respiratory, and enzymatic activities confirms the loss of ROS throughout the bacterial cell degradation.
and
are less sensitive than
, 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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ISSN: | 2576-6422 2576-6422 |
DOI: | 10.1021/acsabm.0c00467 |