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The bactericidal effect of TiO2 photocatalysis involves adsorption onto catalyst and the loss of membrane integrity
Open accessAbstract
The bactericidal effect of photocatalysis with TiO2 is well recognized, although its mode of action is still poorly characterized. It may involve oxidation, as illuminated TiO2 generates reactive oxygen species. Here we analyze the bactericidal effect of illuminated TiO2 in NaCl-KCl or sodium phosphate solutions. We found that adsorption of bacteria on the catalyst occurred immediately in NaCl-KCl solution, whereas it was delayed in the sodium phosphate solution. We also show that the rate of adsorption of cells onto TiO2 is positively correlated with its bactericidal effect. Importantly, adsorption was consistently associated with a reduction or loss of bacterial membrane integrity, as revealed by flow cytometry. Our work suggests that adsorption of cells onto aggregated TiO2, followed by loss of membrane integrity, is key to the bactericidal effect of photocatalysis.
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Cites
Photocatalysis on TiO2 Surfaces: Principles, Mechanisms, and Selected Results
Linsebigler, A. L., Lu, G., & Yates, J. T. (1995) · Chemical Reviews · doi:10.1021/cr00035a013 · Cited by 11,575
Nieuwenhuijsen, M. J., Toledano, M. B., Eaton, N. E., Fawell, J., & Elliott, P. (2000) · Occupational and Environmental Medicine · doi:10.1136/oem.57.2.73 · Cited by 591
Cited by
Recent developments in photocatalytic water treatment technology: A review
Chong, M. N., Jin, B., Chow, C. W. K., & Saint, C. (2010) · Water Research · doi:10.1016/j.watres.2010.02.039 · Cited by 5,386
Decontamination and disinfection of water by solar photocatalysis: Recent overview and trends
Malato, S., Fernández-Ibáñez, P., Maldonado, M. I., Blanco, J., & Gernjak, W. (2009) · Catalysis Today · doi:10.1016/j.cattod.2009.06.018 · Cited by 3,004
Corinaldesi, C., Marcellini, F., Nepote, E., Damiani, E., & Danovaro, R. (2018) · Science of The Total Environment · doi:10.1016/j.scitotenv.2018.05.108 · Cited by 163
Gogniat, G., & Dukan, S. (2007) · Applied and Environmental Microbiology · doi:10.1128/aem.01079-07 · Cited by 140
Self-citationXu, J., Campbell, J. M., Zhang, N., Hickey, W. J., & Sahai, N. (2012) · Astrobiology · doi:10.1089/ast.2011.0776 · Cited by 31
Metadata
- Authors
- Gogniat, G., Thyssen, M., Denis, M., Pulgarin, C., & Dukan, S.
- Venue
- FEMS Microbiology Letters
- Publisher
- Oxford University Press (OUP)
- Published
- 2006-05
- Volume
- 258
- Issue
- 1
- Pages
- 18-24
- ISSN
- 0378-1097 (ISSN-L)
- 1574-6968
- OpenAlex
- W1867547547
- Cited by
- 269
- References
- 2
- FWCI
- 6.65
- Type
- journal article
- Language
- en
- Open access
- bronze
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- Gogniat, G., Thyssen, M., Denis, M., Pulgarin, C., & Dukan, S. (2006). The bactericidal effect of TiO2 photocatalysis involves adsorption onto catalyst and the loss of membrane integrity. FEMS Microbiology Letters. https://doi.org/10.1111/j.1574-6968.2006.00190.x
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