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Applied and Environmental Microbiology, December 2007, p. 7740-7743, Vol. 73, No. 23
0099-2240/07/$08.00+0     doi:10.1128/AEM.01079-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

TiO2 Photocatalysis Causes DNA Damage via Fenton Reaction-Generated Hydroxyl Radicals during the Recovery Period{triangledown}

Gaëtan Gogniat and Sam Dukan*

Laboratoire de Chimie Bactérienne, UPR 9043, Université de la Méditerranée, CNRS, 31 Chemin Joseph Aiguier, 13402 Marseille Cedex 20, France

Received 15 May 2007/ Accepted 1 October 2007

Here, we show that resistance of Escherichia coli to TiO2 photocatalysis involves defenses against reactive oxygen species. Results support the idea that TiO2 photocatalysis generates damage which later becomes deleterious during recovery. We found this to be partly due to DNA attack via hydroxyl radicals generated by the Fenton reaction during recovery.

* Corresponding author. Mailing address: Laboratoire de Chimie Bactérienne, UPR 9043, CNRS, 31 Chemin Joseph Aiguier, 13402 Marseille Cedex 20, France. Phone: 33-(0)491 164 459. Fax: 33-(0)491 718 914. E-mail: sdukan{at}ibsm.cnrs-mrs.fr

{triangledown} Published ahead of print on 12 October 2007.

Applied and Environmental Microbiology, December 2007, p. 7740-7743, Vol. 73, No. 23
0099-2240/07/$08.00+0     doi:10.1128/AEM.01079-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.





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