Effect of Reactive Species Photogenerated by the Ultraviolet Irradiation of TiO₂ on the Peroxidation of Linoleic Acid

Abstract

This article shows that hydroxyl radicals adsorbed on the surface of TiO₂ (Ti-^•OH groups) account for about 70–100% of the photocatalytic peroxidation of linoleic acid under UVB irradiation, which results into malondialdehyde production. The experimental data are silent concerning the involvement of ¹O₂ in the process, although an upper limit of 30% can be hypothesized, while an involvement of surface-bound holes into the lipoperoxidation process can be excluded.

Keywords:

• Aeroxide P 25
• linoleic acid peroxidation
• MDA
• TiO₂ nanoparticles
• UVB irradiation

Acknowledgments

The research has been carried out with the financial support of Regione Piemonte (Project CIPE 2006) project “Nanoparticles: From Their Impact on the Environment and Human Health to Safer Production and Usage (Nanosafe).”