Photocatalytic inactivation of influenza virus by titanium dioxide thin film
- 14 May 2012
- journal article
- research article
- Published by Springer Science and Business Media LLC in Photochemical & Photobiological Sciences
- Vol. 11 (8), 1293-1298
- https://doi.org/10.1039/c2pp05414k
Abstract
Titanium dioxide (TiO2) under ultraviolet (UV) light produces a strong oxidative effect and may therefore be used as a photocatalytic disinfectant. Although many studies on the photocatalytic inactivation of bacteria have been reported, few studies have addressed virus inactivation. In the present study, we demonstrated the inactivation of influenza virus through TiO2 photocatalysis using TiO2 nanoparticles immobilized on a glass plate. The influences of the UV intensity, UV irradiation time and bovine serum albumin (BSA) concentration in the viral suspensions on the inactivation kinetics were investigated. Additionally, we also determined whether the International Organization for Standardization (ISO) methodology for the evaluation of antibacterial activity of TiO2 photocatalysis could be applied to the evaluation of antiviral activity. The viral titers were dramatically reduced by the photocatalytic reaction. Even with a low intensity of UV-A (0.01 mW cm−2), a viral reduction of approximately 4-log10 was observed within a short irradiation time. The viral inactivation kinetics were associated with the exposure time, the UV intensity and the BSA concentration in virus suspensions. These results show that TiO2 photocatalysis could be used to inactivate the influenza virus. Furthermore, a minor modification of the ISO test method for anti-bacterial effects of TiO2 photocatalysis could be useful for the evaluation of antiviral activity.Keywords
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