Enzyme Inactivation by TiO2 Photosensitization with UVA
T. Hancock-Chen and J.C. Scaiano, “Enzyme Inactivation by TiO2 Photosensitization with UVA”, J. Photochem. Photobiol. B: Biol., 57(2-3), 193-196 (2000).
The enzyme horseradish peroxidase is extensively inactivated by UVA exposure in the presence of TiO2, a common ingredient of sunscreens and cosmetics. The effect is attributed to the generation of reactive oxygen species, as indicated by the inactivation enhancement observed in the presence of air.