Singlet oxygen generation in the presence of titanium dioxide materials used as sunscreens in suntan lotions

The goal of this study was to test photoreactivity of commercially available suntan lotions and their components (mainly TiO 2). Isolated water insoluble components containing titanium dioxide appeared almost non-active in the tests of 4-chlorophenol degradation, however a fast UV-light induced degr...

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Bibliographic Details
Published in:	Journal of photochemistry and photobiology. A, Chemistry. Vol. 213; no. 2; pp. 158 - 163
Main Authors:	Buchalska, Marta, Kras, Gabriela, Oszajca, Marcin, Łasocha, Wiesław, Macyk, Wojciech
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 25-06-2010
Subjects:	Photosensitizer Reactive oxygen species Singlet oxygen Suntan lotion Titanium dioxide Reactive oxygen species Singlet oxygen Titanium dioxide Photosensitizer Suntan lotion
Online Access:	Get full text
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Summary:	The goal of this study was to test photoreactivity of commercially available suntan lotions and their components (mainly TiO 2). Isolated water insoluble components containing titanium dioxide appeared almost non-active in the tests of 4-chlorophenol degradation, however a fast UV-light induced degradation of azur B and oxidation of α-terpinene to ascaridol in the presence of these materials was observed. The photoreactivity of suntan lotions and their components was compared to the photoactivity of phenalenone (an efficient 1O 2 photosensitizer). The results have proven a relatively low efficiency of hydroxyl radicals formation, however significant rates of reactions involving singlet oxygen were observed in the presence of either the components of the cosmetics or the suntan lotions used as received. Moreover, an efficient photocurrent generation by photoelectrodes made of isolated TiO 2 materials reflects their photoredox properties. Although singlet oxygen scavengers used as additives in suntan lotions might decrease the risk related to generation of this reactive oxygen species, producers of cosmetics containing titanium dioxide should consider testing TiO 2 photoactivity in reference to 1O 2 generation.
ISSN:	1010-6030 1873-2666
DOI:	10.1016/j.jphotochem.2010.05.019