Singlet oxygen generation in the presence of titanium dioxide materials used as sunscreens in suntan lotions
Singlet oxygen generation in the presence of titanium dioxide materials used as sunscreens in suntan lotions
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DOI：
10.1016/j.jphotochem.2010.05.019
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发表时间：
2010-06-25
影响因子：
4.3
通讯作者：
Macyk, Wojciech
中科院分区：
文献类型：
--
作者：
Buchalska, Marta;Kras, Gabriela;Macyk, Wojciech
本研究的目的是测试市售防晒霜及其组分（主要是TiO 2）的光反应性。分离的含有二氧化钛的水不溶性组分在4-氯苯酚降解试验中表现出几乎无活性，然而在这些材料存在下观察到UV光诱导的天青B的快速降解和α-萜品烯氧化成蛔虫醇。将防晒乳液及其组分的光反应性与非那烯酮（一种有效的O-1（2）光敏剂）的光反应性进行了比较。结果已经证明羟基自由基形成的效率相对较低，然而，在化妆品组分或原样使用的防晒乳液的存在下观察到涉及单线态氧的显著反应速率。此外，由隔离的TiO 2材料制成的光电极的有效光电流产生反映了它们的光氧化还原性质。尽管在防晒霜中用作添加剂的单线态氧清除剂可能会降低与产生这种活性氧有关的风险，但含有二氧化钛的化妆品生产商应考虑测试TiO 2的光活性，以参考O-1（2）的产生。(C)2010 Elsevier B. V.保留所有权利。
The goal of this study was to test photoreactivity of commercially available suntan lotions and their components (mainly TiO2). 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 alpha-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 O-1(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 TiO2 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 TiO2 photoactivity in reference to O-1(2) generation. (C) 2010 Elsevier B.V. All rights reserved.