Chemical oxidation and DNA damage catalysed by inorganic sunscreen ingredients

Chemical oxidation and DNA damage catalysed by inorganic sunscreen ingredients
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DOI:
10.1016/s0014-5793(97)01356-2
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发表时间:
1997-11-24
期刊:
影响因子:
3.5
通讯作者:
Knowland, J
Knowland, J
中科院分区:
生物学3区
文献类型:
--
作者:
Dunford, R;Salinaro, A;Knowland, J

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二氧化钛 (TiO2) 已被认为是一种安全的物理防晒霜(美国联邦公报,43FR38206,1978 年 8 月 25 日),因为它可以反射和散射阳光中的 UVB 和 UVA。然而,TiO2 吸收约 70% 的入射紫外线,在水性环境中,这会导致羟基自由基的产生,从而引发氧化。使用化学方法,我们表明所有测试的防晒霜 TiO2 样品都能催化代表性有机底物(苯酚)的光氧化。我们还表明,阳光照射的 TiO2 在体外和人体细胞中都会催化 DNA 损伤。这些结果可能与防晒霜的整体效果有关。 (C) 1997 年欧洲生化学会联合会。
Titanium dioxide (TiO2) has been noted (US Federal Register, 43FR38206, 25 August 1978) to be a safe physical sunscreen because it reflects and scatters UVB and UVA in sunlight. However, TiO2 absorbs about 70% of incident UV, and in aqueous environments this leads to the generation of hydroxyl radicals which can initiate oxidations, Using chemical methods, we show that all sunscreen TiO2 samples tested catalyse the photo-oxidation of a representative organic substrate (phenol), We also show that sunlight-illuminated TiO2 catalyses DNA damage both in vitro and in human cells, These results may be relevant to the overall effects of sunscreens. (C) 1997 Federation of European Biochemical Societies.