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
中科院分区:
文献类型:
--
作者:
Dunford, R;Salinaro, A;Knowland, J
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.