Controlling Hydroxyl Radical Formulation in TiO2 Sunscreens

The use of titanium dioxide (TiO2) in cosmetics is extensive; in addition to makeup such as pressed powder cakes, liquid foundations, lipsticks and eye makeup, it is used in sunscreen creams. However, its rutile form for cosmetics may produce small amounts of hydroxyl radicals upon exposure to sunlight. Therefore, in the present article, the authors use salicylic acid (SA) as a hydroxyl radical capture agent to examine the development of free radicals in solutions or creams containing TiO2 to further examine its safety upon UV exposure.

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