Abstract
Opaque physical sunscreens, ie, those containing TiO2 (titanium dioxide) or ZnO (zinc oxide) are important for photoprotection in UVA range. However, little is known about relationship different shapes or sphere size and UVA protection efficacy. Therefore, we studied the UVA protective properties of TiO2 and ZnO with different shapes.Absorption spectrum of dipersed materials showed that zinc oxides have a definite absorption peak at the range between 300 and 400nm, with the intensity observed in the order of flake>needle>bead in their shapes.In proportion to spectral characteristics, Zinc oxides exhibited a high UVA protective capacity as measured by guinea pig PUVA method with a similar order of shapes in their intensity.UVA protection capacity with flake zinc oxide for human skin revealed a dose-dependent increase which was well correlated with relative transmission at the UVArange when applied to epidermal sheet.Flake zinc oxide also showed the most suitable balance for having higher UVA protective capacity and lower whity effect.
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