Evaluation of Foundations under the Influence of UVA Irradiation.

Nishimura Hirochika, Kamata Tsutomu, Takeda Yuko, Motoyoshi Katsuhiro

doi:10.5107/sccj.33.3_297

It was found that the foundation exposed to ultraviolet rays could accelerate the oxidization of squalene, a sebum component. This finding was based on the following experiment: 1) squalene and 2) squalene and foundation were applied individually on the human arm and exposed to sunlight for 1h. Then, the levels of oxidization of 1) and 2) were compared by the TBA method. The result of this experiment led us to the abovementioned finding. Thus the oxidization level of the squalene exposed to ultraviolet rays was examined with regard to each powder component of the foundation in order to determine the causative factors involved. As a result, titanium oxide was identified as one of the factors. Hence, the powder component which has the titanium oxide surface coated with silica was developed, thereby to make a prototype of foundation that will not allow the oxidization of squalene to be accelerated. The effect of this new foundation on the skin was compared with that of the conventional foundation using the back of a hairless mouse. The result verified that the newly developed foundation surpassed the conventional product in terms of mitigating the scale and induration in an epithelial change on hand, and inflammatory cell infiltration in a dermal change on the other hand. This suggests that inhibiting the accelerated oxidization cased by the foundation exposed to ultraviolet rays can help mitigate their adverse effect on the skin as well.

Evaluation of Foundations under the Influence of UVA Irradiation.

Bibliographic Information

Description

Journal

Citations (1)*help

Keywords

Details 詳細情報について

Export

Report a problem