Influence of Hydration for Optical Properties of Stratum Corneum.

概要

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Transparent skin is demanded as the ideal skin condition by the majority of women. Therefore to analyze its characters in scientific aspects is an important study for the development of cosmetics. The recognition survey for skin transparency withdrew that water holding into stratum corneum was a critical parameter. Therefore, to clarify whether the skin transparency referred by women is related to the transmittance of stratum corneum or the water contents, the relationship between the transmittance of stratum corneum and water contents were examined by using the peeled human stratum corneum in vivo. The adequate hydrations in the stratum corneum (until 38% H2O per SC weight) exhibited gradually to increase the transmission, however, excess hydration conversely decreased. Furthermore, women who had a higher value of water contents or claimed higher transparency themselves showed to increase the reflection on skin surface under excess hydrated conditions. From these findings, it was speculated that the skin transparency claimed by women was caused by the transmittance of the stratum corneum. In this study, we proposed one possible factor for the skin transparency.
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