[19p-E215-1~17] 4.5 Terahertz Photonics

▲ [19p-E215-15] The nondestructive evaluation of penetration of the cosmetic liquid into the pig skin

〇(M1)Sota Sueda¹, Taihei Kuroda¹, Kenji Sakai¹, Toshihiko Kiwa¹, Keiji Tsukada¹ (1.Okayama Univ.)

Keywords:Terahertz, cosmetic, Penetration

In the process of development of cosmetic liquids, it is required to evaluate a penetration depth and speed into the skin. A tape stripping method is conventionally used to evaluate penetration of the cosmetic liquids. However, the tape stripping method requires florescent dyes to measure the penetration depth. Also, the tape stripping method cannot evaluate the penetration speed because it is destructive evaluation method.
In our group, we applied a terahertz time-of-flight measurement (THz-TOF) method to evaluate the penetration depth and speed nondestructively. We have demonstrated the time evolution of penetration of cosmetic liquids using chicken skins.
In this study, we used Yucatan micropig skins for evaluation and effect of glycerin and ethanol concentration dependences on penetration speed was evaluated.