dimethyl ether. Among ultrafine emulsions made by these methods, it was reported that an o/w type emulsion, which had been prepared with POE/POP dimethyl ether, sterol surfactant, and polar oils, was characterized by a lamellar structure on the outside of nano-size emulsified particles (lamellar nanocapsules). The investigation of the use of various kinds of lipophilic active ingredients inside the particles showed that the particles could hold the ingredients stably. The fluidity of emulsified particles was also investigated from the measurements of fluorescent polarization and NMR measurements. On the other hand, panel tests of a cosmetic essence containing the emulsion showed that approximately 80% of panelists confirmed the essence could improve their skin condition including skin-moisture and skin-tension after the treatments, and they felt a clear progress in skin-improvement by continuing use of the essence.In order to reveal the role of disulfide (S-S) bonds in the fine structure of human hair fibers, especially in the complex between intermediate filaments (IFs) and intermediate filament-associated proteins (IFAP), we investigated the relationship between melting behavior of (-crystallites on thermal analysis and structural orientation of the fibers when S-S bonds were oxidized using 1.5 wt% peracetic acid (PAA) solution. It was revealed that oxidative treatment of human hair fibers immersed in PAA solution made cystine residues dissociate to cysteic acids and that the (-crystalline structure of the oxidized hair fibers was maintained despite the fission of S-S bonds. Their thermographs in water on high pressure differential scanning calorimetry (HPD-SC) showed that the endothermic peak assigned as the melting of (-crystallites became separated into two endothermic peaks with progression of the treatment time, and the one started melting at a lower temperature while the other had a higher melting temperature than the melting temperature of untreated hair. Furthermore, the sum of the two endothermic peak areas decreased. Polarized light microscopic observation indicated that the orientation of IFAP still existed at the temperature at which the orientation of IFs disappeared. Therefore, these results suggested that some S-S linkages at the interface between IFs and IFAP dissociated with the PAA treatment and that there was not only some region of IFs stabilized by S-S bonds but also another region of IFs stabilized by hydrophobic interaction for their thermostability.The correlation between tactile sensation and tactile movement during application of cosmetics is important because tactile sensation is induced only by active handling. The aim of this study is to evaluate application feeling of skin care products objectively using motion analysis of human fingers during application. The effect of the application velocity on the sensory evaluation score was investigated. It was shown that the participants tend to apply the skin care products at the velocity which they feel the most comfortable. Based on this ...
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