著者

渋江 ゆう子 小山内 宰 武内 栄次郎 岩井 秀隆 峰松 義博

出版者

The Society of Cosmetic Chemists of Japan

雑誌

日本化粧品技術者会誌 (ISSN:03875253)

巻号頁・発行日

vol.26, no.2, pp.120-130, 1992-10-30 (Released:2010-08-06)

参考文献数

10

被引用文献数

2 1

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To evaluate skin color and skin tone exactly, we developed a new instrument, Skin Tone Analyzer (STA), which applys an image-processing system on the polarized images of skin.The insertion of two polarized filters into the CCD camera in STA made the observation of clear images without interference from the diffuse reflections originating on the surface of the skin. The 20 times magnified images of the skin surface (1×1cm) are resolved into 400×400 points and transfered to a digital computer. To measure the color difference value, calculate the L, a and b values of each point from their respective R, G and B values, using conversion equations determined from the measurement of two hundred pieces of standard color papers with the STA and general spectrophotometric colorimeter (CMS-1200). Then, the color differences determined by STA are indicated as average values of L, a and b values for a finite set of points. Further, their standard deviation values (s. d.) which may represent the degree of skin tone (irregularity in the lavel of skin color) are obtained. In fact, we found that the s. d. of b values (s. d. b) among the three components, L, a and b, reflects appropriately the degree of skin tone caused by delocalization of melanin. Thus we now propose that the s. d. b is a good parameter for the evaluation of skin tone. Moreover, a designated part of images can be analyzed and STA will be a useful tool for the study of pigmentation spots.Based on the above assumption, we examined the effect of seasons and aging on the skin color and skin tone of the cheek (exposed skin) and the inside of the upper arm (non-exposed skin) in healthy Japanese females (N=62, 19-75y) with STA. From the analyses of skin tone during periodical measurements, the degree of skin tone in the cheek was found to be worse than the arm's. The former becoming worse owing to aging, but the later exhibiting no change. Also the degree of skin tone in the cheek in October (after the summer) was worse than in February (in the winter). In addition, L and b values for the cheek also increased owing to aging, but these values for the arm did not so change.It is known that daily exposure to ultraviolet rays (UV) can influence colory skin. We now also confirm that UV promotes a change for the worse in the skin tone. Next, we propose to study the effects of UV on localized pigmentation using STA.

著者

矢作 和行 岩井 秀隆

出版者

Japan Oil Chemists' Society

雑誌

日本油化学会誌 = Journal of Japan Oil Chemists' Society (ISSN:13418327)

巻号頁・発行日

vol.45, no.10, pp.1133-1143, 1996-10

被引用文献数

1 3

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香粧品における界面活性剤は洗浄用途とスキンケア用途に大別される。シャンプーにおける界面活性剤の応用はマイルドな界面活性剤の開発とコンディショニング効果の付与が大きな流れになっている。更にどの素材を組み合わせるかによって大きく性能が異なることから配合組成が重要となる。リンスではカチオン性界面活性剤が毛髪に吸着残留してはじめて機能を発揮することから,機能開発の指針も毛髪への吸着残留性並びに毛髪表面物性をいかに変化させるかという視点で応用開発が進んでいる。スキンケア化粧料では高機能化が求められ,様々な有効成分を安定に分散させるための界面活性剤の選択が重要になってきた。さらにリポソームや液晶のように生体類似の高次構造体からなる新しい製剤の開発も行われている。