Photostability enhancement of anionic natural dye by intercalation into hydrotalcite

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:337

Article

Kohno, Yoshiumi¹  Totsuka, Koichi¹  Ikoma, Shuji²  Yoda, Keiko³  Shibata, Masashi^3,4  Matsushima, Ryoka¹  Tomita, Yasumasa¹  Maeda, Yasuhisa¹  Kobayashi, Kenkichiro¹ 

[1] Shizuoka Univ, Fac Engn, Dept Mat Sci & Chem Engn, Naka Ku, Shizuoka 4328561, Japan

[2] Shizuoka Univ, Fac Engn, Div Engn & Appl Sci, Naka Ku, Shizuoka 4328561, Japan

[3] Kao Corp, Beauty Res Ctr, Sumida Ku, Tokyo 1318501, Japan

[4] Tokyo Univ Technol, Sch Biosci & Biotechnol, Tokyo 1920982, Japan

关键词: Anionic natural dye;    Hydrotalcite;    Layered double hydroxide;    Photostability;    Stabilization;    Intercalation;   

DOI  :  10.1016/j.jcis.2009.04.065

来源: Elsevier

【 摘 要 】

The aim of this study is the improvement of the photostability of several natural anionic dyes, carmine (CM), carthamus yellow (CY), and annatto dye (ANA), by complexation with hydrotalcite. The composite of the dyes and hydrotalcite is prepared by the coprecipitation method. CM is successfully intercalated in the hydrotalcite layer when the amount of introduced CM is large. The photostability of CM in CM/HT composites is superior to the CM adsorbed on silica surface. The effect of the stability enhancement is larger when the amount of introduced CM exceeds 0.23 g/g-host, or when the layer charge density of the hydrotalcite is larger. CY is also stabilized by complexation with hydrotalcite, whereas ANA is not stabilized by complexation with hydrotalcite. The photostability of an anionic natural dye can be improved by intercalation into the hydrotalcite layer, if the dye has a hydrophilic nature and a rather planar structure. The intercalated dye is stabilized by the protection from the attack of the atmospheric oxygen. In addition, contribution of the electrostatic interaction between the positively charged hydrotalcite layer and the intercalated anionic dye is also proposed. (C) 2009 Elsevier Inc. All rights reserved.

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