title: Photochromic Properties of 3-Deoxyanthocyanidin Pigments in Nontoxic Solvents.
abstract: The photochromic properties of some naturally occurring 3-deoxyanthocyanidin pigments were investigated in various nontoxic solvents. When luteolinidin, a representative 3-deoxyanthocyanidin, was dissolved in a mixture of weakly acidic water and an organic solvent with a relative permittivity between 20 and 34, it was possible to repeatedly induce coloration via ultraviolet irradiation and decoloration under light-shielded conditions. 1,3-Butanediol and ethanol, which are approved for use in foods, cosmetics, and household goods, were found to be appropriate organic solvents for this process. In addition, we confirmed that other 3-deoxyanthocyanidins, specifically apigeninidin and tricetinidin, which are commonly found in food grains and tea leaves, also exhibit photochromic properties.
authors.affiliation: School of Bioscience and Biotechnology, Tokyo Univ. of Technology, 1404, Katakura-machi, Hachioji, Tokyo, 192-0982, Japan.
authors.forename: Yuki
authors.initials: Y
authors.lastname: Yagishita
authors.affiliation: School of Bioscience and Biotechnology, Tokyo Univ. of Technology, 1404, Katakura-machi, Hachioji, Tokyo, 192-0982, Japan.
authors.forename: Mai
authors.initials: M
authors.lastname: Mihara
authors.affiliation: Dept. of Materials Science and Chemical Engineering, Faculty of Engineering, Shizuoka Univ, 3-5-1, Johoku, Naka-ku, Hamamatsu, Shizuoka, 432-8561, Japan.
authors.forename: Yoshiumi
authors.initials: Y
authors.lastname: Kohno
authors.affiliation: School of Bioscience and Biotechnology, Tokyo Univ. of Technology, 1404, Katakura-machi, Hachioji, Tokyo, 192-0982, Japan.
authors.forename: Masashi
authors.initials: M
authors.lastname: Shibata
mesh_terms: D000872:Anthocyanins / Q000032:analysis*; D047310:Apigenin / Q000032:analysis; D002072:Butylene Glycols / Q000737:chemistry; D003116:Color; D000431:Ethanol / Q000737:chemistry; D005511:Food Handling; D005514:Food Irradiation; D010936:Plant Extracts / Q000032:analysis; D018515:Plant Leaves / Q000737:chemistry; D012997:Solvents / Q000737:chemistry; D013662:Tea / Q000737:chemistry; D014466:Ultraviolet Rays; D000067348:Whole Grains / Q000737:chemistry; D000094162:Phytoalexins
chemical_list: D000872:Anthocyanins; D047310:Apigenin; D002072:Butylene Glycols; D000431:Ethanol; D010936:Plant Extracts; D012997:Solvents; D013662:Tea; C028491:1,3-butylene glycol; C104027:apigeninidin; D000094162:Phytoalexins; C518537:luteolinidin
keywords: anthocyanin; cereal; color; photochromism; plant extract