Photoisomerization of 2-[3-(2-Thioxopyrrolidin-3-ylidene) methyl]-tryptophan, a Yellow Pigment in Salted Radish Roots
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概要
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The photostability of (E)-2-[3-(2-thioxopyrrolidin-3-ylidene)methyl]-tryptophan ((E)-TPMT), the main yellow pigment in salted radish, was studied. First we analyzed the photoproduct generated from (E)-TPMT under longwave UV irradiation. On the basis of NMR spectroscopy, the photoproduct was identified as Z-configurated TPMT, and isomerization from the Z- to the E-form was reversibly induced by Vis-light irradiation. The optimum wavelength for isomerization from the E- to the Z-form was 360–380 nm, and that for isomerization from the Z- to the E-form was 440–460 nm. The E/Z-ratios in the photostationary state under UV- and Vis-light irradiation conditions were approximately 0.95:1 and 26:1 respectively. The (Z)-isomer was more sensitive to light irradiation than the (E)-isomer in the quantum yield measurement. Yellowing was dependent on the ratio of the (Z)-isomer, because the b* and chroma value rose with increases in the (Z)-isomer by the colorimeters. Hence, it is possible that the formation of the (Z)-isomer contribute to the yellow color of takuan-zuke during long salting and fermentation.
- 社団法人 日本農芸化学会の論文
- 2008-09-23
著者
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MATSUOKA Hiroki
Department of Electronic Engineering, Tohoku University
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Matsuoka H
Department Of Health And Nutrition Takasaki University Of Health And Welfare
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YAMADA Yoichi
Faculty of Engineering, Yamaguchi University
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IIZUKA Takeshi
Department of Physics, Faculty of Science, Ehime University
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Yamada Y
Department Of Electrical And Electronic Engineering Yamaguchi University
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OZAWA Yoshio
Department of Health and Nutrition, Takasaki University of Health and Welfare
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UDA Yasushi
Department of Bioproductive Sciences, Utsunomiya University
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Uda Yasushi
Department Of Bioproductive Sciences Faculty Of Agriculture Utsunomiya University
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Uda Y
Niigata Coll. Niigata Jpn
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Uda Yasushi
Department Of Agricultural Chemistry Utsunomiya University
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Ozawa Yoshio
Department Of Health And Nutrition Takasaki University Of Health And Welfare
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Matsuoka Hiroki
Department Of Biochemistry And Molecular Biology Nippon Medical School
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TAKAHASHI Asaka
Nagano Prefectural College
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WATANABE Emi
Department of Health and Nutrition, Takasaki University of Health and Welfare
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Watanabe Emi
Department Of Health And Nutrition Takasaki University Of Health And Welfare
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Watanabe Emi
Department Of Applied Chemistry And Biotechnology Okayama Univ. Of Science
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Yamada Yoichi
Faculty Of Education Utsunomiya University
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Watanabe Takeaki
Department of Electronics, Faculty of Engineering, Nagoya University
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Iizuka Takeshi
Department Of Health And Nutrition Takasaki University Of Health And Welfare
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HONZAWA Shuji
Faculty of Educatisn, Utsunomiya University
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YOSHIKAWA Hiroko
Department of Health and Nutrition, Takasaki University of Health and Welfare
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Iizuka Takeshi
Department Of Chemistry Faculty Of Education Gunma University
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Honzawa Shuji
Faculty Of Educatisn Utsunomiya University
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Watanabe Takeaki
Department Of Health And Nutrition Takasaki University Of Health And Welfare
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Watanabe Takeaki
Department Of Electronics Faculty Of Engineering Nagoya University
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Yoshikawa Hiroko
Department Of Health And Nutrition Takasaki University Of Health And Welfare
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