タンニンと共存物質との相互作用の効果(第8報)天然色素の変色防止効果
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概要
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The discoloration of shikonin (1) and β-carotene (2), occurring during storage of their ethanol solutions in the presence of oxygen in an illuminated room, was remarkably suppressed by hydrolyzable tannins, such as geraniin (4) and tannic acid JP (3) in the solution. The inhibitory effect of tannins was enhanced by the coexistance of metalic ion. The irradiation with ultraviolet lamp (254 and 365 nm) gave, at the first stage of the discoloration, two products, one of which was found to be 5,8-dihydroxy-2-(1-hydroxy-3-oxo-4-methyl-4-pentenyl)-1,4-naphthoquinone (7). The presence of hydrolyzable tannins induced higher accumulation of these two products in the solution, showing that the secondary structural transformations of these two products were strongly inhibited by these coexisting tannins. These results suggest that tannins could be efficient inhibitors of discoloration of natural pigments.
- 社団法人日本薬学会の論文
- 1995-03-25
著者
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吉田 隆志
Department Of Pharmacognosy College Of Pharmaceutical Sciences Matsuyama University
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吉田 隆志
岡山大学薬学部
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奥田 拓男
岡山大学薬学部生薬学教室
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奥村 智子
Faculty Of Pharmaceutical Sciences Okayama University
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奥田 拓男
Takeda Chemical Ind. Ltd. Osaka Jpn
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周 〓
岡山大学薬学部
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毛利 和子
岡山大学薬学部
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奥田 拓男
岡山大学薬学部
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毛利 和子
Faculty Of Pharmaceutical Sciences Okayama University
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