Study on color formation of green tea liquor caused by complexation of pigments with the other components.

绿茶汤色因色素与其他成分络合而形成的研究。

• 批准号: 21700747
• 负责人: UJIHARA Tomomi
• 金额: $ 1.58万
• 依托单位: National Agricultural Research Organization
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21700747/
• 关键词: 食品; 緑茶水色; フラボノイド; 複合体形成; カテキン; 金属イオン

Copper, iron, and aluminium ions caused hyperchromic effect to monoglucosyl rutin aqueous solution. Catechins caused hypochromic effect to the solution, and the effect of gallate-type catechins was greater than that of non-gallate-type catechins. Catechins formed 1:1 complexes with the monoglucosyl rutin. Binding constants were larger in gallate-type catechins than in non-gallate-type catechins. These results suggest that the complexation between gallate-type catechins and monoglucosyl rutin are responsible for the color change of the monoglucosyl rutin solution. The color of the metal-monoglucosyl rutin mixture solution became paler by adding epigallocatechin gallate to the solution, nonetheless, the color was deeper than that of the monoglucosyl rutin solution added epigallocatechin gallate only.

铜、铁、铝离子对单葡萄糖基芦丁水溶液产生过色效应。儿茶素对溶液有显色作用，且没食子酸型儿茶素的作用大于非没食子酸型儿茶素。儿茶素与单葡萄糖基芦丁形成1:1的配合物。没食子酸型儿茶素的结合常数大于非没食子酸型儿茶素。这些结果表明，没食子酸型儿茶素与单葡萄糖苷芦丁的络合作用是导致单葡萄糖苷芦丁溶液颜色变化的原因。添加没食子儿茶素没食子酸酯后，金属-单葡萄糖苷混合溶液的颜色变浅，但比只添加没食子儿茶素没食子酸酯的单葡萄糖苷混合溶液的颜色更深。

项目成果

Hypochromic effect of an aqueous monoglucosyl rutin solution caused by green tea catechins

绿茶儿茶素引起的单葡萄糖芦丁水溶液的减色作用

• 发表时间: 2009
• 期刊: Bioscience, Biotechnology, and Biochemistry Vol.73, No.12
• 作者: Tomomi Ujihara;Nobuyuki Hayashi
• 通讯作者: Nobuyuki Hayashi