【摘要】 水产品、香菇等食品会产生内源甲醛,从食品安全的角度考虑,应该在其贮藏加工过程中尽可能去除。本文研究了茶多酚与甲醛的反应特性,探讨茶多酚作为甲醛捕获剂的可能性;研究了不同pH值、反应温度及反应时间对茶多酚-甲醛反应的影响;研究了儿茶素类单体及简单酚类物质与甲醛反应的特性。通过试验发现,pH对反应的影响最显著,温度次之,反应时间的影响最小;强酸及碱性条件下反应活性较高;较高反应温度条件下,延长反应时间,有利于茶多酚与甲醛的反应。儿茶素类化合物与甲醛的较强反应活性是由于它们的A环中存在间苯三酚型结构,而B环上羟基的数目基本不影响其与甲醛的反应活性。没食子酰基的存在使表儿茶素没食子酸酯、表没食子儿茶素没食子酸酯与甲醛的反应活性比儿茶素、表儿茶素、表没食子儿茶素的强。因此茶多酚是一种良好的甲醛捕获剂,对捕获食品中的甲醛有应用价值。更多还原

【Abstract】 Formaldehyde exists in aquatic products,Lentinula edodes and other foods. For better application of tea polyphenols as formaldehyde capture agent,the reaction of green tea polyphenol with formaldehyde was studied under various pH value,reaction temperature and reaction time,to further understand the reactivity of tea polyphenol with formaldehyde,the reaction of various kinds of simple phenolic compounds and green tea caechins was examined. The results suggested that pH was the most effect on reaction,followed by temperature and reaction time,the activity was the lowest at pH 3～4 and higher at strong acidic and alkaline conditions. Prolonging the time facilitated the reaction under the higher temperature and reaction time. Additionally,the factors for reactivity of green tea catechins with formaldehyde may be the presence of phloroglucinolic A-ring structure,and the hydroxyl number on the B-ring was hardly affect the reactivity. Especially,(-)-espicatechin gallate and(-)-epigallocatechin gallate,which have a galloyl moiety at the C-3 position, showed higher reactivity. So there is a great prospect with tea polyphneol as formaldehyde capture agent for foods.更多还原