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土豆丝放久了会变成什么颜色

更新时间: 2020-09-18 00:00:00     

土豆中含有一种多元酚类的单宁物质,又称为鞣质。单宁在酶的作用下,极易被空气氧化而生成褐色,称为酶褐变。为了避免单宁物质遇空气氧化,应将切好的土豆、藕放在清水或淡盐水中泡,使之与空气隔绝,就不会变色了。

关键词: 土豆 变成 什么 颜色

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