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莴笋为什么会变红

更新时间: 2020-09-22 00:00:00     

莴笋削皮后暴露在空气中,其中的多酚类物质和氧发生反应产生邻醌,再进一步氧化聚合而成褐色素和黑色素变成红色。由于氧气入侵,会失去原有的颜色。可以采用以下方法,使蔬果保持原色。浸水法,把削皮后易变色的蔬果浸在冷水里,使其与空气中的氧隔绝,它们就不会变色。加酸法,酚氧化酶在PH值为6到7时活性最强,PH值小于3时,活性会降低。因此,在食品中加酸醋降低PH值,可以抑制酶的活性,减慢变色速度。

关键词: 莴笋 为什么

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