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苹果汁变黑能喝吗
更新时间: 2020-09-14 00:00:00  

苹果汁变黑的原因:

榨出来的苹果汁容易变黑,是因为铁与空气发生氧化反应。

当苹果削皮后,植物细胞中的酚类物质便在酚酶的作用下,与空气中的氧化合,产生大量的醌类物质。新生的醌类物质能使植物细胞迅速的变成褐色,这种变化称为食物的酶促褐变。所以苹果汁放一会儿后会变色。

关键词: 果汁

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