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为什么炒熟的鸡蛋放了一天会变黑
更新时间: 2020-07-03 00:00:00  

原因:鸡蛋暴露在空气中过长时间,已经被氧化。

解释:鸡蛋中含有蛋黄,而蛋黄中有很多蛋白质,蛋白质含有较多的蛋氨酸,经过长时间加热并置于空气中过长时间,蛋氨酸能分解出硫化物,它与蛋黄中铁发生反应,在蛋黄的周围形成绿色或灰绿色的硫化铁,导致鸡蛋颜色逐渐变深。

关键词: 为什么 鸡蛋

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