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01-10 

蝦頭變黑是不新鮮嗎如何判斷蝦的新鮮度

蝦是很多人都喜歡吃，但蝦在保存過(guò)程中蝦頭是會(huì )變黑的。蝦頭變黑是不新鮮嗎？?　　要弄明白蝦頭為什么會(huì )變黑，大家需要先認識一種物質(zhì)——酪氨酸酶，它普遍存在于動(dòng)植物體內，雖然不同生物體內的酪氨酸酶結構差異很大，但基本功能是相似的。酪氨酸在酪氨酸酶的作用下，可以逐步形成醌類(lèi)物質(zhì)，然后再形成優(yōu)黑素、褐黑素等黑色物質(zhì)。蝦的全身都有酪氨酸酶分布，但頭

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