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變色的水果 水果為什么會變色

來源:鮮淘網 2018-07-20 15:10:50      水果之家小雪 手機版

  不知道有沒有果友在做水果拼盤時跟果果有一樣的煩惱,那就是剛擺上和切開的水果擺著擺著就開始變色了,水果為什么會變色呢?解決的方法又是什么呢?畢竟變色的水果擺著也不好看吶。

  變色的水果

  一、變色的水果(果皮變色)
變色的水果 水果為什么會變色

  大家都知道未成熟的水果有一個典型的特征,那就是未成熟的水果的果皮大多是青綠色的,但成熟過后,水果的果皮則會慢慢變紅或變黃,并在同時會散發出一陣清香,這是為什么呢?

  最初原因:水果在成熟之前果實會含有大量的葉綠素,這就導致了未成熟的水果為什么大多是青綠色的。

  變化過程:但水果中除了含有葉綠素以外還含有類胡蘿卜素(橙黃色),當水果中的葉綠素比類胡蘿卜素含量多時,它果皮的顏色就會因為葉綠素而呈現出一種青綠色。

  變化原因:等到水果慢慢成熟的時候葉綠素就會被逐漸破壞,水果中的類胡蘿卜素就會慢慢顯露出來將水果的果皮漸漸變成橙黃色,當然如果是花青素和番茄素的話,水果就會變成紫紅色或紅黃色。

  二、變色的水果(果肉變色)
變色的水果 水果為什么會變色

  生活中有一個有趣的現象果果不知道大家有沒有注意到,有些水果放著并不容易變色,但是只要切開,果肉就會迅速變黃,這又是為什么呢?

  這是因為果肉里含有氧化酶和一些酚類物質,而水果內的含有的酚類化合物在常溫的環境中經過催化和氧化會變成醌類化合物從而引起變色。

  但由于果皮中并不含有這些酶和酚類物質,于是被切開的水果會立即發生色變反應變成黃色,然后隨著反應的量的增加,果肉的顏色也會逐漸加深最后變成深褐色。除此之外,銅、鐵、鋅等元素有增強氧化酶活性的作用,因此刀具與果肉的接觸后也會加快變色。

  如何防止水果變色

  防止水果變色之前我們先來了解一下水果變色需要的幾個必要條件。首先是合適的氣溫、其次就是與氧氣接觸和有機酸的缺失。這三個必要條件中我們解決一條就可以有效的防止水果變色啦!

  1、合適的氣溫。
變色的水果 水果為什么會變色

  溫度合適的話果肉中的氧化酶就會開始劇烈反應導致水果快速變色,所以我們只需要將水果冰凍或是加熱就可以阻止酶繼續工作。

  2、與氧氣接觸。
變色的水果 水果為什么會變色

  對付氧氣這個就比較簡單啦,只要將果肉與氧氣隔絕開來,不讓氧氣與果肉接觸就可以啦,我們可以用保鮮膜將水果包裹住隔絕空氣,要注意的是,要將保鮮膜緊貼果肉,不要將空氣包在里面。還有一種方法就是將水果泡在水里阻止空氣接觸。

  3、有機酸的缺失。
變色的水果 水果為什么會變色

  水果中的有機酸的缺失導致水果發生變色,這時我們將有機酸涂在果肉表面就可以讓PH值下降,使酶不再繼續工作,這里我們使用的有機酸可以使檸檬汁或是橙汁,用水化開食用的維生素C也是可以起到作用的。

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