Why does the banana peel in the refrigerator turn black?
30 years old
2018-04-29
I bought a banana a few days ago and forgot to eat it in the refrigerator. Today, I took it out to see it turned black. Why does the banana peel in the refrigerator turn black?
1 Answer These messages are for reference only
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BY Penelope Judson 2018-04-29The banana peel in the refrigerator will also turn black, because the polyphenylene oxidase in the peel polymerizes the phenols naturally present in the banana peel into polyphenols, which is a kind of melanin similar to human skin substance. In addition, when the cell membrane of the banana peel is damaged, dopamine is released. Under the action of oxidase, this substance will react with oxygen in the air to produce a brown substance. As a result, the banana becomes dark and soft and unbearable. The surface of cucumbers placed in the refrigerator is also prone to some water stains, which is also because the low temperature affects the function of the cell membrane as a "city wall", which eventually causes cell necrosis.7
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