Why do potatoes turn brown once they are peeled?



  1. 0 Votes

    Potatoes contain an enzyme called polyphenol oxidase or tyrosinase that reacts with oxygen and iron-containing phenols that are also found in the potatoe.  So the exposure to the air creates an oxidation reaction, which  forms a sort of rust on the surface of the fruit. You see the browning when the potatoe is cut because the cells are damaged, allowing oxygen in the air to react with the enzyme and other chemicals.

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