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Food Spoilage
Apples
Storage of Fruits and Vegetables

Why do apples turn brown?

Answer

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Wiki User
October 17, 2011 7:20PM

Fruits such as apples and pears will rot if exposed to certain fungi. These fungi are relatively weak but can attack damaged or overly ripened fruit. When fruits such as apples ripen, they give off a gas called ethylene. Ethylene gas accelerates the ripening process, which will lead to over ripening.

The easiest way to prevent browning is to put the sliced apples in water. You can also squeeze like lemon juice on and helps it keep from browning. Most of the time apples brown when cut them. Apples can turn brown even when they are not cut though, but it takes considerably longer to brown.

Basically because the apple contains Iron. The iron inside the apple rusts when it comes in contact with air and that's why it turns to that brownish color.