If a piece of apple is left out long enough, it may spoil. Watch this time-lapse video to see what happens to two apple halves when they are left out in a room for six days. Unless it is specially prepared, a desiccated piece of apple is not nearly as appealing as a plump, juicy piece of apple. The skin of the apple helps keep liquid inside of the apple, but when the apple is cut open, its skin can no longer protect it, and it slowly loses water. Desiccation is the process by which something loses water and dries up. These chemicals are what make the cut apple turn brown over time.Īs a piece of apple turns brown, you may have noticed that it can also shrivel up a little, or desiccate. These interactions cause many other interactions, which eventually lead to the forming of brown-colored chemicals. In the case of the apple, when it is cut, oxygen can interact with certain proteins, called enzymes, in the flesh of the apple. The apple may have changed in appearance it may have turned brown, shriveled up a little, felt and smelled different, and no longer been tasty.Īpples turn brown because of a chemical process called oxidation, which happens when oxygen interacts with another substance. Ever cut an apple into pieces and let some pieces sit out for a while? After a few hours, you may have found that the apple was less appealing than when you first ate it.
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