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Oxidation is cause by (obviously) the oxygen in the air. When you cut up fruit for instance, the parts without skin which are exposed will turn brown quickly. Squeezing lemon juice over your fruit (apple, pear, banana, ect) will stop oxidation because the juice contains Vitamin C (ascorbic acid). The ascorbic acid reacts with the oxygen preventing the browning on the apple (fruit). In theory, other citric fruits would do the same thing.

Whenever making an apple pie (or pear whatever) squeeze a lemon over the pieces as you cut them up (and toss) this will stop the oxidation process while you are cutting up all the fruit.

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16y ago

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Squeezing lemon juice on fruit to prevent browning is not a chemical reaction, but rather a physical reaction. The citric acid in the lemon juice slows down the oxidation process that causes the fruit to turn brown by acting as an antioxidant.


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Limes turn brown due to a process called oxidation, where the enzymes in the fruit react with oxygen in the air. To prevent limes from turning brown, you can store them in a sealed container in the refrigerator, wrap them in plastic wrap, or sprinkle them with lemon juice to help slow down the oxidation process.


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