Fresh Apples

what substance keeps apples fresh


1) lemon juice

2) diet 7 up


the lemon apple would remain the same throughout the 2 days while 7 up apple rotted

what happened ?

turning brown

Apples turn brown when exposed to air because of the oxidation process that goes on when the inside of the apple gets exposed to the ambient air which contains oxygen and water molecules. The skin of the apple protects it form this process.
This oxidation process is very sensitive to the ambient temperature

lemon apple

Lemon juice, when applied to the fruit slows down oxidizing in two ways. First, lemon juice is abundant in vitamin C which is a natural antioxidant and reduces oxidation. Secondly, the citric acid in the juice reduces the pH value of the surface of the apple to a level where oxidation becomes difficult to occur.