Apples contain a lot of fiber and sturdy cellulose material that make them hardy and resistant to spoiling quickly. In addition, they have thick skins that prevent them from drying out and are also often coated in a waxy, water-soluble substance that acts as a further barrier against moisture loss. Properly stored, apples can remain good to eat for a weeks, depending on how fresh they were when you bought them. “The best way to keep them is to place them in a Ziploc bag, squeeze out all the air and keep in the fridge,” says Kantha Shelke. By removing their oxygen supply, you are arresting respiration, and slowing down enzymatic activity and spoilage. Another reason to keep apples in a bag and separate from other fruits is that they produce a fair amount of ethylene which encourages ripening.
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