Even when we buy orange juice that lists only “orange juice” as its ingredients, store bought OJ looks and tastes really different from OJ when I run a couple of oranges through the juicer. Store bought is more opaque and tends to just taste different from biting into an orange. Why?
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There is another problem that u/samx3i did not mention in their excellent post: one of the key aroma chemicals of orange, acetaldehyde, is *really* volatile (it evaporates fast), so it is impossible to retain in squeezed juice for very long.
Acetaldehyde is the stuff that stings your eyes when you peel an orange. Later, it gives the same “this is really fresh” feeling in your mouth.
Despite applying *a lot* of chemical wizardry, neither flavor nor juice companies have managed to reproduce the effect of, or preserve, this stuff in bottled juice.
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