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Anonymous
Anonymous asks:
Q:

why does uncovered orange juice hold vitamin c longer than covered orange juice? When orange juice (vit. c) oxidizes what exactly does that mean?

In Topics: Science fair
> 60 days ago

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Expert

greenprof2
Apr 8, 2011
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What the Expert Says:

Part 1 of your question, no idea - I'd predict the opposite. Part 2, oxidation is simply the process of combining oxygen with other atoms in a substance. O2 easily combines with carbon to form CO and CO2, which is what happens when something like wood burns.

Vitamin C is "the fragile vitamin" because it is sensitive to oxidation. When the juice is exposed to air, the vitamin C it contains degrades. Orange juice stays fresh a day or two if its kept chilled to slow the oxidation rate.

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