Shelf life of vitamin C solution in tap water?
I made a saturated ascorbic acid solution for use in dropper bottles. About 300ml in total. A few days ago, it turned yellow in a sealed jar. It was made two months ago in a container.
Now I'm wondering if the vitamin C has broken down into other products or if the non-demineralized water has caused some impurities and made the water stale?
Would boiling it help with any possible living organisms? I don't want to waste the vitamin C, even though it's very cheap.
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So my guess would be that ascorbic acid was oxidized. Dehydroascorbic acid thereby forms and is beige in solid form, which could cause this yellowish coloration in solution. This isn't so bad for the first time, the body can still do something.
This is the reason why ascorbic acid should not be stored as a solution. Because the aqueous solution in combination with the presence of acids and metal ions significantly accelerates this process, just as does temperature increase. So the whole thing is still promoting boiling.
If you cook vitamin C, it's broken. Two months are far too long, that is not stable in solution. Light and heat are particularly bad. Store it in klristallin shape and release it only when you need it.
Vitamin C solution is always fresh as it is not capable of storing. Not for months.