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Gel turning yellow to brown
Hello - this is my first post to this forum. Obviously I need some help. I have looked through all the posts and could not find any answers.
I have made a gel (for the gums) and half of the product from the same batch discolored. I was suspecting the preservative to cause the problem, but I read that potassium sorbate may cause discoloration but not sodium benzoate. I am at a loss to understand why some discolored and no others.
Stability samples have not change colors.
Here is the formula
Mother
Aqueous Concentrate1.00% Purified water 82.65% Allantoin 0.50% Hydroxyethyl
Cellulose2.00% Xylitol 13% Peppermint oil 0.75% Sodium benzoate 0.10% 100.00% -
5 Replies
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if it’s inconsistent, that suggests contamination of some kind, or a packaging-related issue
what kind of packaging have you filled it into?
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It is indeed frustrating when stability tests don’t show the same change, one reason a stability test can’t be standardized. Check first what the difference may be. contamination/packaging as @Bill_Toge says (try to use same packaging for stability tests)- or any other factor that may differ. light situation- oxidation (of peppermint oil?) - production method . pH etc,.
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13% essential oil of peppermint? That is a really high amount. Really?
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Hi all - thanks for the answers.
We always do stability in the final packaging, which in this case is an airless bottle.
The peppermint oil is 0.75% not 13% - I did not know that it could oxidize.
Do you mean bacterial contamination? we tested a few sample, light and dark, they all came out clean.
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@homeobiz I meant contamination from the production line, or from the packaging itself, not necessarily microbial
what material is your bottle made from, where was it manufactured, and is it manufactured under sterile conditions?
also: what’s the pH of your product?
(sodium benzoate at 0.1% is only effective if your product is very acidic)
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