cho_chang
Registered: 03/15/06
Posts: 9
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Reply with quote | #1 |
I have been trying to minimize alcohol in my 2% salicylic acid solution (my most recent formulation was 30% alcohol and 10% PG).
Has anyone tried this (aloe-based BHA)?
And also, I was thinking of still using 10% PG (to boost solubility) and 10% alcohol (as a preservative and to boost solubility; I don't mind a *little* bit of alcohol), should I add these to the aloe before heating? After? Is there anything bad about heating either of these ingredients?
So more or less a two-part question....
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hannah
Moderator
Registered: 08/22/05
Posts: 10,073
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Reply with quote | #2 |
We avoid propylene glycol (it is used only as a solvent for the preservatives at a extremely small concentration) and alcohol.
Aloe vera is mostly water and will not dissolve salicylic acid. But if you start heating up stuff chemicals will decompose and you will end up with a mystery mix. Heating will not alter the solubility of a chemical, once the temperature goes back to ambient temperature, the chemical will re-precipitate.
Please be careful where you get your information. The internet is full of rubbish. Go for university linked websites or Mayo clinic. For chemistry, unless you know the subject (major in college), avoid it.
We sell an alpha/beta exfoliator that does not contain alcohol. it is excellent. Unless you can improve on it, you will not find anything better.
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cho_chang
Registered: 03/15/06
Posts: 9
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Reply with quote | #3 |
If you avoid alcohol and propylene glycol, what else could I possibly use to formulate a leave-on salicylic acid? it's pretty much only soluble in alcohols and glycols, besides surfactants
Also, can I ask why PG is avoided? I assume the alcohol is avoided because of irritation?
I would like to add that SkinBiology Exfol BHA serum is also aloe-based, so there must be *some* way to formulate BHA with an aloe base. I believe aloe also contains some derivatives of salicylic acid, like aspirin, so that could be why it's marginally soluble.
Edited for contents. We don't allow mention of websites not associated with universities. We don't like to promote websites that are not scientifically-based.
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hannah
Moderator
Registered: 08/22/05
Posts: 10,073
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Reply with quote | #4 |
You can buy our alpha/beta in bulk. Our prices are very low for the quality of ingredients and technology that goes into them.
Aloe is mostly water, as are all plants (and humans and animals). The product you are referring to contains some other solvents besides water, aloe vera and propylene glycol.
Sorry but there is no way around the physical properties of a chemical. They are what they are.
Propylene glycol is O.K. at low concentrations.
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