I am working on a project where I am attempting to add pH adjusters to an anhydrous system. The idea is that although oil systems wont support pH adjustment, when applied topically the skin moisture will be adjusted to a final pH of 5-6 (tested as 1% in DI water). The issue I am facing is that there is 2% ZnO suspended in the oil system which will drive skin pH up.
Has anyone been able to solubilize in a pH adjuster (Citric, Lactic, Sal acid)?
I don't necessarily want to make an emulsion, but I might be heading in that direction.
The oil base is CCT, but I am open to changing the polarity of the base oil if it helps.
The other option I am open to is thickening the oil system and just suspending the acid powder.
This will be a shake before use product.
Any ideas to add a pH adjuster to an oil so that when added to water in a 1% solution the pH is 5-6?