Home Cosmetic Science Talk Formulating Adding Acids to anhydrous systems

  • Adding Acids to anhydrous systems

    Posted by HonestChemist on February 14, 2020 at 4:01 pm

    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?

    Sponge replied 4 years ago 3 Members · 2 Replies
  • 2 Replies
  • chemicalmatt

    February 14, 2020 at 4:23 pm

    No need to solubilize if its solid state. Just suspend with silica in the CCT.

  • Sponge

    February 17, 2020 at 5:35 pm

    This seems like an incredible amount of liability to assume. 

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