What preservative are you using … you only list preservative? Depending on the composition, the preservative may be the culprit in the reduction of viscosity.
(1) Add the SA directly to your oil phase. As mentioned by @ngarayeva001 it is oil soluble, so you don’t need the premix you are preparing. Note: why are you using both Sodium Phytate and NaOH … you only need one base to raise the pH. Unless you’re using Sodium Phytate as a chelating agent?
(2) Prepare the emulsion without the addition of the preservative. If the emulsion will not form or breaks, then you know that you need to choose a different emulsifier that works with SA. If the emulsion does form, but thins or breaks when you add the preservative, then you need to choose a different preservative.
Hi, the preservative I’m using is benzoic acid, sorbic acid.
(1) Yes, sodium phytate is as chelating agent. Will try the method by putting SA in oil
(2) I have done the base (without EO, extract and SA) before, using the same preservative, it’s stable, thus is not preservative issue. Might be SA with the emulsifier.
Thank you for the advice.