Stability of a cream with an organic acid
In the past I posted a discussion about an issue I had with a fizzy emulsion. I was noticed that combining an organic acid (Glyoxylic Acid) with a cationic emulsifier basically causes a bath bomb. With that in mind, I replaced the cationic emulsifier with Lonzest MSA (Glyceryl Stearate and PEG-100 Stearate) and since then everything was good for a short period of time.
later on, I adjusted the product by combining different types of hair conditioning agents including PQ-10 (0.5%), Quaternium 91(1-3%), Behentrimonium Chloride (1-3%), Cetyl Esters (1-3%), Stearamidopropyl Dimethylamine (0.2-1%), and more natural oils. Also, the formulation contains EDTA 0.2% and BHT 0.3%. The Acid value is 35-40% (solution).
**The formulation doesn’t contain Cetyl or Stearyl Alcohol**
After some time, we can see a separation, and some of the samples became a bit fizzy. Important to mention that those samples were stored in a cool place during the period. In addition, the samples was releasing air when opening the cap.
Is there anything we are doing wrong with this formulation? Perhaps our stability system is not suitable with this Acid combination?
your professional opinions would be greatly appreciated.