I made this formulation for a stability study we were conducting on some raw material but the outcome was so amazing I couldn't help share it with you.
This is by no means a KISS emulsion but the procedure is still rather straightforward. This emulsifier makes emulsions with a silky texture and outstanding stability, is easy to work with and very forgiving in terms of shear and temperature.
We made two versions of the emulsion. The one at the right side contains no starch. The left one contains 5% of our modified rice starch. It increases the viscosity, improves the stability and imparts a powdery skin feel. Feel free to make any of them you want.
Procedure:
The procedure is exactly the same for both formulations.
1- Heat phase A and B separately at 80-83 C.
2- Blend both phases separately then stop heating and homogenize the oil phase in the water phase
3- Disperse the gum in the still hot emulsion
4- Start cooling down while stirring
5- At a temperature <40 C add phase D and E. The preservative we are using works independent of the pH. If you are using other preservatives you need to measure and adjust the pH before adding the preservative
6- When the emulsion is at RT prepare a 10% dilution and measure the pH. In our case it was 6,5.
7- Add lactic acid to reduce the pH between 4,8-5,5. Since this formulation is buffered you may need more acid than usual. Add the acid gradually and little by little and measure the pH in between
8- Take your stability and micro kit samples and fill the rest in a suitable jar
You may find these files helpful in your emulsion making process and stability testing
