How should I determine a functional pH for a preservative that has a recommended pH range.
Hi everyone! I am having a discussion with my peers and it seems that we are in a bubble. We were discussing whether or not the pH range of a preservative depends on the initial water phase pH (in a O/W emulsion), the final water phase pH or both. We have been adjusting the water phase in order to fit the proper and recommended pH range to the preservative for most of our batches, however it came into discussion that it possibly is not necessary and that the pH mainly depends on the final pH of a O/W emulsion or both. I would like to hear you guys out on any information regarding to this.