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Preservative efficacy - pH dependent
Hi all,
Should I adjust pH of my batch before adding preservatives like sodium benzoate or potassium sorbate whose efficacy is higher at low pH?
If I add preservatives like these at high pH, (let’s say 8 or 9 as in a surfactant base) do they get deactivated ?
Thanks ! -
1 Reply
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The pH needs to be less than 5.5 in the finished formula for SB & PS to effectively preserve. However adding them at a higher pH is fine as long as the finished formula is adjusted to <5.5
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