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Sodium benzoate vs benzoic acid efficacy
Is these any different between preservation efficacy of about %0.2 sodium benzoate or benzoic acid if used in combination with phenoxyethanol at the same pH?
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6 Replies
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Other than the lesser concentration of the ion due to the sodium salt, there is effectively no difference - assuming you obtain solution of addition. It’s a pH driven equilibrium.
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@PhilGeis sorry buy i didn’t get your point “assuming you obtain solution of addition”. Can you explain it a bit more!
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Once you bring benzoic acid or sodium benzoate into solution and adjust to a given pH, equimolar concentrations of the two will have a virtually identical antimicrobial effect.
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@Pharma got it thanks
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Benzoic acid solubility can be an issue. it’s much less soluble in water than the sodium benzoate. Other than that, there is no difference.
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@PhilGeis thanks