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Benzoic acid vs sorbic acid vs dehydroacetic acid vs salicylic acid antifungal
What percentage of sorbic acid or dehydroacetic acid or salicylic acid in their acid form will have the same antifungal effect as 1500ppm benzoic acid in acid form when combined with phenoxyethanol and EDTA?
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6 Replies
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Why? A pH limitation?
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I just wanted to know which preservative is stronger and how much difference is in strength.
There isn’t any pH limitation. The question about these preservatives is in acid form. For example sodium benzoate 0.3% at pH 4.18 and 1% at pH 4.95, both will have 1500ppm in acid form so what amount of sorbic acid or dehydroacetic acid in their acid form will have the same amount of power?
1500ppm or less in acid form?
As they have different pka, different amount of these will have 1500ppm in acid form at those ph. That is why i asked about the acid form, not actual amount.
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I’d not get too carried away with pKa - your formula may impact. Suggest 2500-3000 Na benzoate at favorable pH. Do not think sorbate/DHA buys anything more and brings in more question of stability.
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Got it. <div>
Thanks
So sodium benzoate is the best option among these three.
And what type of stability problem sorbate/DHA have?
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for example - https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1467-2494.1988.tb00582.x
and
https://pubs.acs.org/doi/pdf/10.1021/jf60232a072
Nothing is perfect - suggest use what works well in as many preservative applications as possible
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Thanks a lot
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