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Dehydroacetic acid + propylene glycol
The preservative effect remain even if the preservative is at lower concentration if you also add propylene glycol.
The test results concluded that the bactericidal and fungicidal performance for propanediol was comparable to propylene glycol and better than butylene glycol.
Another example:
Excuse me for the grainy picture. I couldn’t find a better one.
https://www.cosmeticsandtoiletries.com/cosmetic-ingredients/preservation/article/21836193/boosting-preservative-efficacy-with-propanediol#figures-and-formulas________________________________________________________________
Does anyone know how this would work with dehydroacetic acid? (Geogard 221)
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3 Replies
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Zemea has some efficacy but don’t get carried away with marketing literature. Showing efficacy at 50% recommended level when they did not test at 100% is hardly compelling
To your question - doubtfully effective with just DHA. Geogard 221 includes DHA and benzyl alcohol.
Why would you titrate down to the just effective level? Cost savings are not that great and the test, tho’ better than USP 51, is still not validated. -
Thank you PhilGeis!
Do you think adding propylene glycol will enhance the preservative effect of Geogard 221?Adding propylene glycol to any formulation should make it less hospitable for any microbes I would assume?
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Yes, Zemea is a good addition. One major upscale cosmetic marketer routinely uses it in their systems.
The marketing literature is real stupid.
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