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combining preservatives
Hi, looking for some advice on combining preservatives…
I have some hydrosols and aloe vera juice that already contain sodium benzoate and potassium sorbate (@1%). I want to eventually use these ingredients in various products, including a face scrub formula that requires a ph of 6.2-6.7, but I want to use more effective/ph appropriate preservatives.
The face scrub formula suggested the use of either:
phenoxyethanol/ethelhexylglycerin;
naticide, or;
preservative eco/geogard ect.
Could I combine one of these with the SB PS? If so, should the usage level be modified?
There’s probably no simple answer, but if anyone has any advice/suggestions, that would be much appreciated!
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10 Replies
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Twos simple answer - (1) forget the silly Naticide and 2) speak of specific chemicals - not commercial products.
Phenoxy/EHG with Benzoate at a lower pH and EDTA should work. Add sorbic if you use that combination.
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I have the same question, but one specific problem:
In an aloe gel with sepimax zen for cosmetic purposes, how much Na Benzoate and K Sorbate should I use?
I have the powdered form of each salt, so can I make a concentrated solution in distilled water and store that at room temperature to use within, say, two months?
Thanks for the help!
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I wouldn’t unless you can confirm stability. Benzoate should be stable, not so sure the sorbate, and ironically you may need a preservative for the preservative solution.
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Hello @PhilGeis ,
My supplier sells a liquid preservative, comprising of: aqua 55%, sodium benzoate 30%, potassium sorbate 15%; pH is 8.8-9.8.
Coming from a “natural” school, and after reading ALL comments/posts on this forum on preservatives, I might become a bit paranoid, but I feel like I want to understand everything: does your comment above applies to this combination as well? Or this combination is stable and can/does act as a preservative?
Thank you, indeed.
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Sure wonder at the stability - sorbate can be oxidized in water solution usually give a yellowish tint.
I’d sure ask the supplier for stability data.
https://pubs.acs.org/doi/abs/10.1021/jf60232a072
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@PhilGeis Thank you, very much. I will check the colour and ask the supplier as you suggested. Now I’m going to read the article. Wishing you a good week🙂
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Ouch! I guess a stock solution isn’t an option.
But what about the ratio? I’ve read that the usage for the combination of Na Benzoate and K Sorbate is 0.5% - 1.5%, but how much of which should be used at pH 5.5? Does 0.3% each of raw powder work?
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Use 2500 ppm of each
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Thank you so much!
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Sure!
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This reply was modified 3 weeks, 4 days ago by PhilGeis.
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This reply was modified 3 weeks, 4 days ago by
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