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Potassium Sorbate Yellowing in Wet Wipe
Hello,
Can anyone recommend a remediation for Potassium Sorbate yellowing in a 98% Water wet wipe?
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18 Replies
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Change preservative system.
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Hi Phil,
Thanks for the response. This project is for a “clean” phenoxyethanol-free baby wipe and I am currently using sodium benzoate and potassium sorbate as the preservative system. Would you have a recommendation for this system replacement?
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I understand. What is pH? “Clean” in context of baby is a risky proposition. what is your challenge test?
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I appreciate your willingness to help.
I fully concur that “clean” is a very subjective word and fleeting. The current pH is 4.5-5 in order to accommodate the current preservative system (sodium benzoate + potassium sorbate). This pH would be able to be adjusted but I would not like to go above 6 as this would not be beneficial for use on a baby’s skin and its own pH.
-intended PET: USP 51 and PCPC M5
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Apologies, the current preservative system is sodium benzoate + potassium sorbate + Ethylhexylglycerin
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Suggest 1%GEOGUARD ULTRA
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No!
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Have you tried it?
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Quite famliar with the components - an organic acid and a weak chelator stabilized with gluconic acid. You don’t even know the pH and your offering that silly combination that, under the best conditions, has nothing for Gram negative bacteria.
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not true Have passed many Otc challenge tests which include gram negative organisms.K sorbate is known to yellow at low PH as it exists as sorbic aid-eventualy goes dark brown-poor choice
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Bull - must be aware of the pH dynamics of benzoate and the development of wipe preservative systems. A known weak system on its face - just benzoate - passing equally weak USP 51, prob with juice, as an excuse to market - is a profoundly flawed approach to wipes preservation.
Pity your consumers.
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the proof is in the pudding-show me your data!!!!
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The proof is in the consumers hands. Show me your in-use data - it is your claim and responsibility. And please not just USP 51 of the juice.
Please understand, USP 51 is borrowed from pharma and has no validition for cosmetics - passing does not mean it’s effective in plants and more importantly in the hands of consumers - the actual purpose of preservation. Inexperienced folks take it as gospel - and such folks typically consider testing the juice qualifies the wipe product. The big variable is the substrate that operates as a chromatographic medium. Esp. for tub fill, the preservative will be in the top wipes and not the others.
Proper testing uses the finshed wipes - top and bottom of tub fill.
Benzoic acid is not effective against pseudomonads at any pH. Are you aware of the pH dynmaic for orgnaic acids? That it passes as juice - even with complete kill means little to the world of pseudomonads. The ATCC isolate used in USP 51 is a lab creature - isolated ~60 years ago from a lesion and it carries no resistant plasmids.
Using that crap preservaitve systemn for a baby wipe is a terrible idea.
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Yes, USP 51 is designed to pass…and give your insurance rep the ‘warm fuzzies’. ????
So Dr Geis, @PhilGeis , that was a question that was mulling around in the cotton I have for brains. Do I understand correctly, the USP 51, and the current slate….has no antibiotic resistant Gram - currently? Has there been any talk about adding or replacing a current member, with one of these more tough to kill, bad guys?
Aloha
Did I ever show you this pic…from the Volcano course? ????
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Great Picture!
Yup - the CTFA (PCPC) cosmetic industry methods. https://blog.microbiologics.com/preservative-testing-choice-of-challenge-isolates/
blog.microbiologics.com
Preservative Testing - Choice of Challenge Isolates - Microbiologics Blog
“What you see is that the most outstanding feature of life’s history is a constant domination by bacteria.” – Stephen J. Gould. Preservation capacity is a central element of consumer product quality. Though necessary to any microbiological risk assessment, adequate … Continue reading
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https://access.personalcarecouncil.org/Shop/Publications/Product-Details?productid={77D37D7B-711E-ED11-B83E-0022482235A6}
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I appreciate everyone’s weigh-in and am open to implementing a new preservative system under the potential pH range of 4.5-6. Ideally this preservative system would be as “clean as possible” and phenoxyethanol-free.
(PET would be USP 51 but I do not find that challenge test robust enough with true substantiation, especially when it comes to high aqueous content in conjunction with the product being a saturated non-woven).
Having said that, it is extremely frustrating trying to find an efficacious and broad-spectrum preservative system that is considered to be “clean” by the consumer , while being robust enough to pass the PCPC criteria. I am hoping to gain at least one of the following:
1) Find an ingredient/s that can reduce or eliminate the potassium sorbate yellowing given the parameter that the target pH range is 4.5-5.5
2) If Sodium benzoate + potassium sorbate is not a sufficient preservative system on its own, what additional “clean” preservative system or ingredient should be added? (pH 4.5-5.5)
3) A “clean” preservative system replacement for the SBPS with a broadening of the pH range to 4.5-6.
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M5 - excellent!!!
86 the sorbate; hold pH and benzoate; consider phenylethyl (note rose odor), diols (pentylene , octane); a little ethanol 4% can help, need a chelator (EDTA, GLDA , worry at stability for gluconolactone), no unknown mixtures (Leucidal, EO’s and extracts).
Product - what surfactants (some effectively increase benzoate pKa); tub/sachet fill or online conversion? any heat in process? package open to consumer in use or single sheet pull out?
Good luck - appreciate your prefessionalism.
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