PhilGeis
Forum Replies Created
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btw - NaOH and Mg sulfate will likely precipitate some Mg hydroxide
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Data I’ve seen is with anionic surfactants.
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I’m only aware of phenomenon with surfactant-based products
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the products were
here’s a poster for the benzoic acid/pH efficacy. There’s also an article SOFW about 5 years ago -
Nice post Mayday. I too have had trouble with sorbate and also had little to no issue with phenoxy odor (mine at 5000 ppm or less).
One add - benzoic acid with surfactants can have efficacy well above the indicated pH from pKa. Can send some documentation
I used this in preservation (with isothiazolinones) for surfactant products face wash, shampoo, hand soaps for many years. -
EDTA won’t work - tho’ a builder would be a good idea for cleaning. It’s just a booster to preservative efficacy. Your objective for household products is to make them clean - unlike cosmetics for which micro safety in use is an issue.
Can you heat (pasteurize) product as final manuf step? -
Dawn uses isothiazolinone and phenoxyethanol - with the apparent head fake that the latter is “solvent.”
Viscosity - would NaCl work ? Might be cheaper and less prone to soap formation with food fatty acids
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yes
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Suggest phenoxy max 5000 ppm. If that isn’t effective, greater level is unlikely to help.
Sorbate as unsaturated molecule can undergo oxidation. -
You’ll not form a soap per se - but dishwashing detergents are typically alkaline. Suggest adjustment to ~ 8-9 with NaOH. You might also consider a preservative. Look at Dawn https://dawn-dish.com/en-us/how-to/what-dawn-is-made-of-ingredients
Why mag sulfate? for viscosity adjustment? -
Could “smell” may also be due to sorbic acid instability/oxidation?
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Doubt much info - but product ingredients prob would be functional - sugars, amino acids, protein,
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what product?
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FDA does not “approve” specific sunscreens. They are made in compliance to the relevant monograph, drug GMPs, etc.
https://www.accessdata.fda.gov/drugsatfda_docs/omuf/OTCMonograph_M020-SunscreenDrugProductsforOTCHumanUse09242021.pdf -
Prob best to examine mineral sunscreen labels of major manufacturers.
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Glycols at higher conc’s can irritate. It is often transient, disappearing with continued product use as iwith relevant deodorants,
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What is surfactant?
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Agree with Paprik - water activity with making controls would prob work for self life tho 70% sucrose would leave potential fungal gap. - if preserved, suggest you shoot for that target. FA releasers and phenoxy not so useful in that context. what’s pH?
With packaging - what is expectation of consumer water addition/contamination/ -
Glycerine from Sapogel + 2% is prob irrelevant - great if you could get Aw data but I know that’s not generally available.
What’s powder bioburden?
Hot fill ? Does it appears to take up water? -
The quality of their product is not the quality of your product. Can you share your risk assessment?
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MurtazaHakim said:4% w/v of CHG is the active ingredient. A formulation with such a high % of CHG should not require any other preservative.
Wrong. Or perhaps you can prove it.
To note in your “proof” - https://www.cambridge.org/core/journals/infection-control-and-hospital-epidemiology/article/outbreak-of-burkholderia-cepacia-bacteremia-caused-by-contaminated-chlorhexidine-in-a-hemodialysis-unit/85154B587466D8DD5BFC9F9971CDF95E
https://academic.oup.com/jimb/article/42/6/905/5995474?login=true
and many other such reports in google scholar.
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Not only will phenoxyethanol not cover fungi and Gram positive bacteria well enough - if diluted 1:10 as you indicate, you’ll have only 600 ppm - and inadequate level in any case.
Will you have the consumer dilute?
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what is the preservative?
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CHG is a poor preservative.
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Not “purpose”. Those are not added.
Na Carbonate is a natural contaminant of NaOH - a product of CO2 from air and NaOH.
NaCl is a feedstock for NaOH production - prob left over from that process.