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New preservative question
There is a new preservative available to the DIYer called TRISTAT PC 90.
It is 90% phenoxyethanol & 10% capryly glycolCurrently I use the following in my skin creams for preservatives (plus hurdle ingredients like 6% propylene glycol):
0.3% Phenoxyethanol
0.5% Germall +Could I substitute the 0.3% TRISTAT for 0.3% Phenoxyethanol (PLUS the 0.5% Germall +) and expect the same level of preservation? NOTHING else would be different about the skin cream, just possibly using the Tristat preservative.
Thank you for any comments!
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13 Replies
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Margaret said:There is a new preservative available to the DIYer called TRISTAT PC 90.
It is 90% phenoxyethanol & 10% capryly glycolThis is new?
It was called Optiphen….forever. Nothing like dusting off a classic, and putting a new bow on it. (I guess that is what marketing is!).3% to .3%…would not be an identical match…due to the Optiphen being at a 90% ratio of phenoxy.
FYI….carbon chain length of PG…is pretty short… I will speculate… 2% of Pentylene glycol will do as good a job….and feel better.
The effectiveness increase with carbon chain length. -
Yes
No problem -
As Graillotion said, the “new preservative” is not novel - a marketing combination and nothing special. You need something for fungi.
Your current preservative is overkill. Drop the phenoxy entirely, Germall+ should ~3000 ppm. A chlelar (EDTA is appropriate).
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O.K. thanks all you fine people!
I had NOT realized this Tristat & Optiphen are different combinations of phenoxyethanol & capryly glycol.
I have been using the phenoxyethanol with the Germall + only the last 1 1/2 years approx. because it’s supposed to be slightly volatile from what I read on a real cosmetic chemist’s blog/web-site, so I figured I’d add that to the CREAM since fingers go into the product. I’m happy to read I can just go back to Germall + only. Woopee
!I use sodium phytate at 0.3%. Once that’s gone I’ll go back to the EDTA at 0.2%.
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Margaret said:O.K. thanks all you fine people!
I had NOT realized this Tristat & Optiphen are different combinations of phenoxyethanol & capryly glycol.
I have been using the phenoxyethanol with the Germall + only the last 1 1/2 years approx. because it’s supposed to be slightly volatile from what I read on a real cosmetic chemist’s blog/web-site, so I figured I’d add that to the CREAM since fingers go into the product.
I use sodium phytate at 0.3%. Once that’s gone I’ll go back to the EDTA at 0.2%.
….Not different combinations….the EXACT same combo.
I think you have read some terms…and mistaken some similar sounding terms.
What you want on the glycol…is ‘Pentylene’ glycol.
Pentylene Glycol (formulatorsampleshop.com)
What you want as the head space preservative….is: ‘Phenethyl’ alcohol, not Phenoxy!
Perfumers Apprentice - Phenyl Ethyl Alcohol
(Hehehehe….sure sounds like you were trying to follow my protocols…I have posted on other pages.
)And Yes….your current system was rather redundant, and did not achieve you desired effect. Switching to Phenyl Ethyl…will also be redundant, but will give you the desired ‘head space’ result you are looking for.
Aloha.
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@Margaret I would be remiss to not say…. Phenyl ethyl alcohol…has a pronounced ‘rose’ scent.
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Phenyl ethyl is not so good vs. Gram positives. For headspace - IF it volatilizes from your product at level - it might inhibit Gram neg’s and fungi.
https://microbeonline.com/phenylethyl-alcohol-agar-pea-principle-composition-and-preparation/
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PhilGeis said:Phenyl ethyl is not so good vs. Gram positives. For headspace - IF it volatilizes from your product at level - it might inhibit Gram neg’s and fungi.
https://microbeonline.com/phenylethyl-alcohol-agar-pea-principle-composition-and-preparation/
What do you think of O-Cymen-5-ol as strictly a head space preservative (add-on)…. I guess in comparison to PEA? @PhilGeis I always have a big pile of that on hand.
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O-Cymen-5-ol vapor pressure is a bit < PEA’s. Don’t know if either would be effective for headspace from cosmetic matrix
Are you sure you need headspace preservation? -
PhilGeis said:O-Cymen-5-ol vapor pressure is a bit < PEA’s. Don’t know if either would be effective for headspace from cosmetic matrix
Are you sure you need headspace preservation?I do have two products in jars that consumer touches….so…. Yes!
(Especially since I don’t use P’s and F’s.) -
@Graillotion
Consumer touches? Can you explain?
Have you seen contamination on inner package surfaces? -
PhilGeis said:@Graillotion
Consumer touches? Can you explain?
Have you seen contamination on inner package surfaces?Consumer extracts product with finger.
No…But I already use PEA in the product…and jump through all the preservation hoops…plus some extra ones.
Product below…. finger extraction of product.
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@Graillotion
I think you’re ok without an attempt at head space protection. Open pots have been around for around a century. My experience - we didn’t worry about growth on inner package surface.
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