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The necessity of buffering Geogard Ultra
Hi, I’m a formulation newbie. I am wondering if it’s really necessary to buffer Geogard ultra considering end product pH is at 5.5, so if the pH drift downward, there would be enough room to still be in a skin friendly pH range right? (considering other ingredients are compatible with pH range 4-6)
On another note, if I need to buffer Geogard Ultra, can I buffer it in the pure water phase(let’s say I’m making a lotion), then re-adjust again after product is finished? Will heat affect the buffered solution?
Thank you!
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16 Replies
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I guess I’d be far more concerned with how will you preserve the product…vs messing around with drifting pH from Geogard U.
How do you propose to pick up Gram negatives?
Use a proper chelate…and a proper preservative….issue solved. 🙂
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Thank you for the reply, for the full preservative system I use 1% Geogard Ultra, 0.2% Potassium sorbate, and 0.1% Sodium Gluconate. This should be enough?
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Prob not enough. At right pH, sorbate may not be needed but drop the gluconate.
As graillotion said - you need something for Gram negative bacteria - your greatest risk. Perhaps try phenoxyethanol.
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Thank you for the suggestion, I checked my supplier, I am able to get Phenoxyethanol + Caprylyl Glycol or Phenoxyethanol & Ethylhexylglycerin. Which one do you recommend?
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Go with the EHG combo. Tends to be slightly less disruptive to the emulsion than the CG version.
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thank you, noted 🙂
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btw, what’s your reason for dropping gluconate? If I use a strong preservative like phenoxyethanol, I don’t need a chelating agent?
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Gluconate is a poor chelator, and you have gluconolactone that hydrolyzes to gluconic acid/gluconate. For a chealtor use EDTA, GLDA, phytic acid, etc..
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You need the chelate….just a good one.
EDTA is of course king…but sometimes the granola folk don’t like it cus of biodegradable rate. Hence GLDA is your next best choice.
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ok, noted. However I can’t seem to find GLDA anywhere in my area. Is phytic acid my next best bet?
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Where is your area? The beginner sites tend to sell it under the wrong name. Here are some USA links:
TSGD (Tetrasodium Glutamate Diacetate) | MakingCosmetics
makingcosmetics.com
TSGD (Tetrasodium Glutamate Diacetate) | MakingCosmetics
Tetrasodium Glutamate Diacetate, GLDA chelate
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I’m from Australia, I’ve googled it and searched quite a few australian suppliers, they don’t have this one unfortunately.
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Here is another. If you are not in the US….then search under some of the synonyms.
Tetrasodium Glutamate Diacetate – Essential Labs
essentiallabs.com
Tetrasodium Glutamate Diacetate – Essential Labs
Tetrasodium Glutamate Diacetate is a multi-purpose, clear, liquid chelating agent and preservative booster. Tetrasodium Glutamate Diacetate is made from plant material, readily biodegradable, with high solubility over a wide pH range. Tetrasodium Glutamate Diacetate serves the same function in formulations … Continue reading
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I guess i’m on the “Natural” preservative hype train, I would prefer to use COSMOS or ecocert approved preservatives that are odorless. I know a lot of the Natural preservatives are not actually natural, but when I plan to market the product, at least I can say it’s COSMOS approved to be used in natural skincare.
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I would say… NO preservatives are natural. Find me ONE…that is not synthesized in a lab. The ones that are sold to the gullible as natural….simply paid a bribe…to have their lab synthesized chemical….certified as ‘natural’. ????
You probably won’t find too many on this site…that will sing “Kum ba yah” with you for all those agencies with their hand out….and with ZERO focus on safety. This group tends to tick with what is safe (you know….science) …not what some group (often lacking knowledge or common sense) chose as their ethos.
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I agree with you on that one, safety first.
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