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Chelator question
In a shampoo formula, sodium gluconate is called for but I don’t have any. Would I be able to use tetrasodium glutamate diacetate instead? Or is there another chelating agent you recommend?
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14 Replies
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Gluconate isn’t much of a chelator - use NaEDTA
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Yeah, tetrasodium glutamate diacetate is a good chelator. And @MarkBroussard uses it. Typical usage rate is 0.2 to 0.3%.
But as mentioned by Phil, NaEDTA’s are good option too.
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@Paprik does terrasodium glutamate diacetate have any incompatibilities with other ingredients that you know of?
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You should be perfectly fine using GLDA to replace Sodium Gluconate.
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what is your pH?
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@PhilGeis I didn’t take the pH of my water phase. If it’s too low will that affect the solubility of the Disodium edta?
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Good morning @francisa
Does your disodium edta dissolve in water? Have you tried dissolving it before the other ingredients? -
It will take a little while to go in but it will. Are you using more than 0.10%?
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@KimberlyLars yes I am using more than .10%
could that be the issue? -
@Adamnfineman I have not tried dissolving it in water first. Good idea.
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EDTA becomes increasingly less soluble at low pH (and vice versa); GLDA’s solubility is less pH sensitive. However, you use it at a low concentration and the main issue you’ll see is the slow speed at which they dissolve (you’re unlikely hitting solubility limits). To speed up dissolution, use a smaller amount of water with a higher pH to make a concentrated stock solution. Some shampoo ingredients come at high pH, maybe use these to dissolve the chelates (especially if you make products for your personal use) 😉 .BTW EDTA is often more effective (stronger binding at lower pH) whilst GLDA is better for nature in several regards. -
Pharma said:EDTA becomes increasingly less soluble at low pH (and vice versa); GLDA’s solubility is less pH sensitive. However, you use it at a low concentration and the main issue you’ll see is the slow speed at which they dissolve (you’re unlikely hitting solubility limits). To speed up dissolution, use a smaller amount of water with a higher pH to make a concentrated stock solution.GLDA sold by the USA re-packers is almost always coming in a liquid solution, so for the small timers…GLDA…is NO SWEAT.
TSGD (Tetrasodium Glutamate Diacetate) | MakingCosmetics
Tetrasodium Glutamate Diacetate - Buy Bulk | Essential Wholesale
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@Pharma thank you so much for such a thorough answer. I think I’m going to try using the GLDA.
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