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Will mix citric acid with CAPB neutralize it’s impurities like DMAPA and LAPDMA?
I purchase CAPB locally and it has very dark color so it may have a lot of impurities.
If i mix it with some citric acid before mixing it with other surfactants, will it neutralize impurities like DMAPA and LAPDMA etc?
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4 Replies
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Yes, and that’s the same recommendation (I believe from Colipa) to neutralize secundary amines and prevent nitrosamine formation. Now, I’d be more worried about the very dark color for other reasons as well. Did you run a microbial test?
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No i dont run the test.
They are either preserved with formalin or CMI MI.
What else coud be the reason?
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Also if i use cocamide methyl MEA as co surfactant for SLS: SLES instead of CAPB it feels milder and better scalp feel after hair is dried. I dont know if it is because of impurities in my CAPB or MEA reduces irritation of SLS: SLES more than CAPB .
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I still believe CAPB rules! Let me elaborate. The synergy you see when mixing amphoterics like CAPB with anionics such as SLES is mostly due to the quaternary amine present in CAPB (besides the hydrogen bonds from the amide group, of course), which is missing in CAM MEA. While CAM MEA could potentially have a positive charge in some conditions, that species is not very stable and it’ll prefer to have a neutral configuration. Because of that, CAPB is my dog (sorry about the slang!).
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