What ingredients are incompatible with sodium benzoate?
I read a blog post here (“The best cosmetic preservatives”)by @sromanowski.
It said organic acids and their salts, including sodium benzoate, may have a formulation incompatibility issue with “cationics, some proteins, nonionics.”
What are “cationics”? In cosmetics lingo, does cationics mean cationic surfactants only, or just in general, anything cationic?
For instance, if you mix sodium benzoate at a low pH with lysine, a positively charged amino acid, do you expect some kind of precipitation or non-covalent but ionic interactions that are expected to have practical meaning of any kind?
Is mixing cationic proteins in low pH with sodium benzoate expected to have benzoic acid interacting with said proteins, is that why it may be incompatible with “some proteins”?
If there are known examples of ingredients you know that are incompatible, I’d love to know to get a better sense.
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