Betaine: nf Betaines are zwitterionic compounds in which the atom carrying the positive charge does not carry a hydrogen atom and is not adjacent to the atom carrying the negative charge. Betaines do not admit limiting forms without charge. Historically, the term refers to quaternary ammoniums derived from amino acids. The name betaine comes from the sugar beet from which the first betaine discovered, trimethylglycine (TMG, historically called "betai ...
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