Abstract
Cis-trans isomers of N-methylacetamide were observed by using 13C nuclear magnetic resonance spectroscopy. The addition of neutral salts altered the isomer ratio favoring the cis form. The salt-induced cis isomerization is reversible and depends on salt concentration. Methylglyoxal added to N-methylacetamide formed a stable cis isomer. It is proposed that concentrated salts and methylglyoxal, by binding to the peptide bond, affect the properties of proteins.
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