The Maillard reaction of model compounds for peptide-bound lysine (4-aminobutyric acid, 6- aminocaproic acid, Na-acetyl-L-lysine) with reducing sugars (D-ribose, D-xylose, D- arabinose, D-glucose, D-fructose, D-glyceraldehyde) was investigated under both stringent and mild conditions. With pentoses the corresponding w-(dimethylma1eimido) carboxylic acids 1-3 were identified as substantial, hitherto unknown components by GC/MS and ...