PMID: 11312885Apr 21, 2001Paper

Isolation and characterization of glyoxal-arginine modifications

Journal of Agricultural and Food Chemistry
M A Glomb, G Lang

Abstract

5-(4,5-Dihydroxy-2-imino-1-imidazolidinyl)norvaline (1) was identified as the only product of the early reaction of arginine with glyoxal, which was slowly degraded to N(5)-[[(carboxymethyl)amino](imino)methyl]ornithine (3, N(7)-carboxymethylarginine). No other structures could be detected within a range of pH 4-8 and 20-50 degrees C in reaction conditions. The rates of formation for both products increased with pH and temperature. In equilibrium, the vincinal diol groups of 1 were 86% trans configured. The formation of 1 was reversible, as could be shown by cis-trans isomerization of the separated isomers and by regeneration of arginine in the presence of the alpha-dicarbonyl trapping reagents, o-phenylenediamine and aminoguanidine. Both 1 and 3 were converted to 5-(2-imino-5-oxo-1-imidazolidinyl)norvaline (2) only under strong acidic conditions.

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