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Background : In the course of type 2 diabetes mellitus, insulin resistance has a severe impact on endothelial function leading to decreased synthesis of nitric oxide (NO). Postprandial hyperglycemia leads to the generation of reactive oxygen species, which counteracts the beneficial NO effects. NO and superoxide combine very fast in solution to form peroxynitrite, which is a potent protein-oxidizing agent. The peroxynitrite concentrations can be indirectly monitored by the detection of nitrotyrosine residues in proteins, reflecting the extent of damage caused by oxidative stress.

clinical chemistry and laboratory medicine

Determination of nitrotyrosine concentrations in plasma samples of diabetes mellitus patients by four different immunoassays leads to contradictive results and disqualifies the majority of the tests