Abstract
Objectives Carbonylation of the protein amino, guanidino and thiol groups is one of the important causes of vascular complications in diabetes. We developed a simple spectrophotometric method for monitoring of the changes in the protein amino group contents during carbonylation. Design and methods The method is based on the reaction of amino group with p-benzoquinone in the slightly alkaline media. It was applied during carbonylation in vitro with methylglyoxal and in vivo in 13 patients with type 2 diabetes and 20 healthy persons. Results The method is simple, fast, precise (RSD in the range of 1.2–1.8%) and accurate (recovery about 100%). The content of amino groups in human serum albumin isolated from diabetics was significantly lower (p < 0.01) in comparison with a control group. Conclusion The method developed is suitable for quantification of protein amino groups during in vitro carbonylation as well as for clinical practice.
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