The presence of free glucose in serum was found to interfere with accurate measurement, by a colorimetric method, of nonenzymatically glycosylated serum proteins. A mean elevation to 241% of basal levels was observed in the serum of 11 nondiabetic subjects to which glucose, in a concentration of 300 mg/dl, had been added immediately before assay. After dialysis of serum samples to remove glucose, levels of nonenzymatically glycosylated serum proteins were 0.27 ± 0.11 and 0.79 ± 0.24 nmol 5-hydroxymethylfurfural/mg protein (mean ± SD), respectively, in 57 nondiabetic and 62 type I diabetic subjects. Levels observed before dialysis of serum were approximately two to three times higher. These studies indicate that removal of free sugar from serum is necessary for accurate measurement of glycosylated protein by thecolorimetric method, and this can be achieved by overnight dialysis of serum against normal saline.
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Rapid Publications| May 01 1980
Nonenzymatically Glycosylated Serum Protein: Spurious Elevation Due to Free Glucose in Serum
Allan Laurence Kennedy;
Homas D Mehl;
Address reprint requests to T. J. Merimee, Department of Medicine, Division of Endocrinology and Metabolism, University of Florida, Box J-226, JHM Health Center, Gainesville, Florida 32610.
Allan Laurence Kennedy, Homas D Mehl, Thomas J Merimee; Nonenzymatically Glycosylated Serum Protein: Spurious Elevation Due to Free Glucose in Serum. Diabetes 1 May 1980; 29 (5): 413–415. https://doi.org/10.2337/diab.29.5.413
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