5-hydroxymethylfurfural has been researched along with Diabetes-Mellitus* in 6 studies
1 trial(s) available for 5-hydroxymethylfurfural and Diabetes-Mellitus
5 other study(ies) available for 5-hydroxymethylfurfural and Diabetes-Mellitus
| Article | Year |
|---|---|
Nonenzymatic glycation of immunoglobulins leads to an impairment of immunoreactivity.
Incubation of purified human and rabbit immunoglobulin G with glucose leads to covalent incorporation of the sugar into the protein, depending on glucose concentration, incubation time and pH. Furthermore, the level of glycated immunoglobulin G from normal and diabetic subjects has been determined using the thiobarbituric acid reaction. The median for glycated immunoglobulin G, expressed as mmol 5-hydroxymethylfurfural per mol IgG, obtained from 20 normal and 29 diabetic subjects was 62 and 107, respectively. Glucose incubation of immunoglobulin G purified from rabbit anti-human-transferrin serum, from human anti-varicella/zoster virus serum and from human anti-lues-spirochete serum, respectively, leads to a marked decrease in biological activity, as determined in a micro complement fixation test. Inactivation of specific antibody was dependent on incubation time and glucose concentration employed. Loss in complement-fixing activity was observed at glycation levels well comparable to those found in diabetics. Topics: Animals; Complement Fixation Tests; Diabetes Mellitus; Furaldehyde; Glucose; Humans; Immunoglobulin G; In Vitro Techniques; Rabbits | 1985 |
Evaluation of a colorimetric method for determination of glycosylated hemoglobin.
We evaluated a colorimetric assay for glycosylated hemoglobin to determine the effects of several variables --oxalic acid concentration, extraneous glucose, hemoglobin concentration, hydrolysis interval, and 5-hydroxymethylfurfural destruction--and the precision. The interference seen when the blood glucose concentration exceeds 2.0 g/L (11 mmol/L) can be eliminated by washing the erythrocytes with 9 g/L saline. The accuracy of this assay is not influenced by hemoglobin concentrations from 80 to 150 g/L. The background nonspecific color, although substantial, is similar from sample to sample. After a 5-h hydrolysis at 100 degrees C, about 85% of the hexose is released, and the analytical recovery of 5-hydroxymethylfurfural is constant over a wide range of glycosylated hemoglobin concentrations. The 5th to 95th percentile reference interval for a population of 65 nondiabetic individuals was 4.6 to 6.1 mol per 100 mol of total hemoglobin. The range of values for a population of 85 diabetic patients was 6.9 to 20.4 mol per 100 mol. Topics: Blood Glucose; Colorimetry; Diabetes Mellitus; Erythrocytes; Evaluation Studies as Topic; Furaldehyde; Glycated Hemoglobin; Humans; Hydrolysis; Oxalates; Time Factors | 1983 |
Improved colorimetric assay for glycosylated hemoglobin.
This colorimetric assay for glycosylated hemoglobin can be performed in 120 min with equipment available in most clinical laboratories. The glucose moiety of glycosylated hemoglobin is converted to 5-hydroxymethylfurfural by heating with oxalic acid for 60 min is an autoclave at 124 degrees C and 124 kPa (18 lb/in.2). The adduct formed by reacting 2-thiobarbituric acid with hydroxymethylfurfural is measured photometrically and results are expressed either as nanomoles of hydroxymethylfurfural or as fructose equivalents. Within-assay and between-assay coefficients of variation were less than 2% and less than 3%, respectively. Comparison of results for 50 patients' specimens as measured by the present assay and as analyzed for hemoglobin A1c by liquid chromatography showed excellent correlation (r = 0.98). Topics: Chromatography, High Pressure Liquid; Colorimetry; Diabetes Mellitus; Fructose; Furaldehyde; Glycosides; Hemoglobin A; Humans; Indicators and Reagents; Reference Values | 1981 |
Automated colorimetric estimation of glycosylated haemoglobins.
The measurement of glycosylated haemoglobin is now widely used as a guide to glycaemic control in patients with diabetes mellitus. Present methods for measurement of glycosylated haemoglobin are either laborious, expensive or both. We describe a precise and inexpensive method for the automated analysis of glycosylated haemoglobin based on a colorimetric technique. The within-batch coefficient of variation ranged from 2.0 to 4.8% and between-batch was less than 11.0%. At least 200 samples can be analysed per day. Topics: Colorimetry; Diabetes Mellitus; Furaldehyde; Glycosides; Hemoglobin A; Humans | 1980 |
Photometric determination of glycosylation of hemoglobin in diabetes mellitus.
We evaluated glycosylation of hemoglobin (HbA + HbA1) in 25 control subjects and in 133 diabetic patients who were in various stages of blood glucose control, by measuring ketoamine-linked hexoses in hemoglobin. These hexoses were converted by digestion with 10 mol/L acetic acid for 16 h at 100 +/- 5 degrees C to 5-hydroxymethylfurfuraldehyde, which was quantitated by reaction with 2-thiobarbituric acid. Glycosylation of hemoglobin was expressed as micromoles of hydroxymethylfurfuraldehyde per gram of globin protein (the "HMF index"). A mean HMF index of 1.67 (SD = 0.23) was obtained for controls; that for diabetic patients was 2.93 (SD 0.95). The index correlated well (r = 0.83, p < 0.001) with average blood glucose concentration as measured during the preceding 16 weeks, over a wide range of glucose values (1 to 6 g/L). It correlated even better (r = 0.92, p < 0.001) when corrected for variations in hemoglobin concentration. Thus measurement of ketoamine-linked hexoses of hemoglobin or HMF index provides an independent and useful alternative to the currently used methods that measure only HbA1 or HbA1c. Topics: Blood Glucose; Chemical Phenomena; Chemistry; Diabetes Mellitus; Female; Furaldehyde; Glycosides; Hemoglobin A; Hexoses; Humans; Male; Photometry; Thiobarbiturates | 1980 |