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Barfoed's test is a chemical test used for detecting the presence of monosaccharides. It is based on the reduction of copper(II) acetate to copper(I) oxide (Cu 2 O), which forms a brick-red precipitate. [1] [2] RCHO + 2Cu 2+ + 2H 2 O → RCOOH + Cu 2 O↓ + 4H + (Disaccharides may also react, but the reaction is much slower.)
D-xylose absorption test is a medical test performed to diagnose conditions that present with malabsorption of the proximal small intestine [1] due to defects in the integrity of the gastrointestinal mucosa. [2] D-xylose is a monosaccharide, or simple sugar, that does not require enzymes for digestion prior to absorption. Its absorption ...
Christen Thomsen Barfoed. Christen Thomsen Barfoed (16 June 1815 – 30 April 1889) was a Danish chemist credited with the development of a method to detect monosaccharide sugars in a solution, now known as the Barfoed's test. [1] [2] Barfoed is also credited with having introduced systematic chemical analyses in Danish agricultural sciences. [3]
The two organs most commonly affected are the liver and the skeletal muscle. Glycogen storage diseases that affect the liver typically cause hepatomegaly and hypoglycemia; those that affect skeletal muscle cause exercise intolerance, progressive weakness and cramping. [1] Glucose-6-phosphate isomerase deficiency affects step 2 of glycolysis.
Impaired glucose tolerance (IGT) is diagnosed with an oral glucose tolerance test. According to the criteria of the World Health Organization and the American Diabetes Association, impaired glucose tolerance is defined as: [13] [14] two-hour glucose levels of 140 to 199 mg per dL (7.8 to 11.0 mmol/L) on the 75-g oral glucose tolerance test.
Glucose-galactose malabsorption is a rare disorder; only a few hundred cases have been identified worldwide. However, as many as 10 percent of the population may have a somewhat reduced capacity for glucose absorption without associated health problems. This condition may be a milder variation of glucose-galactose malabsorption. [2]