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Reducing sugars. Benedict's reagent (often called Benedict's qualitative solution or Benedict's solution) is a chemical reagent and complex mixture of sodium carbonate, sodium citrate, and copper (II) sulfate pentahydrate. [ 1 ] It is often used in place of Fehling's solution to detect the presence of reducing sugars and other reducing ...
Reducing form of glucose(the aldehyde groupis on the far right) A reducing sugaris any sugarthat is capable of acting as a reducing agent.[1] In an alkalinesolution, a reducing sugar forms some aldehydeor ketone, which allows it to act as a reducing agent, for example in Benedict's reagent. In such a reaction, the sugar becomes a carboxylic ...
Monosaccharides. In organic chemistry, Fehling's solution is a chemical reagent used to differentiate between water-soluble carbohydrate and ketone (>C=O) functional groups, and as a test for reducing sugars and non-reducing sugars, supplementary to the Tollens' reagent test. The test was developed by German chemist Hermann von Fehling in 1849.
Aldonic acids are the products of the oxidation of aldoses by Benedict's or Fehling's reagents. [ 6 ] Copper ions react with an aldose to form a red precipitate, Cu 2 O. The reaction scheme of an aldose being oxidized by the copper ions in a Benedict's reagent solution. The R group provided is an example of a sugar backbone.
Infobox references. 3,5-Dinitrosalicylic acid (DNS or DNSA, IUPAC name 2-hydroxy-3,5-dinitrobenzoic acid) is an aromatic compound that reacts with reducing sugars and other reducing molecules to form 3-amino-5-nitrosalicylic acid, which strongly absorbs light at 540 nm. It was first introduced as a method to detect reducing substances in urine ...
In organic chemistry, a ketose is a monosaccharide containing one ketone (>C=O) group per molecule. [1][2] The simplest ketose is dihydroxyacetone ((CH2OH)2C=O), which has only three carbon atoms. It is the only ketose with no optical activity. All monosaccharide ketoses are reducing sugars, because they can tautomerize into aldoses via an ...
Galactose (/ ɡəˈlæktoʊs /, galacto- + -ose, "milk sugar"), sometimes abbreviated Gal, is a monosaccharide sugar that is about as sweet as glucose, and about 65% as sweet as sucrose. [ 2 ] It is an aldohexose and a C-4 epimer of glucose. [ 3 ] A galactose molecule linked with a glucose molecule forms a lactose molecule.
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.)
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