Reducing agents sugars

Other amino acid derivatives act as methylating and reducing agents Sugars store energy, enable recognition, and protect sensitive functional groups... 

Deep blue solution, reduced to CugO on heating with reducing agents (sugar test in urine). 

Benedict solution Aqueous solution of Na2C03, CuSO, and sodium citrate used for testing for reducing agents, particularly sugars, which give red-yellow colours or precipitates. 

Formation of silver mirror or precipitate of silver indicates reducing agent. (This is often a more sensitive test than I (a) above, and some compounds reduce ammoniacal silver nitrate but are without effect on Fehling s solution.) Given by aldehydes and chloral hydrate formates, lactates and tartrates reducing sugars benzoquinone many amines uric acid. 

Ghromium(III) Compounds. Chromium (ITT) is the most stable and most important oxidation state of the element. The E° values (Table 2) show that both the oxidation of Cr(II) to Cr(III) and the reduction of Cr(VI) to Cr(III) are favored in acidic aqueous solutions. The preparation of trivalent chromium compounds from either state presents few difficulties and does not require special conditions. In basic solutions, the oxidation of Cr(II) to Cr(III) is still favored. However, the oxidation of Cr(III) to Cr(VI) by oxidants such as peroxides and hypohaUtes occurs with ease. The preparation of Cr(III) from Cr(VI) ia basic solutions requires the use of powerful reducing agents such as hydra2ine, hydrosulfite, and borohydrides, but Fe(II), thiosulfate, and sugars can be employed in acid solution. Cr(III) compounds having identical counterions but very different chemical and physical properties can be produced by controlling the conditions of synthesis. 

This is the basis of the very sensitive Fehling s test for sugars and other reducing agents. A solution of a copper(H) salt dissolved in alkaline tartrate solution is added to the substance in question. If this is a reducing agent then a characteristic red precipitate is produced. 

A number of reducing agents have been determined directly using tetrazolium salts. Thus, the analyses of reducing sugars,423,424 hydraz-ides, 425 sulfides and thiols,426 ascorbic acid,427,428 formaldehyde,429 L-... 

In 2000, Koos described a procedure for the reduction of the nitroolefin 140 to 5-deoxy sugar oxime 141 using tin(n) chloride as a reducing agent (Scheme 44).95... 

Reduction of aldonolactones and their derivatives with isotopically modified reducing agents leads to sugars labeled at the anomeric center. Glycosides substituted with deuterium or labeled with tritium are widely employed for kinetic isotope-effect measurements, mechanistic studies, isotope-tracing experiments, and so on. 

Reduction of the aldehyde or ketone group in a sugar is readily achieved using a variety of reducing agents. Reduction occurs on the small amount of open-chain form present at equilibrium. As the open-chain form is removed, the equilibrium is disturbed until total reduction is achieved. The products are polyhydroxy compounds termed alditols. Reduction... 

Glucose is also used as the reducing agent in the preparation of organic compounds. Wood sugars have reducing properties that are equivalent to those of products for like purposes from any source. 

No 2 solns in amts sufficient to fill half of a test tube and fill the remaining half with an equal volume of glycerin. Stopper the tube so that no air remains under stoppei and let it stand for 12 hrs. A reddish ppt indicates the presence of reducing agents which will interfere in testing for glucose or sugar, unless the ppt is removed by filtration... 

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