Therefore, the reaction of sugar with concentrated nitric acid was closely examined at temperatures of 100 and 110/sup 0/C and in the presence of low levels of iron )0 to 0.2 M Fe(III)). Efficiencies of the sugar destruction by nitric acid ranged from 2.56 to 2.93 mol of acid consumed...
Reactions of .alpha.-hydroxy carbonyl compounds with azodicarboxylates and triphenylphosphine: synthesis of .alpha.-N-hydroxy amino acid derivatives Reaction of the α-hydroxy esters (I) with the N-acyl-O-benzylhydroxylamine (II) and the azodicarboxylate (III) in the presence of triphenylphosphine yi...
The effects of -irradiation on the antioxidative activity developing in the amino acid-sugar reaction were investigated. The antioxidative activity of the nondialyzable melanoidin prepared from glycine and d-glucose was not much affected by -irradiation. However, the development of the antioxidative ...
There is no appreciable sugar reaction with vinegar, which contains a dilute solution of acetic acid, CH3C=O(OH). Most white vinegar is about 5 percent acetic acid and about 95 percent water, so you can imagine how tart its taste might be without this dilution factor. There is a differenc...
The solubility of sugar in vinegar is negligible; acetic acid in solution and sucrose do not undergo a chemical reaction to any appreciable extent. But sugar does dissolve in water, and this solubility can be used to generate a form of edible sugar cryst
After eight days of such a regimen, the mice were euthanized, their lenses promptly isolated and frozen in liquid nitrogen, and RNAs isolated by extraction with standard methods and converted to cDNAs. The miR-specific cDNAs were then quantified by polymerase chain reaction (PCR) using a 96-...
Guided by gut sensory cues, humans and animals prefer nutritive sugars over non-caloric sweeteners, but how the gut steers such preferences remains unknown. In the intestine, neuropod cells synapse with vagal neurons to convey sugar stimuli to the brain within seconds. Here, we found that cholecy...
Aldolase Reaction with Sugar Diphosphates 来自 NCBI 喜欢 0 阅读量: 21 作者:AH Mehler,ME Cusic 摘要: Xylulose-, fructose-, and octulose-diphosphates are substrates for rabbit muscle aldolase with essentially identical K$_{ext{m}}$ values, but they are cleaved at different rates. After ...
Sterically unhindered primary amineswere better catalysts than ammonia, secondary amines, andsterically hindered primary amines (i.e.α-aminoisobutyric acid). Reactions catalyzed by primaryamines initially consumed formaldehyde and glycolaldehyde about15–20 times faster than an uncatalyzed control reaction....
Analyses for these sugars are generally based on the reaction of the amino groups with ninhydrin, the reagent used in the standard amino acid analyzer. This type of system may therefore be applied to the quantitative determination of amino sugars, with detection at 570 nm. Greater sensitivity is...