Highly efficient copper-catalysed oxidation of ascorbic acid by peroxynitrite

2001 ◽  
pp. 1484-1485 ◽  
Author(s):  
Yurii V. Geletti ◽  
Alan J. Bailey ◽  
Eric A. Boring ◽  
Craig L. Hill
Keyword(s):  
Ascorbic Acid ◽  
Highly Efficient ◽  
Catalysed Oxidation

Chemical Synthesis of Ascorbyl Palmitate in [BMIM]BF4

2011 ◽  
Vol 236-238 ◽  
pp. 1962-1965 ◽  
Author(s):  
Jun Min Ji
Keyword(s):  
Ascorbic Acid ◽  
Ionic Liquid ◽  
Sulfuric Acid ◽  
Chemical Synthesis ◽  
Palmitic Acid ◽  
Ascorbyl Palmitate ◽  
Highly Efficient ◽  
Concentrated Sulfuric Acid

Scorbyl palmitate is a safty and highly efficient lipophilic antioxidant.It is produced by a novel ionic liquid method: L-ascorbic acid was esterified with palmitic acid to synthesize ascorbyl palmitate,using concentrated sulfuric acid as chemical catalyst in 1-Butyl-3-methy limidazolium terafluoroborate ([BMIM]BF4).The yield of ascorbyl palmitate reached 69.6±1%.

scholarly journals Erythrocyte catalase inactivation (H2O2 production) by ascorbic acid and glucose in the presence of aminotriazole: role of transition metals and relevance to diabetes

1994 ◽  
Vol 303 (3) ◽  
pp. 935-939 ◽  
Author(s):  
P Ou ◽  
S P Wolff
Keyword(s):  
Ascorbic Acid ◽  
Transition Metal ◽  
Copper Ions ◽  
Acid Oxidation ◽  
H2o2 Production ◽  
Erythrocyte Catalase ◽  
Catalysed Oxidation ◽  
Dependent Inactivation ◽  
A Minor

Erythrocytes exposed to ascorbic acid in the presence of aminotriazole undergo a dose- and time-dependent inactivation of endogenous catalase which is proportional to environmental hydrogen peroxide (H2O2) concentrations. The production of H2O2 seems to be dependent upon the availability of transition metal chelatable by o-phenanthroline (OPT), although the kinetics of catalase inactivation and H2O2 production by externally added copper ions in the presence of OPT is complex. Furthermore, although glucose is also able to undergo a transition-metal-catalysed oxidation yielding H2O2, the production of H2O2 by glucose seems to be a minor process by comparison with ascorbic acid oxidation. Indeed, on the basis of these data, transition-metal-catalysed ascorbic acid oxidation is likely to be a more important source of oxidative stress in the diabetic state than hyperglycaemia.

Novel Composite Material Polyoxovanadate@MIL-101(Cr): A Highly Efficient Electrocatalyst for Ascorbic Acid Oxidation

2013 ◽  
Vol 5 (24) ◽  
pp. 13382-13390 ◽  
Author(s):  
Diana M. Fernandes ◽  
André D. S. Barbosa ◽  
João Pires ◽  
Salete S. Balula ◽  
Luís Cunha-Silva ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Composite Material ◽  
Acid Oxidation ◽  
Highly Efficient

The effect of oxidation on the iodine values of phospholid in milk, butter and washed-cream serum

1967 ◽  
Vol 34 (3) ◽  
pp. 231-238 ◽  
Author(s):  
E. G. Pont ◽  
Gwenda L. Holloway
Keyword(s):  
Ascorbic Acid ◽  
Solvent Extraction ◽  
Thin Layer ◽  
Chromatographic Mobility ◽  
Catalysed Oxidation ◽  
Iodine Values ◽  
Counter Current ◽  
Layer Chromatography ◽  
Counter Current Distribution ◽  
Lecithin Fraction

SummaryPhospholipid was isolated from milk, butter, and washed-cream serum by solvent extraction followed by simple counter-current distribution and thin-layer chromatography. Iodine values from fresh samples, determined by a micro-Wijs technique, ranged, for the cephalin fraction, from 70 to 86, for the lecithin fraction from 44 to 55, and for the sphingomyelin fraction from 36 to 44. In washed-cream serum, oxidation with copper and ascorbic acid led to reduction in extractable phosphorus, decreased chromatographic mobility of phospholipid and significant falls in the iodine values of the 3 phospholipid fractions. In milk, slight reductions in phospholipid iodine values were observed following copper-catalysed oxidation but they were not consistently significant. Iodine values of butter phospholipids remained unchanged even after gross oxidative quality deterioration.

Highly Efficient Zn–Cu–In–Se Quantum Dot-Sensitized Solar Cells through Surface Capping with Ascorbic Acid

2019 ◽  
Vol 11 (7) ◽  
pp. 6927-6936 ◽  
Author(s):  
Hua Zhang ◽  
Wenjuan Fang ◽  
Wenran Wang ◽  
Nisheng Qian ◽  
Xiaohe Ji
Keyword(s):  
Ascorbic Acid ◽  
Solar Cells ◽  
Quantum Dot ◽  
Highly Efficient ◽  
Surface Capping ◽  
Sensitized Solar Cells

scholarly journals A convenient spectrophotometric assay for the determination of l-ergothioneine in blood

1974 ◽  
Vol 139 (1) ◽  
pp. 237-242 ◽  
Author(s):  
Jan Carlsson ◽  
Marek P. J. Kierstan ◽  
Keith Brocklehurst
Keyword(s):  
Ascorbic Acid ◽  
Spectrophotometric Assay ◽  
Alkaline Media ◽  
Catalysed Oxidation

1. A convenient spectrophotometric assay for the determination of l-ergothioneine in solution including deproteinized blood haemolysate was developed. 2. The method consists of deproteinization by heat precipitation and Cu2+-catalysed oxidation of thiols such as glutathione and of l-ascorbic acid, both in alkaline media, and titration of l-ergothioneine (which is not oxidized under these conditions) by its virtually instantaneous reaction with 2,2′-dipyridyl disulphide at pH1. 3. This method and the results obtained with it for the analysis of human, horse, sheep and pig blood are compared with existing methods of l-ergothioneine analysis and the results obtained thereby.

scholarly journals The Copper-Catalysed Oxidation of Ascorbic Acid in Fruitand Vegetable Suspensions

1948 ◽  
Vol 1 (1) ◽  
pp. 50 ◽  
Author(s):  
FE Huelin ◽  
I Myee Stephens
Keyword(s):  
Ascorbic Acid ◽  
Protective Factors ◽  
Atmospheric Oxygen ◽  
Oxidation Catalysts ◽  
Catalysed Oxidation ◽  
The Stability ◽  
And Storage ◽  
Different Tissues

Considerable attention has been given to the retention of ascorbic acid byfruit and vegetables, both fresh and processed. The stability of ascorbic acid tooxidation can vary greatly in different tissues and under different conditions ofprocessing and storage. The factors concerned in this stability include (a) accessof atmospheric oxygen, as determined by the structure of the tissue and by processingprocedures; (b) oxidation catalysts, including enzymes, copper, and othersubstances in the tissues; and (c) "protective" factors.

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