Effect of copper(II) ions on kinetics of ascorbic acid oxidation by methylene blue

1995 ◽  
Vol 30 (5) ◽  
pp. 239-244 ◽  
Author(s):  
P. E. Strizhak
Keyword(s):  
Methylene Blue ◽  
Ascorbic Acid ◽  
Acid Oxidation ◽  
Effect Of Copper ◽  
Kinetics Of

Synthesis and evaluation of the influence of 5-sulfanyl-1,2,3-triazol-1-ylaminocarboxylic acid derivatives on kinetics of ascorbic acid oxidation

2016 ◽  
Vol 65 (1) ◽  
pp. 203-208 ◽  
Author(s):  
V. V. Emelianov ◽  
A. V. Musalnikova ◽  
E. A. Savateeva ◽  
Yu. S. Shakhmina ◽  
T. A. Kalinina ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Acid Oxidation ◽  
Kinetics Of

scholarly journals KINETICS OF THE OXIDATION OF VITAMIN C

2012 ◽  
Vol 12 (3) ◽  
pp. 291-296 ◽  
Author(s):  
Sitti Rahmawati ◽  
Bunbun Bundjali
Keyword(s):  
High School ◽  
Ascorbic Acid ◽  
Vitamin C ◽  
Reaction Kinetics ◽  
Senior High School ◽  
School Level ◽  
Acid Oxidation ◽  
High School Level ◽  
Exponential Factor ◽  
Kinetics Of

Vitamin C or ascorbic acid is needed by the human body but it is already damaged by the rise in temperature due to be oxidized to L-dehydroascorbic acid. This research aims to determine the kinetics of oxidation of ascorbic acid due to an increase if temperature (40-80 °C) and to design an ascorbic acid oxidation reaction laboratory module to be applied in the senior high school reaction kinetics curriculum. The determination of the kinetics of the oxidation of ascorbic acid applies the integral and half-change time methods, while the concentration of the remained ascorbic acid in sixty minute intervals is determined by iodimetric titration method. Decomposition of ascorbic acid was measured at 40, 50, 60, 70 and 80 °C. The results of this research indicate that at 40, 50, 60, 70 and 80 °C the kinetics of the oxidation of ascorbic acid is a first-order reaction with rate constants of 4.55 x 10-4, 5.85 x 10-4, 8.4 x 10-4, 1.1 x 10-3 and 1.015 x 10-3 min-1, respectively. Pre-exponential factor or the frequency of collisions is a factor which is a measure of the collision rate. The activation energy and the pre-exponential factor for the oxidation of ascorbic acid were found to be 20.73 kJ.mol-1 and 1.372 min-1. The procedure used in this study was modified into a laboratory module will be applied in the teaching of reaction kinetics at the senior high school level.

KINETICS OF ASCORBIC ACID OXIDATION CATALYSED BY Cu (Ⅱ)-TYROSINE COMPLEX

1987 ◽  
Vol 3 (06) ◽  
pp. 638-641
Author(s):  
Lu Chunsu ◽  
◽  
Yang Zhaopeng
Keyword(s):  
Ascorbic Acid ◽  
Acid Oxidation ◽  
Kinetics Of

Kinetics of Methylene Blue Reduction by Ascorbic Acid

1999 ◽  
Vol 76 (7) ◽  
pp. 970 ◽  
Author(s):  
Sarah Mowry ◽  
Paul J. Ogren
Keyword(s):  
Methylene Blue ◽  
Ascorbic Acid ◽  
Methylene Blue Reduction ◽  
Kinetics Of
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