The effect of pH on horseradish peroxidase-catalyzed oxidation of melatonin: production of N1-acetyl-N2-formyl-5-methoxykynuramine versus radical-mediated degradation

2007 ◽  
Vol 42 (3) ◽  
pp. 291-296 ◽  
Author(s):  
Valdecir F. Ximenes ◽  
João Roberto Fernandes ◽  
Vânia B. Bueno ◽  
Luiz H. Catalani ◽  
Georgino H. de Oliveira ◽  
...  
Keyword(s):  
Horseradish Peroxidase ◽  
Effect Of Ph ◽  
Catalyzed Oxidation ◽  
Melatonin Production

Rate constants for reactions of horseradish peroxidase compounds I and II with 4-substituted arylboronic acids

1994 ◽  
Vol 72 (10) ◽  
pp. 2159-2162 ◽  
Author(s):  
Weimei Sun ◽  
Xiaoying Ji ◽  
Larry J. Kricka ◽  
H. Brian Dunford
Keyword(s):  
Horseradish Peroxidase ◽  
Rate Constants ◽  
Compound I ◽  
Arylboronic Acid ◽  
Experimental Conditions ◽  
Kinetic Measurements ◽  
Arylboronic Acids ◽  
Total Ionic Strength ◽  
Compound Ii ◽  
Catalyzed Oxidation

The rate constants for the reactions of horseradish peroxidase compound I (k1) and compound II (k2) with three 4-substituted arylboronic acids, which enhance chemiluminescence in the horseradish peroxidase catalyzed oxidation of luminol by hydrogen peroxide, were determined at pH 8.6, total ionic strength 0.11 M, using stopped-flow kinetic measurements. For comparison, the rate constants of the reactions of 4-iodophenol with compounds I and II were also determined under the same experimental conditions. The three arylboronic acid derivatives and their rate constants are: 4-biphenylboronic acid, k1 = (1.21 ± 0.08) × 106 M−1 s−1, k2 = (4.6 ± 0.2) × 105 M−1 s−1; 4-bromophenylboronic acid, k1 = (5.5 ± 0.2) × 104 M−1 s−1, k2 = (3.6 ± 0.2) × 104 M−1 s−1; and 4-iodophenylboronic acid, k1 = (1.1 ± 0.2) × 105 M−1 s−1, k2 = (1.3 ± 0.1) × 104 M−1 s−1. 4-Biphenylboronic acid, which shows comparable luminescent enhancement to 4-iodophenol, has the highest reactivity in the reduction of both compounds I and II among the three arylboronic acid derivatives tested.

ChemInform Abstract: Effect of pH in the Pd-Catalyzed Oxidation of D-Glucose to D-Gluconic Acid.

ChemInform ◽  
2010 ◽  
Vol 25 (31) ◽  
pp. no-no
Author(s):  
A. ABBADI ◽  
M. MAKKEE ◽  
W. VISSCHER ◽  
J. A. R. VAN VEEN ◽  
H. VAN BEKKUM
Keyword(s):  
Gluconic Acid ◽  
Effect Of Ph ◽  
Catalyzed Oxidation

The Effect of pH Control on the Selective Ruthenium-Catalyzed Oxidation of Ethers and Alcohols with Sodium Hypochlorite.

ChemInform ◽  
2004 ◽  
Vol 35 (19) ◽  
Author(s):  
Luca Gonsalvi ◽  
Isabel W. C. E. Arends ◽  
Pasi Moilanen ◽  
Roger A. Sheldon
Keyword(s):  
Sodium Hypochlorite ◽  
Ph Control ◽  
Effect Of Ph ◽  
Catalyzed Oxidation
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