Faraday communications. Application of iodine-laser temperature jump to an irreversible enzyme reaction. Reaction of ascorbic acid with hydrogen peroxide catalysed by peroxidase

1994 ◽  
Vol 90 (20) ◽  
pp. 3201 ◽  
Author(s):  
Joachim Frank ◽  
Josef F. Holzwarth ◽  
H. Brian Dunford
Keyword(s):  
Hydrogen Peroxide ◽  
Ascorbic Acid ◽  
Temperature Jump ◽  
Enzyme Reaction ◽  
Iodine Laser ◽  
Laser Temperature Jump

Dynamics of AOT and AOT/Nonionic Cosurfactant Microemulsions. An Iodine-Laser Temperature Jump Study

Langmuir ◽  
2000 ◽  
Vol 16 (14) ◽  
pp. 5892-5899 ◽  
Author(s):  
Luís M. M. Nazário ◽  
João P. S. G. Crespo ◽  
Josef F. Holzwarth ◽  
T. Alan Hatton
Keyword(s):  
Temperature Jump ◽  
Iodine Laser ◽  
Laser Temperature Jump

Percolation of Water-in-Oil Microemulsions Studied by the Iodine Laser Temperature Jump

Langmuir ◽  
1995 ◽  
Vol 11 (7) ◽  
pp. 2405-2409 ◽  
Author(s):  
C. Petit ◽  
J. F. Holzwarth ◽  
M. P. Pileni
Keyword(s):  
Temperature Jump ◽  
Iodine Laser ◽  
Laser Temperature Jump

Mechanism of azide binding to chloroperoxidase and horseradish peroxidase: use of an iodine laser temperature-jump apparatus

Biochemistry ◽  
1988 ◽  
Vol 27 (17) ◽  
pp. 6628-6633 ◽  
Author(s):  
Josef F. Holzwarth ◽  
Frank Meyer ◽  
Michael Pickard ◽  
H. Brian Dunford
Keyword(s):  
Horseradish Peroxidase ◽  
Temperature Jump ◽  
Iodine Laser ◽  
Laser Temperature Jump ◽  
Azide Binding

An iodine laser temperature-jump apparatus

1985 ◽  
Vol 18 (10) ◽  
pp. 833-836 ◽  
Author(s):  
J Gormally ◽  
D M Bloor ◽  
S Higson
Keyword(s):  
Temperature Jump ◽  
Iodine Laser ◽  
Laser Temperature Jump

Synthesis and Characterization of Silver Nanoplates by a Seed-mediated Method

2019 ◽  
Vol 29 (3) ◽  
Author(s):  
Mai Ngọc Tuan Anh
Keyword(s):  
Hydrogen Peroxide ◽  
Silver Nanoparticles ◽  
Ascorbic Acid ◽  
Silver Nitrate ◽  
Sodium Borohydride ◽  
Trisodium Citrate ◽  
Synthesis And Characterization ◽  
Silver Nanoplates ◽  
Seed Mediated

Silver nanoplates (SNPs) having different size were synthesized by a seed-mediated method. The seeds -silver nanoparticles with 4 – 6 nm diameters were synthesized first by reducing silver nitrate with sodium borohydride in the present of Trisodium Citrate and Hydrogen peroxide. Then these seeds were developed by continue reducing Ag\(^+\) ions with various amount of L-Ascorbic acid to form SNPs. Our analysis showed that the concentratrion of L-Ascorbic acid, a secondary reducing agent, played an important role to form SNPs. In addition, the size and in-plane dipole plasmon resonance wavelenght of silver nanoplates were increased when the concentration of added silver nitrate increased. The characterization of SNPs were studied by UV-Vis, FE-SEM, EDS and TEM methods.

An ESR study of the peroxidase reaction catalyzed by human methaemoglobin and methaemoglobin-haptoglobin complex

1991 ◽  
Vol 56 (4) ◽  
pp. 923-932
Author(s):  
Jana Stejskalová ◽  
Pavel Stopka ◽  
Zdeněk Pavlíček
Keyword(s):  
Hydrogen Peroxide ◽  
Ascorbic Acid ◽  
Amino Acid ◽  
Peroxidase Activity ◽  
Amino Acid Analysis ◽  
Superoxide Radical ◽  
Esr Spectra ◽  
The Other ◽  
Delocalized Electron

The ESR spectra of peroxidase systems of methaemoglobin-ascorbic acid-hydrogen peroxide and methaemoglobin-haptoglobin complex-ascorbic acid-hydrogen peroxide have been measured in the acetate buffer of pH 4.5. For the system with methaemoglobin an asymmetrical signal with g ~ 2 has been observed which is interpreted as the perpendicular region of anisotropic spectrum of superoxide radical. On the other hand, for the system with methaemoglobin-haptoglobin complex the observed signal with g ~ 2 is symmetrical and is interpreted as a signal of delocalized electron. After realization of three repeatedly induced peroxidase processes the ESR signal of the perpendicular part of anisotropic spectrum of superoxide radical is distinctly diminished, whereas the signal of delocalized electron remains practically unchanged. An amino acid analysis of methaemoglobin along with results of the ESR measurements make it possible to derive a hypothesis about the role of haptoglobin in increasing of the peroxidase activity of methaemoglobin.

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