Acid–Base Properties of the (1-4,18-36) Fragments of Neuropeptide K and their Mono- and Polynuclear Copper(II) Complexes Products of Metal-Catalyzed Oxidation

2012 ◽  
Vol 52 (1) ◽  
pp. 130-143 ◽  
Author(s):  
Marta Błaszak ◽  
Elżbieta Jankowska ◽  
Teresa Kowalik-Jankowska
Keyword(s):  
Acid Base ◽  
Metal Catalyzed Oxidation ◽  
Metal Catalyzed ◽  
Catalyzed Oxidation ◽  
Neuropeptide K ◽  
Base Properties

Ambivalent role of ascorbic acid in the metal-catalyzed oxidation of oligopeptides

2021 ◽  
pp. 111510
Author(s):  
Nikolett Bodnár ◽  
Katalin Várnagy ◽  
Lajos Nagy ◽  
Gizella Csire ◽  
Csilla Kállay
Keyword(s):  
Ascorbic Acid ◽  
Metal Catalyzed Oxidation ◽  
Metal Catalyzed ◽  
Catalyzed Oxidation

scholarly journals Metal-catalyzed oxidation renders silver intensification selective. Applications for the histochemistry of diaminobenzidine and neurofibrillary changes.

1986 ◽  
Vol 34 (12) ◽  
pp. 1667-1672 ◽  
Author(s):  
F Gallyas ◽  
J R Wolff
Keyword(s):  
Hydrogen Peroxide ◽  
Oxidative Polymerization ◽  
Silver Coating ◽  
Neurofibrillary Changes ◽  
Iodide Ions ◽  
Tissue Sections ◽  
Metal Catalyzed Oxidation ◽  
Pre Treatment ◽  
Metal Catalyzed ◽  
Catalyzed Oxidation

Physical developers can increase the visibility of end products of certain histochemical reactions, such as oxidative polymerization of diaminobenzidine and selective binding of complex silver iodide ions to Alzheimer's neurofibrillary changes. Unfortunately, this intensification by silver coating is generally superimposed on a nonspecific staining originating from the argyrophil III reaction, which also takes place when tissue sections are treated with physical developers. The present study reveals that the argyrophil III reaction can be suppressed when tissue sections are treated with certain metal ions and hydrogen peroxide before they are transferred to the physical developer. The selective intensification of Alzheimer's neurofibrillary changes requires a pre-treatment with lanthanum nitrate (10 mM/liter) and 3% hydrogen peroxide for 1 hr. The diaminobenzidine reaction can be selectively intensified when physical development is preceded by consecutive treatments with copper sulfate (10 mM/liter, pH 5, 10 min) and hydrogen peroxide (3%, pH 7, 10 min). In peroxidase histochemistry, this high-grade intensification may help to increase specificity and reduce the threshold of detectability in tracing neurons with horseradish peroxidase or in immunohistochemistry when the peroxidase-antiperoxidase method is used.

Metal-catalyzed oxidation of immunoglobulin G impairs Fc receptor-mediated binding to macrophages

1998 ◽  
Vol 25 (7) ◽  
pp. 780-785 ◽  
Author(s):  
Linda Margiloff ◽  
Larissa Chaplia ◽  
Andrew Chow ◽  
Pravin C. Singhal ◽  
Joseph Mattana
Keyword(s):  
Immunoglobulin G ◽  
Fc Receptor ◽  
Metal Catalyzed Oxidation ◽  
Metal Catalyzed ◽  
Catalyzed Oxidation
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