scholarly journals The Complexation Reaction of 1-(Hydroxy-4-methyl-2-phenylazo)-2-naphthol-4-sulfonic Acid (Calmagite) with Divalent Metal Ions and Use as a Metallochromic Indicator

1969 ◽  
Vol 42 (3) ◽  
pp. 835-837 ◽  
Author(s):  
Mutsuo Kodama ◽  
Katsumi Miyamoto
Keyword(s):  
Metal Ions ◽  
Sulfonic Acid ◽  
Divalent Metal ◽  
Complexation Reaction ◽  
Divalent Metal Ions

Synthesis and Chelation Properties of a New Polymeric Ligand Derived from 1-Amino-2-Naphthol-4-Sulfonic Acid

2015 ◽  
Vol 98 (1) ◽  
pp. 188-191
Author(s):  
Dhanasekaran Manivannan ◽  
Valsala Madhavan Nair Biju
Keyword(s):  
Metal Ions ◽  
Sulfonic Acid ◽  
Divalent Metal ◽  
Chelating Resin ◽  
Spectral Studies ◽  
Divalent Metal Ions ◽  
Solid Sorbent ◽  
Lead And Zinc ◽  
Copper Manganese ◽  
Seawater Samples

Abstract A novel chelating resin for preconcentration of heavy metals from various seawater samples has been developed by condensing 1-amino-2-hydroxy-7-[(4-hydroxyphenyl)diazenyl] naphthalene-4-sulfonic acid (AHDNS) with formaldehyde (1:2 mole ratio) in the presence of oxalic acid as the catalyst. The resin thus obtained was used as a solid sorbent for the separationof divalent metal ions present attrace levels in seawater. The functionalized phenol (AHDNS) was characterized by spectral studies. The polymeric resin AHDNS-formaldehyde (AHDNS-F) obtained by condensing thefunctionalized phenol and formaldehyde was characterized by IR and NMR spectral studies. The chelating property of the AHDNS-F resin towards divalent metal ions was studied as a function of pH and in the presence of electrolyte. The metal uptake properties of the resin were determined by using an atomic absorption spectrophotometer. This procedure was validated for recovery of divalent metal ions from seawater samples. The recoveries of cadmium, cobalt, copper, manganese, lead, and zinc were above 92% under the optimum preconcentration conditions. The LOD was <0.73 μg/L and the RSDs were <2%. Thus, the AHDNS-F resin can be widely used as a solid sorbent for the preconcentration of trace metals at ppm levelsin seawater samples.

Interaction of divalent metal ions with the NADP+-malic enzyme from maize leaves

1991 ◽  
Vol 81 (4) ◽  
pp. 462-466 ◽  
Author(s):  
Maria Fabiana Drincovich ◽  
Alberto A. Iglesias ◽  
Carlos S. Andreo
Keyword(s):  
Metal Ions ◽  
Malic Enzyme ◽  
Divalent Metal ◽  
Divalent Metal Ions ◽  
Maize Leaves

scholarly journals Regulation of divalent metal ions to the aggregation and membrane damage of human islet amyloid polypeptide oligomers

RSC Advances ◽  
2021 ◽  
Vol 11 (21) ◽  
pp. 12815-12825
Author(s):  
Yajie Wang ◽  
Feihong Meng ◽  
Tong Lu ◽  
Chunyun Wang ◽  
Fei Li
Keyword(s):  
Metal Ions ◽  
Metal Binding ◽  
Membrane Damage ◽  
Islet Amyloid Polypeptide ◽  
Divalent Metal ◽  
Human Islet ◽  
Divalent Metal Ions ◽  
Islet Amyloid ◽  
Induced Membrane ◽  
Human Islet Amyloid Polypeptide

Their is a counteraction between a decrease in the disruptive ability of metal-associated oligomer species and an increase in the quantity of oligomers promoted by the metal binding in the activity of hIAPP induced membrane damage.

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