Role of the Extraction Equilibrium Constant in the Countercurrent Multistage Solvent Extraction−Stripping Process for Metal Ions

1998 ◽  
Vol 37 (5) ◽  
pp. 1943-1949 ◽  
Author(s):  
Mikiya Tanaka ◽  
Kazuya Koyama ◽  
Junji Shibata
Keyword(s):  
Solvent Extraction ◽  
Metal Ions ◽  
Equilibrium Constant ◽  
Extraction Equilibrium

Adaptive Role of Lipids in Algae under Metal Ions Impact (a Review)

2018 ◽  
Vol 54 (6) ◽  
pp. 78-93
Author(s):  
V. V. Grubinko ◽  
O. I. Bodnar ◽  
A. I. Lutsiv ◽  
G. B. Viniarska
Keyword(s):  
Metal Ions ◽  
Adaptive Role

scholarly journals The Role of the Disulfide Bridge in the Copper (II) Binding by the Cyclic His4-Peptide

2021 ◽  
Vol 22 (12) ◽  
pp. 6458
Author(s):  
Aleksandra Pieniężna ◽  
Weronika Witak ◽  
Aneta Szymańska ◽  
Justyna Brasuń
Keyword(s):  
Metal Ions ◽  
Coordination Mode ◽  
Transition Metal Ions ◽  
Disulfide Bridge ◽  
Chain Flexibility ◽  
Vis Spectroscopy ◽  
Ph Range ◽  
Cd Studies ◽  
Metal Ratios

In this paper, we present studies on the influence of the disulfide bridge on the copper (II) ions’ binding abilities by the cyclic His4-peptide. The studied ligand HKHPHRHC-S-S-C consists of nine amino acids. The cyclic structure was obtained through a disulfide bridge between two cysteinyl groups. Moreover, this peptide is characterized by the presence of four His residues in the sequence, which makes it an interesting ligand for transition metal ions. The potentiometric and spectroscopic (UV-Vis spectroscopy and circular dichroism spectroscopy (CD)) studies were carried out in various molar ligand to metal ratios: 2:1, 1:1, and 1:2, in the pH range of 2.5–11 at 25 °C. The results showed that the cyclic His4-peptide promotes dinuclear complexes in each of these systems and forms the final dinuclear species with the {NIm, 3N-amide}{NIm, 3N-amide} coordination mode. The obtained data shows that cyclization by the formation of the disulfide bond has an impact on the peptide chain flexibility and appearance of additional potential donors for metal ions and influences the copper (II) ions’ coordination.

scholarly journals Solvent Extraction Equilibrium in the CuSO4–H2SO4–LIX 984–ESCAID 103 Systern

1999 ◽  
Vol 23 (8) ◽  
pp. 518-519
Author(s):  
Francisco Jose Alguacil ◽  
Jaime Simpson ◽  
Patricio Navarro
Keyword(s):  
Solvent Extraction ◽  
Thermodynamic Model ◽  
Distribution Coefficients ◽  
Extraction System ◽  
Extraction Equilibrium ◽  
Solvent Extraction System ◽  
Measured Distribution

A previously determined thermodynamic model for extraction equilibrium is used as a basis to predict experimentally measured distribution coefficients for the CuSO4–H2SO4–LIX 984–Escaid 103 solvent extraction system at 25 °C and aqueous copper concentrations in the range 0.01–2.0 gL−1, the copper loading isotherm is also obtained.

The Role of Transition Metal Ions in Ascorbate-Induced Cytotoxicity in Pancreatic Cancer

2014 ◽  
Vol 76 ◽  
pp. S124
Author(s):  
Juan Du ◽  
Brett A Wagner ◽  
Garry R Buettner ◽  
Joseph J Cullen
Keyword(s):  
Pancreatic Cancer ◽  
Transition Metal ◽  
Metal Ions ◽  
Transition Metal Ions
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