Complexation reaction of metal ions with peptide systems. Part XIII. Stability constants and thermodynamic functions of praseodymium(III), neodymium(III) and samarium(III) with L-tyrosylglycylglycine and L-leucylglycylglycine

1981 ◽  
Vol 47 (1) ◽  
pp. 117-119 ◽  
Author(s):  
R.S. Sandhu ◽  
Jatinder Singh Gandhi ◽  
Rakesh Kumar
Keyword(s):  
Metal Ions ◽  
Stability Constants ◽  
Thermodynamic Functions ◽  
Complexation Reaction

Critical evaluation of stability constants and thermodynamic functions of metal complexes of crown ethers (IUPAC Technical Report)

2003 ◽  
Vol 75 (1) ◽  
pp. 71-102 ◽  
Author(s):  
Francoise Arnaud-Neu ◽  
Rita Delgado ◽  
Sílvia Chaves
Keyword(s):  
Metal Ions ◽  
Metal Complexes ◽  
Stability Constants ◽  
Crown Ethers ◽  
Thermodynamic Functions ◽  
Critical Evaluation ◽  
Earth Metal ◽  
Published Data ◽  
Technical Report ◽  
Alkaline Earth Metal Ions

Stability constants and thermodynamic functions of metal complexes of crown ethers in various solvents published between 1971 and the beginning of 2000 have been critically evaluated. The most studied crown ethers have been selected: 1,4,7,10 tetraoxacyclododecane (12C4), 1,4,7,10,13 pentaoxacyclopentadecane (15C5), and 1,4,7,10,13,16 hexaoxacyclooctadecane (18C6). The metal ions chosen are: alkali and alkaline earth metal ions, Ag+, Tl+, Cd2+, and Pb2+. The solvents considered are: water, methanol, ethanol, and their mixtures, as well as acetonitrile, N,N'-dimethylformamide, dimethylsulfoxide, and propylene carbonate. The published data have been examined and grouped into two categories, “accepted” and “rejected”. The “accepted” values were considered as: (i) recommended (R), when the standard deviations (s.d.) on the constant K or on ΔrH were inferior to 0.05 lg unit or inferior to 1 kJ mol−1, respectively; (ii) provisional (P), when s.d. is superior to 0.05 and inferior to 0.2 for lg K or s.d. is superior to 1 and inferior to 2 kJ mol−1 for ΔrH; (iii) recommended 1 (R1), if the values were obtained by a single research group, but were considered reliable in comparison with related systems, and considering that the research team usually presents R-level values for other similar systems.

scholarly journals Stability constants of Nicotinic acid (vitamin B3) complexes with transition metal ions

2020 ◽  
Vol 2 (7) ◽  
pp. 136-138
Author(s):  
Shalini Dengle ◽  
Mahesh Shivoorkar ◽  
Momin Nishad Parvin ◽  
Ayesha Nuzat Durrani
Keyword(s):  
Transition Metal ◽  
Nicotinic Acid ◽  
Metal Ions ◽  
Stability Constants ◽  
Transition Metal Ions ◽  
Vitamin B3

scholarly journals Copper(II)-complexation by non enzymatically glycated peptides

2004 ◽  
Vol 22 (SI - Chem. Reactions in Foods V) ◽  
pp. S106-S108
Author(s):  
S. T Seifert ◽  
R. Krause ◽  
K. Gloe ◽  
T. Henle
Keyword(s):  
Aqueous Solution ◽  
Metal Ions ◽  
Stability Constants ◽  
Maillard Reaction ◽  
Metal Binding ◽  
Maillard Reaction Products ◽  
Reaction Products ◽  
Nonenzymatic Glycation ◽  
The Stability

The purpose of our work was to examine the metal binding abilities of selected peptide bound Maillard reaction products (MRPs). The N<sup>α</sup>-hippuryl-protected MRPs N<sup>ε</sup>-fructoselysine and N<sup>ε</sup>-carboxymethyllysine were synthesised and measurement of stability constants for complexes formed with the physiologically important metal ions copper(II) and zinc(II) was carried out in aqueous solution (T = 298.1 K; I = 0.1M KNO<sub>3</sub>) using pH-potentiometry. The stability constants of N<sup>ε</sup>-fructoselysine and N<sup>ε</sup>-carboxymethyllysine with Cu(II) proved that new coordination centres are formed by the nonenzymatic glycation of proteins. With zinc(II) no complexation was observed. Physiological consequences are discussed, but further studies are necessary in order to clarify the effects of this phenomenon.

Simultaneous determination of stability constants of humate complexes with various metal ions using multitracer technique

1997 ◽  
Vol 198 (1) ◽  
pp. 61-71 ◽  
Author(s):  
Yoshio Takahashi ◽  
Yoshitaka Minai ◽  
Shizuko Ambe ◽  
Yoshihiro Makide ◽  
Fumitoshi Ambe ◽  
...  
Keyword(s):  
Metal Ions ◽  
Simultaneous Determination ◽  
Stability Constants
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