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Inne
Copper complexes of dipeptides with L-Lys as C-terminal residue: a thermodynamic and spectroscopic study.
Autorzy
Rok wydania
2000
Czasopismo
Numer woluminu
19
Strony
2409-2419
DOI
10.1016/S0277-5387(00)00539-8
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Complex-formation equilibria of some dipeptides (glycyl-lysine, alanyl-lysine, histidyl-lysine and β-alanyl-lysine) with the Cu(II) ion have been studied in aqueous solution, at I=0.1 moldm−3 (KNO3) and T=25°C. Protonation and complex-formation constants have been determined potentiometrically; complex-formation model and species stoichiometry have been checked carefully by means of different spectroscopic techniques (visible absorption, CD, EPR). The structure of the main complex species is discussed, on the basis of thermodynamic data obtained by direct calorimetry. The formation of binuclear species is demonstrated and it is suggested that the side amino group of lysine participates in complex formation at alkaline pH values.
Słowa kluczowe
Copper-dipeptide complexes, Glycyl-lysine, Alanyl-lysine, Histidyl-lysine, β-alanyl-lysine
Adres publiczny
https://doi.org/10.1016/S0277-5387(00)00539-8
Strona internetowa wydawcy
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