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The effect of carboxylate groups on the complexation of metal ion with oligopeptides – Potentiometric investigation.

Inorganica Chimica Acta.. 2017-07; 
Norbert Lihi, Márton Lukács, Mária Raics, Györgyi Szunyog, Katalin Várnagy, Csilla Kállay.
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Catalog Products ... as Asp 2 ), AspAspAsp (abbreviated as Asp 3 ), AspAspAspAsp (abbreviated as Asp 4 ), AspAla, AspGlu, GluGlu (abbreviated as Glu 2 ), GlyAsp, and GluGluGlu (abbreviated as Glu 3 ) were purchased from Bachem AG (Switzerland), while GlyAspGly was from GenScript Co. ... Get A Quote

摘要

Iron(II), iron(III), cobalt(II), zinc(II) cadmium(II) and lead(II) complexes of Asp2 and Asp3 and other Asp/Glu containing ligands were studied by potentiometry. Our goal was to study the influence of β- and γ-carboxylate groups as well as the increased negative charge of the ligands on the complex formation processes. Mainly 1:1 species are present, the formation of bis(ligand) complexes is not typical for these systems. It can be concluded that the effect of side chain carboxylate groups on the stability of complexes is especially significant in the case of lead(II) and cadmium(II). The greater the number of carboxylic groups there are in the system, the more stable complexes are formed with the studied met... More

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