https://doi.org/10.15255/KUI.2018.020
Published: Kem. Ind. 67 (13) (2018) P65–P71
Paper reference number: KUI-20/2018
Paper type: Original scientific paper
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Influence of pH on Formation of L-histidine and Copper Complex

M. Drulak, A. Stanković and M. Medvidović-Kosanović

Abstract

Formation of L-histidine and copper complex in 1 : 1 ratio in the pH range from pH = 4 to pH = 10 was studied. Experiments were conducted in an electrochemical cell with a working glassy carbon electrode, reference Ag/AgCl electrode and a platinum wire counter electrode. The results have shown that copper and histidine complex is formed in the range from pH = 6 to pH = 10 and that the oxidation potential of metal ion in the complex became more negative with the increase in pH. Oxidation peak current increased until pH = 8, and thereafter decreased, while oxidation peak potential linearly decreased with increase in pH value.

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Keywords

copper, cyclic voltammetry, differential pulse voltammetry, L-histidine