Abstract
The paper presents the catalytic influence of nicotinamide on Zn2+ electroreduction. Changes in differential capacitance curves of the double layer Hg/acetate buffer pH = 6.0 as well as changes in zero charge potential values indicate nicotinamide adsorption with the aromatic ring on the electrode surface. This adsorption is responsible for its catalytic influence on the kinetics of Zn2+ ion electroreduction from the acetate buffer solution. The effect is stronger with increasing nicotinamide concentration. It is confirmed by the following factors: the increase in standard electrode rate constants, the reduction in the distance between anode and cathodic peaks on CV voltamperograms, and the decrease in activation resistance associated with the electrode reaction for nicotinamide solutions relative to those obtained in the case of reference solution. A very high catalytic capacity of vitamin B3 on Zn2+ ion electroreduction kinetics from pH = 6.0 acetate buffer can be explained by the formation of an active complex on the surface of the mercury electrode: Zn2+ nicotinamide, which can be described as a bridge facilitating electron exchange.Graphical An active complex NAM-Zn2+ is formed on the surface of the mercury electrode and it is a “bridge” that facilitates charge exchange during the electrode process.
Highlights
Nicotinamide (NAM), known as vitamin B3, is a direct precursor of the synthesis of many important coenzymes of oxide-reduction NAD+ and NADP+, which participate in hydrogen and electron transfers in cellular respiration, glycolysis, and lipid biosynthesis
It is commonly known that the values of electric potentials of cell membranes are close to those used in the studies of Zn2+ electroreduction at mercury electrode
Studies reported in this paper show the nicotinamide effect on Zn2+ ions electroreduction kinetics at mercury electrode in acetate buffer at pH = 6.0
Summary
Nicotinamide (NAM), known as vitamin B3, is a direct precursor of the synthesis of many important coenzymes of oxide-reduction NAD+ and NADP+, which participate in hydrogen and electron transfers in cellular respiration, glycolysis, and lipid biosynthesis. Structural chemical formula of nicotinamide (NAM) In turn, zinc is one of the main trace elements of the body, performing a catalytic, structural, and regulatory role It is commonly known that the values of electric potentials of cell membranes are close to those used in the studies of Zn2+ electroreduction at mercury electrode. Electrochemical processes at mercury electrode can be used as a pattern system for studies on the effects occurring at biologic membranes interface
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