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Kornyushova, E.A.; Kashevskii, A.V.; Arsent'ev, K.Y.; Pushkarev, B.G.; Nikiforov, S.B.; Safronov, A.Y.
Bioelectrochemistry (Amsterdam, Netherlands), 04/2019, Letnik: 126Journal Article
Titanium and platinum samples as components of bimetallic implants for the osteoregeneration process have been modified in solutions modeling biological systems and studied by means of cyclic voltammetry, electrochemical impedance spectroscopy and scanning probe microscopy. While aspartic and glutamic acids did not adsorb significantly on platinum in the potential region investigated, the presence of the amino acids affects oxide layer growth on the titanium surface under anodic polarization. The two studied amino acids behave differently on the titanium electrode surface due to differences in adsorption modes of these substances. The adsorption of the glutamic acid depends on the polarization potential to a large extent, and most of quantitative adsorption characteristics (EIS data, the surface roughness) undergo drastic change at the polarization potential value of 750 mV (vs. Ag/AgCl) in the presence of this substance. Equivalent circuit modeling of the surface processes has been carried out, and a scheme for aspartic and glutamic acid adsorption onto the titanium surface has proposed. Display omitted •Glutamic acid adsorption is determined by potential applied to the titanium electrode.•Aspartic acid adsorbs on a titanium electrode surface through both carboxylic groups.•Titanium surface characteristics depend on both potential and amino acid presence.•Dicarboxylic amino acids interact strongly with a titanium electrode surface.•Aspartic and glutamic amino acids adsorption on platinum electrode is negligible.
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