Dual screen-printed electrode modified by gold – palladium binary system for flow-injection amperometric determination of dopamine and ascorbic acid
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Dual screen-printed electrode modified by gold – palladium binary system for flow-injection amperometric determination of dopamine and ascorbic acid

L.G. Shaidarova*, Y.A. Leksina**, I.A. Chelnokova***, M.A. Il'ina****, A.V. Gedmina*****, H.C. Budnikov******

Kazan Federal University, Kazan, 420008 Russia

E-mail: *larisashaidarova@mail.ru, **leksina_yulia@mail.ru, ***irina.chelnokova@mail.ru, ****marina_ilina16@mail.ru, *****anna.gedmina@mail.ru, ******Herman.Budnikov@kpfu.ru

Received September 12, 2017

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Abstract

The gold – palladium binary system electrode posited on the surface of screen-printed carbon electrodes exhibits electrocatalytic activity in the oxidation of dopamine and ascorbic acid. The effect is reflected in a decrease of overvoltage and an increase of oxidation current of organic compounds. The possibility of simultaneous voltammetric determination of dopamine and ascorbic acid at dual screen-printed electrode modified by gold – palladium binary system has been established. A method of flow-injection amperometric determination of dopamine and ascorbic acid on this electrode has been introduced. A linear dependence of the response on analytes has been observed in the ranges from 5?10–11 to 5?10–4 M and from 5?10–10 to 5?10–4 M for dopamine and ascorbic acid, respectively.

Keywords: chemically modified electrodes, gold – palladium binary system, dual screen-printed electrode, amperometric determination of dopamine and ascorbic acid, flow-injection analysis

Acknowledgments. The work is performed according to the Russian Government Program of Competitive Growth of Kazan Federal University.

Figure Captions

Fig. 1. The scheme of flow-injection system: 1 – squeeze pump, 2 – injector, 3– flowing liquid junction cell, 4– biopotentiostat.

Fig. 2. Cyclic voltammetric curves obtained on a screen-printed electrode modified by the Au-Pd binary system in the absence (1) and presence (2) of dopamine (С = 1?10–3 М), background electrolyte – 0.1 М H2SO4 (a); graphs showing the dependence of current parameters on substrate concentration (b) and the value of  I√v on √v (c) in dopamine oxidation on chemically modified electrode.

Fig. 3. Cyclic voltammetric curves obtained on a screen-printed electrode with the Au-Pd binary system in the absence (1) and presence of ascorbic acid and dopamine (2) ((С = 1?10–3 М), background electrolyte – 0.1 М H2SO4 (a). The scheme of electrocatalysis on chemically modified electrode (b).

Fig. 4. Analytical response on dual screen-printed electrode under the conditions of flow-injection analysis (a), dependence of the oxidation current of dopamine (1) and ascorbic acid (2) (С = 5?10–3 М) on chemically modified electrode with the Au-Pd electrodeposited binary system on the applied potential (b), and current rate (c) in the flow-injection system, background electrolyte – 0.1 M H2SO4.

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For citation: Shaidarova L.G., Leksina Y.A., Chelnokova I.A., Il'ina M.A., Gedmina A.V., Budnikov H.C. Dual screen-printed electrode modified by gold – palladium binary system for flow-injection amperometric determination of dopamine and ascorbic acid. Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki, 2018, vol. 160, no. 1, pp. 40–53. (In Russian)


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