Woltamperometric determination of copheine on electrode modified by Nafion film and mixed valent iridium oxides in energy beverages

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Abstract

Abstract. It was found that mixed valent iridium oxides electrodeposited on the surface of a glass-carbon electrode exhibit catalytic activity in the oxidation of caffeine. A more pronounced catalytic effect was obtained on the electrode modified with a composite based on a film of perfluorinated sulfonated polymer (Nafion) and mixed valent iridium oxides. A selective voltammetric method for the determination of caffeine was developed. A linear logarithmic dependence of current on caffeine concentration was observed in the range from 1×10–8 to 5×10–3 M. The developed method was used in the determination of caffeine in energy drinks.

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About the authors

L. G. Shaydarova

Kazan Federal University

Author for correspondence.
Email: larisashaidarova@mail.ru

A.M. Butlerov Chemical Institute

Russian Federation, 420008 Kazan

I. A. Chelnokova

Kazan Federal University

Email: larisashaidarova@mail.ru

A.M. Butlerov Chemical Institute

Russian Federation, 420008 Kazan

D. A. Koryakovtseva

Kazan Federal University

Email: larisashaidarova@mail.ru

A.M. Butlerov Chemical Institute

Russian Federation, 420008 Kazan

D. A. Kirilenko

Kazan Federal University

Email: larisashaidarova@mail.ru

A.M. Butlerov Chemical Institute

Russian Federation, 420008 Kazan

G. K. Budnikov

Kazan Federal University

Email: larisashaidarova@mail.ru

A.M. Butlerov Chemical Institute

Russian Federation, 420008 Kazan

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2. Fig. 1. Cyclic voltammograms obtained in the absence (1) and presence of 5 × 10–3 M caffeine (2–4) on the electrodes GUE (2), IrOx-GUE (1, 3), PFSP-IrOx-SUE (4) against the background of 0.1 M H2SO4. Insert: graph of the dependence of the peak current at Ep 1.35 V on the concentration of caffeine on the electrode PFSP-IrOx-SUE.

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3. Fig. 2. (a) Dependence of the caffeine oxidation current on the concentration of PFSP in a drop of water-ethanol solution applied to the electrode surface; (b) dependence of the caffeine oxidation current on the nature of the modifier on different electrodes (n = 3, P = 0.95).

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4. Fig. 3. Differential-pulse voltammograms obtained on the PFSP-IrOx-GUE electrode in a solution containing ascorbic acid (5 × 10–3 M), taurine (5 × 10–3 M), pyridoxine (1 × 10–4 M) and caffeine (5 × 10–3 M) against the background of 0.1 M H2SO4.

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