Abstract.
The electrochemical behavior of L-tyrosine was investigated at a multi-wall carbon nanotubes modified glassy carbon electrode. L-tyrosine itself showed a poor electrochemical response at the bare glassy carbon electrode; however, a multi-wall carbon nanotubes film fabricated on the glassy carbon electrode can directly enhance the electrochemical signal of L-tyrosine when applying cyclic voltammetry and square wave stripping voltammetry without any mediator. Cyclic voltammetry was carried out to study the electrochemical oxidation mechanism of L-tyrosine, which shows a totally irreversible process and an oxidation potential of 671 mV at the modified electrode and 728 mV at the bare electrode, ΔEp = 57 mV. The anodic peak current linearly increases with the square root of scan rate in the low range, suggesting that the oxidation of L-tyrosine on the multi-wall carbon nanotubes modified electrode is a diffusion-controlled process. The square wave stripping voltammetry currents of L-tyrosine at the multi-wall carbon nanotubes modified electrodes increased linearly with the concentration in the range of 2.0 × 10−6–5.0 × 10−4 mol L−1. The detection limit was 4.0 × 10−7 mol L−1. The method is simple, quick, sensitive and accurate.
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Xu, Q., Wang, SF. Electrocatalytic Oxidation and Direct Determination of L-Tyrosine by Square Wave Voltammetry at Multi-wall Carbon Nanotubes Modified Glassy Carbon Electrodes. Microchim Acta 151, 47–52 (2005). https://doi.org/10.1007/s00604-005-0408-6
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DOI: https://doi.org/10.1007/s00604-005-0408-6