期刊
MICROCHIMICA ACTA
卷 151, 期 1-2, 页码 47-52出版社
SPRINGER WIEN
DOI: 10.1007/s00604-005-0408-6
关键词
L-tyrosine; multi-wall carbon nanotube; nanobioelectrochemistry; square wave stripping voltammetry
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 728mV at the bare electrode, Delta E-p = 57mV. 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 x 10(-6) - 5.0 x 10(-4) mol L-1. The detection limit was 4.0 x 10(-7) mol L-1. The method is simple, quick, sensitive and accurate.
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