Journal
ANALYTICAL METHODS
Volume 5, Issue 18, Pages 4859-4864Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ay40773j
Keywords
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Funding
- National Natural Science Foundation of China [21271127, 61171033]
- Nano-Foundation of Science and Techniques Commission of Shanghai Municipality [12nm0504200]
- Leading Academic Discipline Project of Shanghai Municipal Education Commission [J50102]
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We report a sensor platform for the determination of L-tryptophane. It is based on a carbon paste electrode that was modified with LaCoO3 poriferous nanofibers that were synthesized by electrospinning and subsequent thermal treatment. The structures and morphologies of LaCoO3 poriferous nanofibers were characterized by X-ray diffraction spectrum and scanning electron microscopy. The electrochemical performance of the sensor was evaluated by cyclic voltammetry and amperometry, and the results demonstrated that it exhibits strong electrocatalytical activity towards the oxidation of L-tryptophan in 0.1 mol L-1 phosphate buffer solution (pH 3.0). The linear range of L-tyrosine was 5.0 x 10(-8) to 5.0 x 10(-6) mol L-1 with a low detection limit down to 1.0 x 10(-8) mol L-1. Moreover, the modified electrode exhibited high selectivity, long-term stability and fast current response, demonstrating its feasibility for the analytical purpose.
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