Electrochemical Behavior and Determination of L‐Tyrosine at Single‐walled Carbon Nanotubes Modified Glassy Carbon Electrode |
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Authors: | Xiaozhi Yu Zhibin Mai Yun Xiao Xiaoyong Zou |
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Affiliation: | School of Chemistry and Chemical Engineering, Sun Yat‐Sen University, Guangzhou 510275, P.?R. China |
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Abstract: | Based on single‐walled carbon nanotubes (SWCNTs) modified glassy carbon electrode (GCE/SWCNTs), a novel method was presented for the determination of L ‐tyrosine. The GCE/SWCNTs exhibited remarkable catalytic and enhanced effects on the oxidation of L ‐tyrosine. In 0.10 mol/L citric acid‐sodium citrate buffer solution, the oxidation potential of L ‐tyrosine shifted negatively from +1.23 V at bare GCE to +0.76 V at GCE/SWCNTs. Under the optimized experimental conditions, the linear range of the modified electrode to the concentration of L ‐tyrosine was 5.0×10?6–2.0×10?5 mol/L (R1=0.9952) and 2.7×10?5–2.6×10?4 mol/L (R2=0.9998) with a detection limit of 9.3×10?8 mol/L. The kinetic parameters such as α (charge transfer coefficient) and D (diffusion coefficient) were evaluated to be 0.66, 9.82×10?5 cm2 s?1, respectively. And the electrochemical mechanism of L ‐tyrosine was also discussed. |
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Keywords: | Single‐walled carbon nanotubes L‐Tyrosine Modified electrode Glassy carbon electrode |
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