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Electrochemical Sensor for the Quantification of Dopamine Using Glassy Carbon Electrodes Modified with Single‐Wall Carbon Nanotubes Covalently Functionalized with Polylysine |
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| Authors: | Alejandro Gutiérrez Aurélien Gasnier María L Pedano Jose Miguel Gonzalez‐Dominguez Alejandro Ansón‐Casaos Javier Hernández‐Ferrer Laura Galicia María D Rubianes María T Martínez Gustavo A Rivas |
| Institution: | 1. INFIQC, Departamento de Fisicoquímica, Facultad de Ciencias Químicas, Ciudad Universitaria, 5000 Córdoba, Argentina;2. Grupo de nanoestructuras de carbono y Nanotecnología, Departamento de Procesos Químicos y Nanotecnología, Instituto de Carboquímica, ICB‐CSIC, Miguel Luesma Castán 4, 50018 Zaragoza. Espa?a;3. Departamento de Química, Universidad Autónoma Metropolitana Iztapalapa, C.P. 09340, México |
| Abstract: | We report a dopamine electrochemical sensor based on the modification of glassy carbon electrodes (GCE) with polylysine‐functionalized single‐wall carbon nanotubes (SWCNT‐PLys). The resulting electrodes (GCE/SWCNT‐PLys) showed a significant improvement in the electrooxidation of dopamine with drastic decrease in the peak potentials separation and important enhancement in the associated currents. Dopamine was detected by differential pulse voltammetry‐adsorptive stripping with medium exchange at nanomolar levels even in the presence of high excess of ascorbic and uric acids. The sensor was successfully used for the quantification of dopamine in urine samples enriched with the neurotransmitter. |
| Keywords: | Covalently‐functionalized carbon nanotubes Glassy carbon Dopamine Polylysine |