Analytical applications of glassy carbon electrodes modified with multi-wall carbon nanotubes dispersed in polyethylenimine as detectors in flow systems

2007 ◽  
Vol 596 (2) ◽  
pp. 183-194 ◽  
Author(s):  
Alberto Sánchez Arribas ◽  
Esperanza Bermejo ◽  
Manuel Chicharro ◽  
Antonio Zapardiel ◽  
Guillermina L. Luque ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Glassy Carbon ◽  
Carbon Electrodes ◽  
Glassy Carbon Electrodes ◽  
Multi Wall Carbon Nanotubes ◽  
Analytical Applications ◽  
Flow Systems

scholarly journals Highly Selective Determination of Dopamine in the Presence of Ascorbic Acid and Serotonin at Glassy Carbon Electrodes Modified with Carbon Nanotubes Dispersed in Polyethylenimine

2008 ◽  
Vol 8 (11) ◽  
pp. 6003-6009 ◽  
Author(s):  
Marcela C. Rodríguez ◽  
María D. Rubianes ◽  
Gustavo A. Rivas
Keyword(s):  
Carbon Nanotubes ◽  
Ascorbic Acid ◽  
Glassy Carbon ◽  
Carbon Electrodes ◽  
Acid Oxidation ◽  
Promising Alternative ◽  
Glassy Carbon Electrodes ◽  
Multi Wall Carbon Nanotubes ◽  
Selective Determination

We report the highly selective and sensitive voltammetric dopamine quantification in the presence of ascorbic acid and serotonin by using glassy carbon electrodes modified with a dispersion of multi-wall carbon nanotubes (MWCNT) in polyethylenimine, PEI (GCE/MWCNT-PEI). The electrocatalytic activity of the MWCNT deposited on the glassy carbon electrode has allowed an important decrease in the overvoltages for the oxidation of ascorbic acid and dopamine, making possible a clear definition of dopamine, serotonin and ascorbic acid oxidation processes. The sensitivities for dopamine in the presence and absence of 1.0 mM ascorbic acid and serotonin were (2.18±0.03 × 105 μAM−1 (r = 0.9998); and (2.10±0.07 × 105 μAM−1 (r = 0.9985), respectively, demonstrating the excellent performance of the GCE/MWCNT-PEI. The detection limit for dopamine in the mixture was 9.2 × 10−7 M. The R. S. D. for the determination of 50 μM dopamine using four different electrodes was 3.9% when modified with the same MWCNT/PEI dispersion, and 4.6% when using four different dispersions. The modified electrode has been successfully applied for recovery assays of dopamine in human blood serum. Therefore, the new sensor represents an interesting and promising alternative for the electrochemical quantification of neurotransmitters and other analytes of clinical interest.

Determination of butylparaben by adsorptive stripping voltammetry at glassy carbon electrodes modified with multi-wall carbon nanotubes

2013 ◽  
Vol 110 ◽  
pp. 510-516 ◽  
Author(s):  
María Ángeles Lorenzo ◽  
Alberto Sánchez Arribas ◽  
Mónica Moreno ◽  
Esperanza Bermejo ◽  
Manuel Chicharro ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Glassy Carbon ◽  
Stripping Voltammetry ◽  
Adsorptive Stripping Voltammetry ◽  
Carbon Electrodes ◽  
Glassy Carbon Electrodes ◽  
Multi Wall Carbon Nanotubes
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