Modified electrode using multi-walled carbon nanotubes and a metallopolymer for amperometric detection of l-cysteine

•New hybrid material with redox active sites formed at low overpotential.•Easy and simple electrode modification with no activation step.•High electrocatalytic constant toward cysteine electro-oxidation at pH 7.0. This work describes for the first time the modification of a glassy carbon electrode w...

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Bibliographic Details
Published in:Electrochimica acta 2013-12, Vol.113, p.332-339
Main Authors: Corrêa, Cátia Crispilho, Jannuzzi, Sergio Augusto Venturinelli, Santhiago, Murilo, Timm, Ronaldo Adriano, Formiga, André Luiz Barboza, Kubota, Lauro Tatsuo
Format: Article
Language:English
Subjects:
Anodizing
Chemical reactions
Cysteine
Dispersions
Electrodes
Glassy carbon
l-Cysteine detection
Mathematical analysis
Metallopolymer
Multi wall carbon nanotubes
MWCNTs
Poly(4-vinylpyridine)
Sensors
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Summary:•New hybrid material with redox active sites formed at low overpotential.•Easy and simple electrode modification with no activation step.•High electrocatalytic constant toward cysteine electro-oxidation at pH 7.0. This work describes for the first time the modification of a glassy carbon electrode with a hybrid material formed by the dispersion of multi-walled carbon nanotubes in the metallopolymer P4VP-Fe(CN)5. The reversible redox couple of the material was formed at relatively low overpotential and showed a good electrocatalytic activity toward cysteine electrooxidation. The cathodic shift of the oxidation process for the modified electrode was 500mV compared to the bare glassy carbon electrode. The rate constant (kobs) for the chemical reaction between the redox mediator and cysteine was found to be 8.95×103Lmol−1s−1. The analytical curve was found to be linear from 20.5 up to 151nmolL−1, with a sensitivity of 0.996nALnmol−1 and response time of 0.1s.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2013.09.050