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Voltammetric Sensor Based on Molecularly Imprinted Chitosan-Carbon Nanotubes Decorated with Gold Nanoparticles Nanocomposite Deposited on Boron-Doped Diamond Electrodes for Catechol Detection

1
Institute of Analytical Sciences UMR CNRS-UCBL-ENS 5280, University of Lyon, 69100 Villeurbanne, France
2
Group UVASens. Dpt. Inorganic Chemistry, Engineers School, University of Valladolid, 47011 Valladolid, Spain
3
BioecoUVA Institute, University of Valladolid, 47011 Valladolid, Spain
4
University of Toulon, AMU, CNRS, IM2NP, CS 60584, CEDEX 9, F-83041 Toulon, France
*
Authors to whom correspondence should be addressed.
Materials 2020, 13(3), 688; https://doi.org/10.3390/ma13030688
Received: 26 December 2019 / Revised: 29 January 2020 / Accepted: 31 January 2020 / Published: 4 February 2020
(This article belongs to the Special Issue Advanced Biochemical Sensors: Materials Research and Application)
Phenolic compounds such as catechol are present in a wide variety of foods and beverages; they are of great importance due to their antioxidant properties. This research presents the development of a sensitive and biocompatible molecular imprinted sensor for the electrochemical detection of catechol, based on natural biopolymer-electroactive nanocomposites. Gold nanoparticle (AuNP)-decorated multiwalled carbon nanotubes (MWCNT) have been encapsulated in a polymeric chitosan (CS) matrix. This chitosan nanocomposite has been used to develop a molecular imprinted polymers (MIP) in the presence of catechol on a boron-doped diamond (BDD) electrode. The structure of the decorated MWCNT has been studied by TEM, whereas the characterization of the sensor surface has been imaged by AFM, demonstrating the satisfactory adsorption of the film and the adequate coverage of the decorated carbon nanotubes on the electrode surface. The electrochemical response of the sensor has been analyzed by cyclic voltammetry (CV) where excellent reproducibility and repeatability to catechol detection in the range of 0 to 1 mM has been found, with a detection limit of 3.7 × 10−5 M. Finally, the developed sensor was used to detect catechol in a real wine sample. View Full-Text
Keywords: molecular imprinted polymer; electrochemical sensor; catechol; chitosan; BDD electrode molecular imprinted polymer; electrochemical sensor; catechol; chitosan; BDD electrode
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Salvo-Comino, C.; Rassas, I.; Minot, S.; Bessueille, F.; Arab, M.; Chevallier, V.; Rodriguez-Mendez, M.L.; Errachid, A.; Jaffrezic-Renault, N. Voltammetric Sensor Based on Molecularly Imprinted Chitosan-Carbon Nanotubes Decorated with Gold Nanoparticles Nanocomposite Deposited on Boron-Doped Diamond Electrodes for Catechol Detection. Materials 2020, 13, 688.

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