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Title: A voltammetric electronic tongue based on commercial screen-printed electrodes for the analysis of aminothiols by differential pulse voltammetry
Author: Pérez Ràfols, Clara
Gómez, Ana
Serrano i Plana, Núria
Díaz Cruz, José Manuel
Ariño Blasco, Cristina
Esteban i Cortada, Miquel
Keywords: Voltametria
Issue Date: Mar-2017
Publisher: Wiley-VCH
Abstract: A voltammetric electronic tongue has been designed as a proof of concept for the analysis of aminothiols by differential pulse voltammetry and has been tested in ternary mixtures of cysteine (Cys), homocysteine (hCys) and glutathione (GSH). It consists of three screen-printed electrodes of carbon, carbon nanofibers and gold cured at low temperature. A preliminary calibration study carried out separately for each aminothiol confirmed that, working at an optimal pH value of 7.4, every electrode produces differentiated responses for every analyte (cross-response). As for the tongue, it was applied to calibration and validation mixtures of Cys, hCys and GSH and provided voltammograms that, baseline-corrected, normalized and combined in different ways were submitted to partial least squares (PLS) calibration. The calibration models produced good predictions of the concentrations of all three analytes, which suggest that the proposed voltammetric tongue improves the performance of a previous design based on linear sweep voltammetric measurements under acidic conditions.
Note: Versió postprint del document publicat a:
It is part of: Electroanalysis, 2017, vol. 29, p. 1559 -1565
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ISSN: 1040-0397
Appears in Collections:Articles publicats en revistes (Enginyeria Química i Química Analítica)

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