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. 2018 Apr 24;6:131. doi: 10.3389/fchem.2018.00131

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Copyright © 2018 Garcia-Hernandez, Medina-Plaza, Garcia-Cabezon, Blanco, Fernandez-Escudero, Barajas-Tola, Rodriguez-Perez, Martin-Pedrosa and Rodriguez-Mendez.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Scores plot of the first two principal components of the PCA model calculated from voltammograms registered when electrodes were immersed in 1: Catechol, 2: Pyrogallol, 3: Vanillic acid and 4: Caffeic acid.