Per citar aquest document: http://ddd.uab.cat/record/154796
Determination of total polyphenol index in wines employing a voltammetric electronic tongue
Cetó Alsedà, Xavier (Universitat Autònoma de Barcelona. Grup de Sensors i Biosensors)
Gutiérrez, Juan Manuel (Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional. Department of Electrical Engineering)
Gutiérrez, Manuel (Institut de Microelectrònica de Barcelona)
Céspedes Mulero, Francisco (Universitat Autònoma de Barcelona. Grup de Sensors i Biosensors)
Capdevila, Josefina (Institut Català de la Vinya i el Vi. Estació de Viticultura i Enologia)
Minguez, Santiago (Institut Català de la Vinya i el Vi. Estació de Viticultura i Enologia)
Jiménez Jorquera, Cecília (Institut de Microelectrònica de Barcelona)
Valle Zafra, Manuel del (Universitat Autònoma de Barcelona. Grup de Sensors i Biosensors)

Data: 2012
Resum: This work reports the application of a voltammetric electronic tongue system (ET) made from an array of modified graphite-epoxy composites plus a gold microelectrode in the qualitative and quantitative analysis of polyphenols found in wine. Wine samples were analyzed using cyclic voltammetry without any sample pretreatment. The obtained responses were preprocessed employing discrete wavelet transform (DWT) in order to compress and extract significant features from the voltammetric signals, and the obtained approximation coefficients fed a multivariate calibration method (artificial neural network-ANN-or partial least squares-PLS-) which accomplished the quantification of total polyphenol content. External test subset samples results were compared with the ones obtained with the Folin–Ciocalteu (FC) method and UV absorbance polyphenol index (I₂₈₀) as reference values, with highly significant correlation coefficients of 0. 979 and 0. 963 in the range from 50 to 2400 mg L⁻¹ gallic acid equivalents, respectively. In a separate experiment, qualitative discrimination of different polyphenols found in wine was also assessed by principal component analysis (PCA).
Nota: Número d'acord de subvenció MCINN/TEC2007-68012-C03
Nota: Número d'acord de subvenció MCINN/CTQ2010-17099
Drets: Tots els drets reservats.
Llengua: Anglès
Document: article ; recerca ; submittedVersion
Matèria: Voltammetric sensors ; Electronic tongue ; Artificial neural network ; Wine analysis ; Folin–Ciocalteu ; Polyphenol
Publicat a: Analytica chimica acta, Vol. 732 (Jun 2012) , p. 172-179, ISSN 0003-2670

DOI: 10.1016/j.aca.2012.02.026


28 p, 2.1 MB

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