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Pàgina inicial > Articles > Articles publicats > Determination of total polyphenol index in wines employing a voltammetric electronic tongue |
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). |
Ajuts: | Ministerio de Ciencia e Innovación TEC2007-68012-C03 Ministerio de Ciencia e Innovación CTQ2010-17099 |
Drets: | Tots els drets reservats. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió sotmesa a revisió |
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 1873-4324 |
Pre-print 28 p, 2.1 MB |