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      Capacidad de Discriminación de Dos Redes de Sensores como Unidades Sensibles de una Mini-Lengua Electrónica sobre Muestras de Leche Translated title: Ability of Discrimination of Two Sensor Networks as Sensitive Units of a Mini-Electronic Tongue on Milk Samples

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          Abstract

          En este artículo se presentan los resultados de discriminación de dos redes de sensores. Una de estas redes de sensores se conformó por electrodos comerciales serigrafiados con materiales electroactivos y la otra red de sensores se elaboró a partir de electrodos modificados con polipirrol y diferentes dopantes. Se analizó la capacidad de discriminación y clasificación de diferentes tipos de muestras de leche comercial. Los resultados muestran que el uso de sensores modificados con polipirrol permite obtener respuestas más completas en información, clasificando correctamente las muestras de leche con propiedades fisicoquímicas y organolépticas diferentes mediante el uso de dos componentes principales que reprodujo el 67,6% de la información. Por otra parte, la red de sensores comerciales se evaluó sobre el mismo grupo de muestras e iguales condiciones, consiguiéndose el 56,5% de la variabilidad de información, mostrando así menos capacidad de discriminación de las muestras analizadas.

          Translated abstract

          This paper presents the development of two sensor networks as initial stage for the design of a prototype electronic tongue. One of these sensor networks was joined by commercial screen printed electrodes and the other sensor network was assembled from modified electrodes with pyrrole and different dopants. The capacity of discrimination and classification of different types of samples of commercial milk to two sensor networks was analyzed. The results show that the use of modified sensors with conductive polymers allows obtaining more complete information, classifying correctly samples of milk with different organoleptic and physico-chemical properties by the use of two main components that reproduced the 67,6% of information. On the contrary, the commercial sensor network evaluated on the same group of samples and equal conditions, obtaining 56,5% of the variability of information, showing in this way lower classifying capacity of the samples analyzed.

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          Most cited references25

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          Determination of total polyphenol index in wines employing a voltammetric electronic tongue.

          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 (I(280)) 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).
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            Molecularly imprinted polymers as recognition materials for electronic tongues.

            For over three decades now, molecularly imprinted polymers (MIPs) have successfully been used for selective chemical sensing because the shape and size of their imprinted molecular cavities perfectly matched those of the target analyte molecules. Moreover, orientation of recognizing sites of these cavities corresponded to those of the binding sites of the template molecules. In contrast, electronic tongue (e-tongue) is usually an array of low-affinity recognition units. Its selectivity is based on recognition pattern or multivariate analysis. Merging these two sensing devices led to a synergetic hybrid sensor, an MIP based e-tongue. Fabrication of these e-tongues permitted simultaneous sensing and discriminating several analytes in complex solutions of many components so that these arrays compensated for limitation in cross-reactivity of MIPs. Apparently, analytical signals generated by MIP-based e-tongues, compared to those of ordinary sensor arrays, were more reliable where a unique pattern or 'fingerprint' for each analyte was generated. Additionally, several transduction platforms (from spectroscopic to electrochemical) engaged in constructing MIP-based e-tongues, found their broad and flexible applications. The present review critically evaluates achievements in recent developments of the MIP based e-tongues for chemosensing.
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              Beer discrimination using a portable electronic tongue based on screen-printed electrodes

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                infotec
                Información tecnológica
                Inf. tecnol.
                Centro de Información Tecnológica (La Serena, , Chile )
                0718-0764
                2017
                : 28
                : 5
                : 143-150
                Affiliations
                [01] Sincelejo orgnameUniversidad de Sucre orgdiv1Departamento de Biología y Química Colombia
                [02] Montería orgnameUniversidad Pontificia Bolivariana orgdiv1Laboratorio DANM Colombia
                [03] Cali orgnameUniversidad del Valle orgdiv1Facultad de Ciencias Naturales y Exactas orgdiv2Departamento de Química Colombia manuel.palencia@ 123456correounivalle.edu.co
                Article
                S0718-07642017000500015
                d601779c-f828-462c-adcd-9a6cc88ee718

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 25 April 2017
                : 06 March 2017
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 25, Pages: 8
                Product

                SciELO Chile


                pyrrole,screen-printed electrodes,conductive polymers,milk,electronic tongue,polipirrol,electrodos serigrafiados,sensores electroquímicos,leche,lengua electrónica

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