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International Journal of Electrochemistry
Volume 2012 (2012), Article ID 986025, 11 pages
Review Article

Sensor Arrays and Electronic Tongue Systems

Sensores y Biosensores del Grupo, Departamento de Química, Universitat Autonoma de Barcelona, Bellaterra, 08193 Barcelona, Spain

Received 1 September 2011; Accepted 11 October 2011

Academic Editor: Thiago R. L. C. Paixão

Copyright © 2012 Manel del Valle. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper describes recent work performed with electronic tongue systems utilizing electrochemical sensors. The electronic tongues concept is a new trend in sensors that uses arrays of sensors together with chemometric tools to unravel the complex information generated. Initial contributions and also the most used variant employ conventional ion selective electrodes, in which it is named potentiometric electronic tongue. The second important variant is the one that employs voltammetry for its operation. As chemometric processing tool, the use of artificial neural networks as the preferred data processing variant will be described. The use of the sensor arrays inserted in flow injection or sequential injection systems will exemplify attempts made to automate the operation of electronic tongues. Significant use of biosensors, mainly enzyme-based, to form what is already named bioelectronic tongue will be also presented. Application examples will be illustrated with selected study cases from the Sensors and Biosensors Group at the Autonomous University of Barcelona.