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Development of a voltammetric electronic tongue for discrimination of edible oils

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Abstract

In this paper, we propose a novel strategy to perform cyclic voltammetric measurements with a platinum microelectrode directly in edible oil samples. The microelectrode was employed as an electronic tongue that, along with the application of chemometrics to the current–potential responses, proved useful for discriminating oils on the basis of their quality and geographical origin. The method proposed here is based on the use of suitable room temperature ionic liquids, added to oils as supporting electrolytes to provide conductivity to the low-polarity samples. The entire voltammograms, recorded directly on the oil/RTIL mixtures, were processed via principal component analysis and a classification technique (K nearest neighbors), to extract information on samples characteristics. Data processing showed that oils having different nature (i.e. maize and olive) or geographical origin (i.e. olive oils coming from different regions) can be distinguished.

A novel strategy to perform voltammetric measurements with a platinum microelectrode directly in edible oil samples is presented. The microelectrode is employed as an electronic tongue that, along with the application of chemometrics to the voltammetric responses, allows oil discrimination according to their quality and geographical origin.

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Acknowledgments

The authors thank Dr. Alvise Perosa of the Department of Environmental Science, University of Venice, for kindly providing the pure [TETDP]+[decanoate]− ionic liquid. Financial support by the Ministry of University and Research (MUR) is also gratefully acknowledged.

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Authors and Affiliations

  1. Department of Pharmaceutical and Food Chemistry and Technology, University of Genoa, Via Brigata Salerno 13, 16147, Genoa, Italy

    Paolo Oliveri & Michele Forina

  2. Department of Physical Chemistry, University of Venice, Calle Larga S. Marta 2137, 30123, Venice, Italy

    M. Antonietta Baldo & Salvatore Daniele

Authors
  1. Paolo Oliveri
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  2. M. Antonietta Baldo
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  3. Salvatore Daniele
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  4. Michele Forina
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Correspondence to M. Antonietta Baldo.

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Oliveri, P., Baldo, M.A., Daniele, S. et al. Development of a voltammetric electronic tongue for discrimination of edible oils. Anal Bioanal Chem 395, 1135–1143 (2009). https://doi.org/10.1007/s00216-009-3070-8

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  • DOI: https://doi.org/10.1007/s00216-009-3070-8

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