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A composite sensor array impedentiometric electronic tongue Part I. Characterization.

G Pioggia1, F Di Francesco, A Marchetti

  • 1Interdepartmental Research Center E. Piaggio, Faculty of Engineering, University of Pisa, Italy. giovanni.pioggia@ing.unipi.it <giovanni.pioggia@ing.unipi.it>

Biosensors & Bioelectronics
|December 13, 2006
PubMed
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This study developed a composite sensor array for an electronic tongue, successfully characterizing five basic tastes across various concentrations. The system demonstrated sensitivity, selectivity, and stability for taste analysis.

Area of Science:

  • Materials Science
  • Chemical Sensing
  • Sensor Technology

Background:

  • Characterizing gustatory perceptions requires sophisticated analytical tools.
  • Composite sensor arrays offer potential for complex taste analysis.
  • Previous electronic tongue systems faced challenges in sensitivity and selectivity.

Purpose of the Study:

  • To characterize five compounds with diverse chemical properties and taste perceptions.
  • To evaluate the performance of a composite sensor array for taste analysis.
  • To assess the sensitivity, selectivity, and stability of the sensor system.

Main Methods:

  • Utilized a composite sensor array with five sensors based on carbon nanotubes, carbon black, and polythiophenes.
  • Measured electrical impedance variations at 150 Hz for different taste solutions.

Related Experiment Videos

  • Automated data acquisition involved a mechanical arm and rotating platform for sequential sensor dipping.

    • Main Results:

    • Analyzed 50 solutions representing the five basic tastes (salty, sour, sweet, umami, bitter) at 10 concentration levels.
    • Achieved high repeatability and robustness with over 100 measurements per sample over 4 months.
    • The impedentiometric composite sensor array demonstrated significant sensitivity and selectivity.

    Conclusions:

    • The developed impedentiometric composite sensor array is a sensitive, selective, and stable platform.
    • This technology shows promise for practical applications in electronic tongue systems.
    • The sensor array effectively distinguishes between different tastes and concentrations.