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Highly Sensitive Multi-Channel IDC Sensor Array for Low Concentration Taste Detection.

Md Rajibur Rahaman Khan1, Shin-Won Kang2

  • 1School of Electronics Engineering, Kyungpook National University, 1370 Sankyuk-Dong, Bukgu, Daegu 702-701, Korea. rajibur@ee.knu.ac.kr.

Sensors (Basel, Switzerland)
|June 10, 2015
PubMed
Summary

A novel interdigitated capacitor (IDC)-based taste sensor array was developed for detecting taste substances. This electronic tongue offers rapid, stable, and sensitive detection, outperforming traditional taste sensors.

Keywords:
dielectric constantinterdigitated capacitorprincipal component analysistaste sensor array

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Area of Science:

  • Materials Science
  • Chemical Sensing
  • Electronic Engineering

Background:

  • Traditional taste sensors face limitations in sensitivity and response time.
  • Developing advanced electronic tongues is crucial for accurate taste analysis.

Purpose of the Study:

  • To design and develop a novel interdigitated capacitor (IDC)-based taste sensor array.
  • To evaluate the performance of the IDC taste sensor array for detecting various taste substances.

Main Methods:

  • Fabrication of four IDC sensing elements using different lipid-polymer dielectric materials.
  • Incorporation of dioctyl phenylphosphonate (DOPP) and tetrahydrofuran (THF) for dielectric properties.
  • Testing with sourness (HCl), saltiness (NaCl), sweetness (glucose), and bitterness (quinine-HCl).

Main Results:

  • The IDC taste sensor array demonstrated rapid response (12.9 s) and recovery (13.39 s) times.
  • Achieved high linearity (R² ≈ 0.9958) and sensitivity (45.78 mV/decade) over a wide dynamic range (1 μM to 1 M).
  • Showcased excellent reproducibility (SD ≈ 0.029), stability, and real-time monitoring capabilities.

Conclusions:

  • The proposed IDC taste sensor array offers superior performance compared to potentiometric taste sensors.
  • Principal Component Analysis (PCA) effectively discriminated between mixed taste substances.
  • This technology holds promise for advanced taste sensing applications.