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

Khan MR, Kang SW - Sensors (Basel) (2015)

Bottom Line: The proposed IDC taste sensor array was compared with the potentiometric taste sensor with respect to sensitivity, dynamic range width, linearity and response time.We found that the proposed IDC sensor array has better performance.Finally, principal component analysis (PCA) was applied to discriminate different types of taste of the mixed taste substances.

View Article: PubMed Central - PubMed

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

ABSTRACT
In this study, we designed and developed an interdigitated capacitor (IDC)-based taste sensor array to detect different taste substances. The designed taste sensing array has four IDC sensing elements. The four IDC taste sensing elements of the array are fabricated by incorporating four different types of lipids into the polymer, dioctyl phenylphosphonate (DOPP) and tetrahydrofuran (THF) to make the respective dielectric materials that are individually placed onto an interdigitated electrode (IDE) via spin coating. When the dielectric material of an IDC sensing element comes into contact with a taste substance, its dielectric properties change with the capacitance of the IDC sensing element; this, in turn, changes the voltage across the IDC, as well as the output voltage of each channel of the system. In order to assess the effectiveness of the sensing system, four taste substances, namely sourness (HCl), saltiness (NaCl), sweetness (glucose) and bitterness (quinine-HCl), were tested. The IDC taste sensor array had rapid response and recovery times of about 12.9 s and 13.39 s, respectively, with highly stable response properties. The response property of the proposed IDC taste sensor array was linear, and its correlation coefficient R2 was about 0.9958 over the dynamic range of the taste sensor array as the taste substance concentration was varied from 1 μM to 1 M. The proposed IDC taste sensor array has several other advantages, such as real-time monitoring capabilities, high sensitivity 45.78 mV/decade, good reproducibility with a standard deviation of about 0.029 and compactness, and the circuitry is based on readily available and inexpensive electronic components. The proposed IDC taste sensor array was compared with the potentiometric taste sensor with respect to sensitivity, dynamic range width, linearity and response time. We found that the proposed IDC sensor array has better performance. Finally, principal component analysis (PCA) was applied to discriminate different types of taste of the mixed taste substances.

No MeSH data available.


Experimental setup of the IDC array taste sensing system: (a) schematic diagram of the taste sensing system; and (b) photograph of the different parts of the IDC sensor array.
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sensors-15-13201-f006: Experimental setup of the IDC array taste sensing system: (a) schematic diagram of the taste sensing system; and (b) photograph of the different parts of the IDC sensor array.

Mentions: A schematic diagram of the proposed interdigitated taste sensing system for the characterization of different taste substances is shown in Figure 6. It consists of a test chamber, four interdigitated taste sensing elements, one reference IDC element, a signal processing unit, an oscilloscope (TDS3032B, Tektronix, Wilsonville, OR, USA), a multifunction data acquisition (DAQ) module (NI USB-6216 BNC, National Instruments, Debrecen, Hungary) and a PC. The signal processing unit is primarily divided into five parts: an oscillator, buffer amplifier, constant current generator, amplifier, and peak detector [49,50,51]. We designed all electronic circuits of the taste sensing system to use readily available and inexpensive electronic components.


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

Khan MR, Kang SW - Sensors (Basel) (2015)

Experimental setup of the IDC array taste sensing system: (a) schematic diagram of the taste sensing system; and (b) photograph of the different parts of the IDC sensor array.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4507581&req=5

sensors-15-13201-f006: Experimental setup of the IDC array taste sensing system: (a) schematic diagram of the taste sensing system; and (b) photograph of the different parts of the IDC sensor array.
Mentions: A schematic diagram of the proposed interdigitated taste sensing system for the characterization of different taste substances is shown in Figure 6. It consists of a test chamber, four interdigitated taste sensing elements, one reference IDC element, a signal processing unit, an oscilloscope (TDS3032B, Tektronix, Wilsonville, OR, USA), a multifunction data acquisition (DAQ) module (NI USB-6216 BNC, National Instruments, Debrecen, Hungary) and a PC. The signal processing unit is primarily divided into five parts: an oscillator, buffer amplifier, constant current generator, amplifier, and peak detector [49,50,51]. We designed all electronic circuits of the taste sensing system to use readily available and inexpensive electronic components.

Bottom Line: The proposed IDC taste sensor array was compared with the potentiometric taste sensor with respect to sensitivity, dynamic range width, linearity and response time.We found that the proposed IDC sensor array has better performance.Finally, principal component analysis (PCA) was applied to discriminate different types of taste of the mixed taste substances.

View Article: PubMed Central - PubMed

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

ABSTRACT
In this study, we designed and developed an interdigitated capacitor (IDC)-based taste sensor array to detect different taste substances. The designed taste sensing array has four IDC sensing elements. The four IDC taste sensing elements of the array are fabricated by incorporating four different types of lipids into the polymer, dioctyl phenylphosphonate (DOPP) and tetrahydrofuran (THF) to make the respective dielectric materials that are individually placed onto an interdigitated electrode (IDE) via spin coating. When the dielectric material of an IDC sensing element comes into contact with a taste substance, its dielectric properties change with the capacitance of the IDC sensing element; this, in turn, changes the voltage across the IDC, as well as the output voltage of each channel of the system. In order to assess the effectiveness of the sensing system, four taste substances, namely sourness (HCl), saltiness (NaCl), sweetness (glucose) and bitterness (quinine-HCl), were tested. The IDC taste sensor array had rapid response and recovery times of about 12.9 s and 13.39 s, respectively, with highly stable response properties. The response property of the proposed IDC taste sensor array was linear, and its correlation coefficient R2 was about 0.9958 over the dynamic range of the taste sensor array as the taste substance concentration was varied from 1 μM to 1 M. The proposed IDC taste sensor array has several other advantages, such as real-time monitoring capabilities, high sensitivity 45.78 mV/decade, good reproducibility with a standard deviation of about 0.029 and compactness, and the circuitry is based on readily available and inexpensive electronic components. The proposed IDC taste sensor array was compared with the potentiometric taste sensor with respect to sensitivity, dynamic range width, linearity and response time. We found that the proposed IDC sensor array has better performance. Finally, principal component analysis (PCA) was applied to discriminate different types of taste of the mixed taste substances.

No MeSH data available.