title: A High Sensitivity IDC-Electronic Tongue Using Dielectric/Sensing Membranes with Solvatochromic Dyes.
abstract: In this paper, an electronic tongue/taste sensor array containing different interdigitated capacitor (IDC) sensing elements to detect different types of tastes, such as sweetness (glucose), saltiness (NaCl), sourness (HCl), bitterness (quinine-HCl), and umami (monosodium glutamate) is proposed. We present for the first time an IDC electronic tongue using sensing membranes containing solvatochromic dyes. The proposed highly sensitive (30.64 mV/decade sensitivity) IDC electronic tongue has fast response and recovery times of about 6 s and 5 s, respectively, with extremely stable responses, and is capable of linear sensing performance (R² ≈ 0.985 correlation coefficient) over the wide dynamic range of 1 µM to 1 M. The designed IDC electronic tongue offers excellent reproducibility, with a relative standard deviation (RSD) of about 0.029. The proposed device was found to have better sensing performance than potentiometric-, cascoded compatible lateral bipolar transistor (C-CLBT)-, Electronic Tongue (SA402)-, and fiber-optic-based taste sensing systems in what concerns dynamic range width, response time, sensitivity, and linearity. Finally, we applied principal component analysis (PCA) to distinguish between various kinds of taste in mixed taste compounds.
authors.affiliation: School of Electronics Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea. rajibur@ee.knu.ac.kr.
authors.forename: Md Rajibur Rahaman
authors.initials: MR
authors.lastname: Khan
authors.affiliation: School of Electronics Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea. alireza.khalilian991@gmail.com.
authors.forename: Alireza
authors.initials: A
authors.lastname: Khalilian
authors.affiliation: School of Electronics Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea. swkang@knu.ac.kr.
authors.forename: Shin-Won
authors.initials: SW
authors.lastname: Kang
mesh_terms: D004396:Coloring Agents; D062609:Electronic Nose; D005947:Glucose; D015203:Reproducibility of Results; D013649:Taste; D014059:Tongue
chemical_list: D004396:Coloring Agents; D005947:Glucose
keywords: dielectric constant; electronic tongue; interdigitated capacitor; response time; sensing element; sensing membrane; solvatochromic dye