Design of a Tea Polyphenols Concentration Detector for Tea Health Food Applications

• Published in: IEEE sensors journal Vol. 23; no. 21; pp. 26524 - 26530
• Main Authors: Chiang, Cheng-Ta, Huang, Zi-Xuan, Wu, Sheng-Min, Chen, Jyh-Cheng
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.11.2023; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Converter; Detectors; Error analysis; Frequency measurement; Green tea; health food; Natural & organic foods; Oscillators; Polyphenols; Relaxation oscillators; Resistors; Sensitivity; Sensors; tea; tea polyphenols; titration; Voltage
• ISSN: 1530-437X; 1558-1748
• DOI: 10.1109/JSEN.2023.3317591

In this work, a tea polyphenols concentration detector is proposed for tea health food applications innovatively. The proposed detector includes a tea polyphenols sensor and a converter that can convert tea polyphenols concentrations into a linear frequency output. Furthermore, the proposed converter designed as a multistage relaxation oscillator is to provide higher sensitivity for adaptive utilization in different tea polyphenols concentrations. The measured input range of the converter was 0.2-2.2 V, and the corresponding range of the frequency output was 3.639-18.14 MHz. The sensitivity was 7.25 MHz/V. The measured range of tea polyphenols concentrations was 0.6-<inline-formula> <tex-math notation="LaTeX">2.8\times 10^{-{3}} </tex-math></inline-formula> mol/L, and the frequency output was ranged from 8.79 to 13.11 MHz. A 0.27% of the measured maximum linear error was ensured. Finally, a test of green tea was successfully experimented. Confirmations through results, the tea polyphenols concentration detector could have normal functions for tea health food applications.