Citation: ZHOU Liang, CUI Yuan, HE Chun-Xiang. A Flexible and Integrated Electrochemical Sensor for Monitoring pH and Uric Acid in Sweat[J]. Chinese Journal of Analytical Chemistry, ;2020, 48(4): 516-522. doi: 10.19756/j.issn.0253-3820.191545 shu

A Flexible and Integrated Electrochemical Sensor for Monitoring pH and Uric Acid in Sweat

School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, China

Received Date: 9 September 2019
Revised Date: 25 February 2020

Fund Project: This work was supported by the National Natural Science Foundation of China (No.U1610114)

pH and uric acid (UA) flexible electrode were prepared by mixing carbon powder and luteolin or L-argining as functional selective reagents in a polyvinyl chloride (PVC) film for detection of pH value and UA concentration respectively. A flexible integrated electrochemical sensor (FIES) were designed, in which pH flexible electrode(pH/FE), UA flexible electrode (UA/FE), self-made thin film-gel model Ag/AgCl reference electrode and Pt wire electrode were placed on plastic film, then were embedded by a conduct film containing PVC-agar membrane saturated with KCl, the surface of the working electrode was exposed. Phosphate buffer solution (PBS) in the range of pH=2.00-8.00 was dripped on the surface of FIES, respectively, and the results showed that there was an oxidation peak on square wave voltammetry (SWV) curve when the pH/FE was used as work electrode. The peak potential was linear with the pH value of PBS. UA in PBS was dripped onto the surface of FIES, and its electrochemical behavior was studied by SWV when the UA/FE was used as working electrode. An oxidation peak was observed, and the peak current and UA concentration had a linear relationship in the range of 5.0×10^-6-1.3×10^-4 mol/L, and the detection limit was 2.0×10^-7 mol/L. FIES could be directly attached on the skin surface to determine the pH value of sweat and UA concentration.
- pH flexible electrode,
- Uric acid flexible electrode,
- Integration,
- Electrochemical sensors,
- Ticking type
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