Analytical Sciences

Sensitive Electrochemical Capsaicin Sensor Based on a Screen Printed Electrode Modified with Poly(sodium 4-styrenesulfonate) Functionalized Graphite

Yan WANG,* Bin-Bin HUANG,* Wan-Lin DAI,* Bin XU,** Tian-Liang WU,** Jia-Ping YE,*** and Jian-Shan YE*

*College of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, P. R. China
**Hainan Institute for Food Control, No. 9, Yaogu Yi Road, Xiu Ying District, Haikou 570311, P. R. China
***Guangzhou Ingsens Sensor Technology Co., Ltd., Guangzhou 510535, P. R. China

A sensitive capsaicin sensor was constructed based on a poly(sodium 4-styrenesulfonate) functionalized graphite modified screen printed electrode (PSS-Grp/SPE) in this study. The PSS-Grp and poly(diallyldimethylammonium chloride) functionalized graphite (PDDA-Grp) were easily synthesized by interacting Grp with PSS and PDDA through sonication, and resulted in negative and with positive charges on the surface, respectively. The prepared PSS-Grp and PDDA-Grp were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and ultraviolet and visible spectroscopy (UV-vis). The electrochemical performance of PSS-Grp in a 50 μM capsaicin solution presented a current density of 33 μA cm⁻², which was much higher than the PDDA-Grp of 1.5 μA cm⁻². Our study showed that capsaicin could interact better with strong negative charges on the PSS-Grp/SPE surface to give a higher electrochemical response. The direct electrochemical sensing of capsaicin was achieved at PSS-Grp/SPE using differential pulse stripping voltammetry (DPSV) under the optimized conditions.

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