An electrochemical sensor based on electrochemically activated carbon cloth and poly (o-aminothiophenol) cross-linked nanogold imprinted layer for the determination of tert-butylhydroquinone

Hai Chi; Chong Yang; Guoqin Liu

doi:10.1016/j.foodchem.2024.139548

An electrochemical sensor based on electrochemically activated carbon cloth and poly (o-aminothiophenol) cross-linked nanogold imprinted layer for the determination of tert-butylhydroquinone

Food Chem. 2024 May 6:452:139548. doi: 10.1016/j.foodchem.2024.139548. Online ahead of print.

Authors

Hai Chi¹, Chong Yang², Guoqin Liu³

Affiliations

¹ College of Food and Bioengineering, Xihua University, Chengdu 610039, China.
² Inspection and Testing Institute of Eryuan County in Dali Prefecture of Yunnan Province, Yunnan Eryuan 671208, China.
³ School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China; Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, South China University of Technology, Guangzhou 510640, China. Electronic address: guoqin@scut.edu.cn.

PMID: 38728894
DOI: 10.1016/j.foodchem.2024.139548

Abstract

In this study, an electrochemical sensor based on MoS₂ with enhanced electrochemical signals from electrochemically activated carbon cloth (EACC) electrodes and cross-linked o-aminothiophenol functionalized AuNPs (o-ATP@AuNPs) was developed for the detection of the unsaturated vegetable oil antioxidant tert-butylhydroquinone (TBHQ). In this approach, carbon cloth is activated through the implementation of electrochemical methods, thereby effectively increasing its specific surface area. The resulting EACC, serving as an electrode substrate, enables the growth of additional nanomaterials and enhances conductivity. The incorporation of MoS₂ effectively augments the sensitivity of the electrochemical sensor. Subsequently, MIP/MoS₂/EMCC is formed via electropolymerization, utilizing TBHQ as the template molecule and o-ATP@AuNPs as the functional monomer. The SS bond of o-ATP ensures a strong and stable connection between MoS₂ and o-ATP@AuNPs, thereby facilitating the immobilization of MIP. In addition, the high conductivity possessed by o-ATP@AuNPs could effectively improve the sensitivity of the electrochemical sensor. Under the optimal conditions, MIP/MoS₂/EMCC could determine TBHQ in the range of 1 × 10^-3 μM to 120 μM by differential pulse voltammetry (DPV) with a detection line of 0.72 nM. The proposed MIP/MoS₂/EMCC is expected to be applied in the future for the selective and sensitive detection of TBHQ in vegetable oils.

Keywords: Electrochemical sensor; Electrochemically activated carbon cloth; O-aminothiophenol functionalized AuNPs; Tert-butylhydroquinone.