An electrochemiluminescence sensor based on CsPbBr3 -zquantum dots and poly (3-thiophene acetic acid) cross-linked nanogold imprinted layer for the determination of benzo(a)pyrene in edible oils

Hai Chi; Lei Wang; Shuo Wang; Guoqin Liu

doi:10.1016/j.foodchem.2023.136508

An electrochemiluminescence sensor based on CsPbBr₃ -zquantum dots and poly (3-thiophene acetic acid) cross-linked nanogold imprinted layer for the determination of benzo(a)pyrene in edible oils

Food Chem. 2023 Nov 15:426:136508. doi: 10.1016/j.foodchem.2023.136508. Epub 2023 Jun 3.

Authors

Hai Chi¹, Lei Wang¹, Shuo Wang¹, Guoqin Liu²

Affiliations

¹ School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China.
² 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: 37348399
DOI: 10.1016/j.foodchem.2023.136508

Abstract

A novel quench molecularly imprinted electrochemiluminescence sensor (MIECLS) based on a covalent organic framework composite (COF-300-Au) with enhanced electrochemiluminescence (ECL) signal from CsPbBr₃ quantum dots and cross-linked 3-thiopheneacetic acid functionalized AuNPs (3-TAA@AuNPs) was developed for the detection of the environmental pollutant benzo(a)pyrene (BaP). A composite material constructed of COF-300-Au with a large specific surface area served as the sensor's support substrate, providing more CsPbBr₃ and imprint recognition sites. Electropolymerization was then employed to form an AuNPs three-dimensional imprinting layer with polythiophene cross-linked using BaP as a template and 3-TAA@AuNPs as a functional monomer. A specific cross-linked imprinting recognition effect was recorded on BaP along with the quenching effect of quinones. The density functional theory (DFT) evaluation of the binding mechanism between 3-TAA@AuNPs and BaP revealed powerful MIECLS toward the detection of BaP at concentrations ranging from 10^-14 to 10^-5M, with a detection limit of as low as 4.1 × 10^-15 M.

Keywords: 3-thiopheneacetic acid functionalized AuNPs; Covalent organic framework composites; Electropolymerization; Molecularly imprinted.

MeSH terms

Benzo(a)pyrene
Electrochemical Techniques / methods
Gold
Limit of Detection
Metal Nanoparticles*
Molecular Imprinting* / methods
Oils

Substances

3-thiophene acetic acid
Benzo(a)pyrene
Gold
Oils