A single-site porphyrin (Cu)-based COF electrocatalyst for the electrochemical detection of gallic acid sensitively

Mei-Jie Wei; Jing Li; Ze-Qi Wei; Sheng-Feng Zhang; Zhong-Xia Wang; Heng-Ye Li; Rui Zhang; Fen-Ying Kong; Wei Wang

doi:10.1016/j.aca.2023.341975

A single-site porphyrin (Cu)-based COF electrocatalyst for the electrochemical detection of gallic acid sensitively

Anal Chim Acta. 2023 Dec 1:1283:341975. doi: 10.1016/j.aca.2023.341975. Epub 2023 Oct 29.

Authors

Mei-Jie Wei¹, Jing Li¹, Ze-Qi Wei¹, Sheng-Feng Zhang¹, Zhong-Xia Wang¹, Heng-Ye Li¹, Rui Zhang¹, Fen-Ying Kong², Wei Wang³

Affiliations

¹ School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, 224051, China.
² School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, 224051, China. Electronic address: kongfy@ycit.edu.cn.
³ School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, 224051, China. Electronic address: wangw@ycit.edu.cn.

PMID: 37977793
DOI: 10.1016/j.aca.2023.341975

Abstract

Sensitive and convenient determination of gallic acid (GA) is vital for food safety. Here, a novel porphyrin (Cu)-based covalent organic framework named as COF(Cu) was successfully synthesized by condensing pre-metalated 5,10,15,20-tetrakis (para-aminophenyl) porphyrin copper (II) and 2,3,6,7-tetra (4-formylphenyl) tetrathiafulvalene ligands. By combining the advantages of porphyrin with tetrathiafulvalene, it may be possible to create a COF with an intrinsically effective charge-transfer channel. In addition, the Cu-N₄ type in the COF(Cu) can be regarded as the single-site electrocatalyst. Benefiting from these advantages, the COF(Cu) based electrochemical sensor demonstrated outstanding response to gallic acid (GA). Under the optimal conditions by square wave voltammetry technique, the COF(Cu) modified electrode showed a wide linear range (0.01-1000 μM), a low detection limit (2.81 nM), good reproducibility, acceptable selectivity as well as high stability. Moreover, the established approach was adopted to detect GA in real tea samples with good recoveries, indicating that the COF(Cu) based electrochemical sensor may pave the way for the application in food analysis.

Keywords: Covalent organic framework; Electrochemical sensing; Food analysis; Gallic acid; Single-site catalyst.