A colorimetric sensor for rapid discrimination of tea polyphenols and tea authentication based on Rh-decorated Pd nanocubes with high peroxidase-like activity

Jin Duan; Shiyu Xia; Xueqing Sang; Yuxin Chen; Haili Wei; Jinfang Nie; Guobao Xu; Yali Yuan; Wenxin Niu

doi:10.1016/j.talanta.2024.126209

A colorimetric sensor for rapid discrimination of tea polyphenols and tea authentication based on Rh-decorated Pd nanocubes with high peroxidase-like activity

Talanta. 2024 May 8:276:126209. doi: 10.1016/j.talanta.2024.126209. Online ahead of print.

Authors

Jin Duan¹, Shiyu Xia¹, Xueqing Sang², Yuxin Chen¹, Haili Wei¹, Jinfang Nie², Guobao Xu¹, Yali Yuan², Wenxin Niu³

Affiliations

¹ State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, PR China; School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, PR China.
² Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin, Guangxi, 541006, PR China.
³ State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, PR China; School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, PR China. Electronic address: niuwx@ciac.ac.cn.

PMID: 38728802
DOI: 10.1016/j.talanta.2024.126209

Abstract

The rapid development of nanozymes has offered substantial opportunities for the fields of biomedicine, chemical sensing, and food safety. Among these applications, multichannel sensors, with the capability of simultaneously detecting multiple target analytes, hold promise for the practical application of nanozymes in chemical sensing with high detection efficiency. In this study, Rh-decorated Pd nanocubes (Pd-Rh nanocubes) with significantly enhanced peroxidase-like activity are synthesized through the mediation of underpotential deposition (UPD) and subsequently employed to develop a multichannel colorimetric sensor for discriminating tea polyphenols (TPs) and tea authentication. Based on a single reactive unit of efficient catalytic oxidation of 3,3',5,5'-tetramethylbenzidine dihydrochloride (TMB), the nanozyme-based multichannel colorimetric sensor responds to each analyte in as short as 1 min. With the aid of principal component analysis (PCA) and hierarchical cluster analysis (HCA), various TPs and types of tea can be accurately identified. This work not only provides a new type of simply structured and highly active nanozymes but also develops a concise and rapid multichannel sensor for practical application in tea authentication and quality inspection.

Keywords: Colorimetric; Nanozymes; Pd–Rh nanocubes; Tea; Tea polyphenols.