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

• Published in: Talanta (Oxford) 2024-08, Vol.276, p.126209, Article 126209
• Main Authors: Duan, Jin, Xia, Shiyu, Sang, Xueqing, Chen, Yuxin, Wei, Haili, Nie, Jinfang, Xu, Guobao, Yuan, Yali, Niu, Wenxin
• Format: Article
• Language: English
• Subjects: Benzidines - chemistry; Catalysis; Colorimetric; Colorimetry - methods; Metal Nanoparticles - chemistry; Nanozymes; Oxidation-Reduction; Palladium - chemistry; Pd–Rh nanocubes; Peroxidase - chemistry; Polyphenols - analysis; Polyphenols - chemistry; Principal Component Analysis; Tea; Tea - chemistry; Tea polyphenols
• ISSN: 0039-9140; 1873-3573; 1873-3573
• DOI: 10.1016/j.talanta.2024.126209

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. [Display omitted] •Rh-decorated Pd nanocubes of high peroxidase-like activity are synthesized and employed in the construction of a concise and rapid sensor.•The nanozyme-based sensor succeeds to discriminate six tea polyphenols, the bioactive components of tea, and nine various real tea samples.•This work provides a promising strategy for tea authentication and quality inspection.