Peroxidase-Like FeCoZn Triple-Atom Catalyst-Based Electronic Tongue for Colorimetric Discrimination of Food Preservatives *.
Heng LiMengru SunHongfei GuJuan HuangGuo WangRenjian TanRufen WuXinyu ZhangShuhu LiuLirong ZhengWenxing ChenZhengbo ChenPublished in: Small (Weinheim an der Bergstrasse, Germany) (2023)
Recently, single-atom catalysts are attracting much attention in sensor field due to their remarkable peroxidase- or oxidase-like activities. Herein, peroxidase-like FeCoZn triple-atom catalyst supported on S- and N-doped carbon derived from ZIF-8 (FeCoZn-TAC/SNC) serves as a proof-of-concept nanozyme. In this paper, a dual-channel nanozyme-based colorimetric sensor array is presented for identifying seven preservatives in food. Further experiments reveal that the peroxidase-like activity of the FeCoZn TAzyme enables it to catalyze the oxidation of 3,3',5,5'-tetramethylbenzidine (TMB) and o-phenylenediamine (OPD) in the presence of H 2 O 2 , yielding the blue oxTMB and yellow oxOPD, respectively. However, food preservatives are adsorbed on the nanozyme surface through π-π stacking interaction and hydrogen bond, and the reduction in catalytic activity of FeCoZn TAzyme causes differential colorimetric signal variations, which provide unique "fingerprints" for each food preservative.
Keyphrases
- hydrogen peroxide
- gold nanoparticles
- highly efficient
- nitric oxide
- molecular dynamics
- metal organic framework
- visible light
- human health
- fluorescent probe
- sensitive detection
- room temperature
- electron transfer
- reduced graphene oxide
- ionic liquid
- quantum dots
- living cells
- risk assessment
- gene expression
- high resolution
- high throughput
- dna methylation