Antioxidant identification using a colorimetric sensor array based on Co-N-C nanozyme.

Here we develop a simple and effective nose/tongue sensor array based on Co-N-C single-atom nanozymes-3,3',5,5'-tetramethylbenzidine (TMB)-HO for colorimetric discrimination of antioxidants, which makes use of the color reaction of TMB oxidation by HO in two different pH (3.8 and 4.6) environments under the catalysis of Co-N-C nanoenzyme with peroxidase-like activity.