Noncovalent Assembly of Picket‐Fence Porphyrin on Carbon Nanotubes as Effective Peroxidase‐Like Catalysts for Detection of Hydrogen Peroxide in Beverages

A newly developed electrochemical sensor for determination of hydrogen peroxide (H₂O₂) in beverages using a water‐insoluble picket‐fence porphyrin (FeTpivPP) functionalized multiwalled carbon nanotubes (MWNTs) is demonstrated. Introduction of FeTpivPP on MWNTs led to enhanced electron transfer. As a new platform in electrochemical analysis, the resultant sensor showed excellent electrocatalytic activity toward the reduction of H₂O₂ due to the synergic effect between MWNTs and FeTpivPP, thus leading to highly sensitive amperometric sensing of H₂O₂ with a detection limit of 0.05 µmol L^?1. The developed method is successfully used to detect H₂O₂ in beverages and shows great promise for routine sensing applications.