Catalase immobilized ZnO nanorod with β-cyclodextrin functionalization for electrochemical determination of forchlorfenuron

Abstract

In this communication, we demonstrated a forchlorfenuron (FF) electrochemical biosensor based on a catalase immobilized ZnO nanorod with β-cyclodextrin functionalization (CA-β-CD-ZnO). CA was immobilized on the β-CD functionalized ZnO rods. The prepared CA-β-CD-ZnO was highly sensitive to the electrochemical reduction of H2O2. After introduction of FF into the H2O2 electrochemical detection system, the current change had a linear relationship with the FF concentration. Investigation showed the CA-β-CD-ZnO could be used for detecting FF in the concentration range between 0.005 to 2 μM with a low detection limit of 0.002 μM. Moreover, the CA-β-CD-ZnO was successfully demonstrated for FF detection in fruit samples.