Amino Acid-Functionalized Electrochemically Reduced Graphene Oxide-Modified Glassy Carbon Electrodes for the Efficient Sensing of Nitrite

摘要

In this work, different structures of amino acid-functionalized electrochemically reduced grapheneoxide-modified glassy carbon electrodes (ERGO/GCEs) were developed and applied for thedetermination of nitrite. L-arginine (L-Arg), L-tyrosine (L-Tyr) and L-histidine (L-His), which arealiphatic, aromatic, and heterocyclic amino acids, respectively, were selected for this work, and thecorresponding electrodes were L-Arg-ERGO/GCE, L-Tyr-ERGO/GCE, and L-His-ERGO/GCE. Thesensing capabilities of the modified electrodes were characterized by electrochemical impedancespectroscopy (EIS), cyclic voltammetry (CV), and differential pulse voltammetry (DPV). Thecomparative results indicated the outstanding performance of L-histidine with an enhancedelectrochemical signal for nitrite due to its powerful imidazole groups, π-π interactions and lone pair-πinteractions.