Surface redox-mediated dihydronicotinamide adenine dinucleotide probes based on ionic liquids covalently bound with catechol functionality

A novel imidazolium-based ionic liquid (IL), covalently bound to catechol (CA) groups by carbodiimide-mediated coupling reactions, was synthesized and used as the electrochemical sensing probe for dihydronicotinamide adenine dinucleotide (NADH). The thin layer of the CA-functionalized IL (IL-CA) at the screen-printed carbon electrode (SPCE) exhibited a stable redox couple originating from the catechol/quinone at the terminus. The redox-active...