Grafted Azure A modified electrodes as disposable β-nicotinamide adenine dinucleotide sensors

► Electrografting of Azure A diazonium salt onto screen-printed electrodes is described. ► These modified electrodes are electrochemically characterized. ► Modified electrodes shows a persistent catalytic activity toward NADH oxidation. ► Rapid, sensitive, selective, robust, stable and disposable NADH sensors are described.