NADH electrocatalytic oxidation at glassy carbon paste electrodes modified with Meldola blue adsorbed on alpha-titanium phosphate

Basic electrochemistry of glassy carbon paste electrodes (GCPEs) modified with Meldola Blue adsorbed on crystalline a-titanium phosphate (MB-a-TP) electrodes and their ability to catalyze the NADH oxidation have been investigated. Various ratios of glassy carbon (Sigradur K) to MB-alpha-TP, were used to obtain GCPEs. Cyclic voltammetry (CV) and rotating disc electrode (RDE) measurements, performed in Tris buffer solution, showed that: (1) the MB formal potential vs. pH dependence is linear; (2) the addition of polyethyleneimine (PEI) to the paste electrode has a significant beneficial effect on the electrooxidation of NADH. As a general conclusion, it can be stated that GCPEs modified with MB-alpha-TP and incorporating 2.44% (w/w) PEI exhibits the best behavior for NADH electrocatalytic oxidation