AbstractA water‐insoluble modified methyl‐siloxane polymer which held 9‐dimethylaminobenzoaphenoxazine‐7‐ium (Meldola Blue) units, was synthesized, characterized, and used to drop‐coat solid graphite electrodes. The electrocatalytic oxidation of the nicotinamide adenine dinucleotide (NADH) in the polymer could be described by the Michaelis–Menten type of kinetics as seen from steady‐state measurements in 0.25 M phosphate buffer, pH7, at 0 mV (vs. SCE). The electrocatalytic properties of the redox polymer was evaluated using the film thickness as a major variable. The theoretical model found to describe the NADH oxidation at the redox polymer modified electrode, is presented. A maximum NADH sensitivity of 40 μA cm−2mM−1at a coverage of 0.5
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