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Prussian blue nanoparticles (PBNPs) were prepared by a self-assembly process on a glassy carbon electrode (GCE) modified with poly(o-phenylenediamine) (PoPD) film. The stepwise fabrication process of PBNP-modified PoPD/GCE was characterized using scanning electron microscopy and electrochemical impedance spectroscopy. The prepared PBNPs showed an average size of 70 nm and a homogeneous distribution on the surface of the modified electrode. The PBNPs/PoPD/GCE showed electrocatalytic activity towards the oxidation of pyridoxine (PN) and was used as an amperometric sensor. The modified electrode exhibited a linear response for PN oxidation over the concentration range 3-38.5 μM with a detection limit of ca 6.10 × 10 À7 M (S/N = 3) and sensitivity of 2.79936 × 10 3 mA M À1 cm À2 using an amperometric method. The mechanism and kinetics of the catalytic oxidation reaction of PN were investigated using cyclic voltammetry and chronoamperometry. The values of α, k cat and D were estimated as 0.36, 1.089 × 10 2 M À1 s À1 and 8.9 × 10 À5 cm 2 s À1, respectively. This sensor also exhibited good anti-interference and selectivity.

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