Flow injection amperometric determination of pyridoxine at a Prussian blue nanoparticle-modified carbon ceramic electrode |
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Authors: | H Razmi R Mohammad-Rezaei |
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Affiliation: | Electrochemistry Research Lab., Faculty of Sciences, Azarbaijan University of Tarbiat Moallem, P.O. Box 53714-161, Tabriz, Iran |
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Abstract: | This work describes the electrocatalytic properties of a carbon composite electrode (CCE) modified with Prussian blue (PB) nanoparticles (NPs) for the electrocatalytic oxidation of pyridoxine (PN). The morphology of the PBNP-modified CCE was characterized by scanning electron microscopy (SEM). The mechanism and kinetics of the catalytic oxidation reaction of PN were monitored by cyclic voltammetry and chronoamperometry. The rate-limiting step of the charge transfer reaction was found to be a one-electron abstraction. The value of α, k, and D were calculated as 0.66, 6.7 × 104 M−1 s−1, and 1.88 × 10−5 cm2 s−1, respectively. The modified electrode showed electrocatalytic activity toward the oxidation of PN and was used as an amperometric sensor. The sensor exhibited good linear response for PN over the concentration ranges 5-69 and 1-80 μM with detection limits of 0.51 and 0.87 μM, and sensitivities of 0.97 and 0.673 A M−1 cm−2 in batch and flow conditions, respectively. Some important advantages such as simple preparation, fast response, good stability, and reproducibility of the sensor for the amperometric determination of PN were achieved. |
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Keywords: | Prussian blue Nanoparticles Flow injection Pyridoxine Carbon ceramic |
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