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Enhanced Electron Transfer and Catalytic Activity of Cyanocobalamin with -Cyclodextrin

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Abstract:

The electrochemistry and the electrocatalytic property of cyanocobalamin were studied. -cyclodextrin was found to be able to enhance the adsorption ability of cyanocobalamin at the surface of pyrolytic graphite electrode. Moreover, it could facilitate the electron transfer rate between cyanocobalamin and the electrode. A pair of well-defined cyclic voltammetric peaks for the redox reactions between [Co(III)] and [Co(II)] of cyanocobalamin was observed. The formal potential was at about −790 mV versus a saturated calomel electrode, which was much lower than the previous reports. Furthermore, cyanocobalamin was observed to exhibit a remarkable electrocatalytic activity towards the reduction of NO, NO2, and trichloroacetic acid (TCA).

Keywords: BETA-CYCLODEXTRIN; CYANOCOBALAMIN; CYCLIC VOLTAMMETRY

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/sl.2006.057

Publication date: December 1, 2006

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