Chemically modified electrodes obtained by direct interaction between gold substrate and tetracyanonickelate(II) ions in alkaline medium were characterized by cyclic voltammetry toward the electrooxidation of carbohydrates. Satisfactory performance with respect to catalytic stability, background current stability and lowering of detection limit was obtained for the analysis of ten oligosaccharides contained in a synthetic sample by anion-exchange chromatography in alkaline solutions. Under constant applied potential of 0.55V (vs. Ag/AgCl), the detection limits (S/N=3) for all investigated compounds ranged between 3 and 6 pmol injected for melezitose and turanose, respectively. The dynamic linear ranges spanned generally three orders of magnitude above the limit of detection. The effects of the concentration of tetracyanonickelate(II) ion on the catalytic activity, amperometric stability and chromatographic separations were examined.
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