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Electrochemical detection of carbohydrates at nickel‐copper and nickel‐chromium‐iron alloy electrodes
Author(s) -
Marioli Juan M.,
Kuwana Theodore
Publication year - 1993
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140050104
Subject(s) - nickel , amperometry , chromium , copper , electrochemistry , electrode , inorganic chemistry , alloy , detection limit , chemistry , materials science , metallurgy , chromatography
Nickel‐copper and nickel‐chromium‐iron alloy electrodes are employed in the amperometric detection of carbohydrates after anion‐exchange liquid chromatographic separation. The sugars are oxidized at the Ni(III) oxyhydroxide sites formed on the electrode surface at potentials of approximately 0.45 V (versus Ag/AgCl reference electrode). The set potential for the electrochemical detection of carbohydrates is optimized on a signal‐to‐noise (S/N) ratio analysis at different potential values. The detection limits for glucose, based on an S/N ratio of 3, are 15 and 1 picomoles at the nickel‐copper and the nickel‐chromium‐iron alloy electrodes, respectively. The electrodes' response was also assessed with respect to the detection of sugar alcohols, mono‐, and disaccharides.