Honey carbohydrate analysis by HPLC, with electrochemical detection, using a Ni-Cr alloy electrode

Honey carbohydrates were analyzed by high performance anion exchange liquid chromatography with constant potential amperometric detection at a nickel-chromium (80:20) alloy electrode. The sugars are oxidized by a surface catalyzed process proposed to involve Ni(II)/Ni(III) oxyhydroxides, which are formed at approximately 0.500 V (Saturated Calomel as reference electrode). The honey content of glucose, fructose, and sucrose is determined in less than 15 minutes per sample. The high sensibility achieved with this alloy electrode allowed for the analysis of disaccharides and oligosaccharides usually present in honey as minor components. The analysis of these carbohydrates may be useful for the determination of the floral origin of honey.