title: Catalytic oxidation and flow detection of carbohydrates at ruthenium dioxide modified electrodes.
abstract: Ruthenium dioxide (RuO2) containing carbon paste electrodes exhibiting electrocatalytic response toward carbohydrates are described. The electrocatalytic behavior is exploited for developing a highly stable and sensitive flow detection scheme for carbohydrates at a low and fixed potential (+0.4 V vs Ag/AgCl). The effects of pH, flow rate, operating potential, surface "loading", concentration, and other variables are explored. The electrode response was stable for more than 48 h, with a signal loss of less than 10% over this period. The detection limits at the picomole level and a relative standard deviation of 1.2% (n = 72) are reported. Electrocatalytic oxidation is described also for related polyhydroxyl compounds (aldonic and aldaric acids and alditols).
authors.affiliation: Department of Chemistry, New Mexico State University, Las Cruces 88003.
authors.forename: J
authors.initials: J
authors.lastname: Wang
authors.forename: Z
authors.initials: Z
authors.lastname: Taha
mesh_terms: D002241:Carbohydrates / Q000032:analysis*; D002384:Catalysis; D004563:Electrochemistry; D004566:Electrodes; D006863:Hydrogen-Ion Concentration; D010084:Oxidation-Reduction; D012428:Ruthenium; D017975:Ruthenium Compounds
chemical_list: D002241:Carbohydrates; D017975:Ruthenium Compounds; C029017:ruthenium dioxide; D012428:Ruthenium