No abstract

Graphite electrodes were modified by the electrodeposition of either platinum or rhodium, using cyclic voltammetry. Following only brief periods of treatment. platinized carbon electrodes were able to directly oxidize glucose at a potential of 1350 niV (vs. Ag/AgCl). By narrowing both the potential range of deposition (-450 to -500 mV) and qcling period ( S O seconds at a scan rate of 10 mL' s-I), the effects of direct glucose oxidation could be significantly reduced. Detection of H 2 0 1 at 1-400 m\. was possible: glucose enzyme electrodes were constructed, with glucose oxidase immobilized in hydroxyethylcellulose, and operated at this potential. These sensors had a linear range of 0.1 to 25 my1 glucose and a slope of 8 nA/rn,l/I. Other electrodes were prepared by the electrodeposition of rhodium. These base electrodes proved to be insensitive to glucose and produced higher currents (compared to low platinum electrodes) to H 2 0 1 . Glucose sensors were constructed using rhodinized electrodes. Again operating at 1-400 m\'. these sensors had a linear range from 0.1 to 20 mhl and a slope of 21 rui/mlZiI glucose.

No abstract

No abstract

No abstract