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Benzoquinone (BQ) in solution catalyses the electrochemical oxidation of ascorbic acid (AH,) at basal plane graphite (BPG) electrode. The overpotential for AH2 decreases by 120mV at pH7.3 in presence of BQ as compared to the potential without BQ. A simultaneous increase in anodic current in the cyclic voltammogram of BQ as a function of AHZ forms the basis of a sensor for AH2. The kinetics for the reaction between AH2 and BQ have been determined by cyclic voltainmetric data

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An amperometric enzyme sensor for the analysis of glucose is described. The sensor uses benzoquinone as a mediator for electron transfer between immobilized glucose oxidase and a pyrolytic graphite electrode. A linear current response, proportional to glucose concentration in the range 1-50 mM, is observed. The influence of oxygen, pH and operating potential on the sensor performance is examined.