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Glucose dehydrogenase (E.C. 1.1.99.17) has been used to produce an amperometric enzyme electrode for glucose. With phenazine ethosulphate a s the electron mediator, a linear response for up to 0.8 mM glucose was obtained with response times of 3-5 min. 2,6-Dichlorophenolindophenol as mediator gave long (> 30 min) response times, but the measurement time was reduced to 30 s by monitoring the first-order differential of the response; the derivatised signal allowed temporal separation of the enzyme-mediated signal from electrochemical interference. Whole blood glucose measurements were correlated with a spectrophotometric method based on glucose oxidase ( y = 0 . 8 4 ~ + 0.67, r = 0.963, n = 36).

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