A glucose sensor is similar to a pO2 sensor and is shown in Figure 10.34. Glucose andoxygen enter through the outside membrane to allow glucose to interact with the glucoseoxidase enzyme. The remaining oxygen penetrates through the second oxygen-permeablemembrane and is measured by the oxygen electrode.Biocatalytic enzyme-based sensors generally consist of an electrochemical gas-sensitivetransducer or an ion-selective electrode with an enzyme immobilized in or on a membranethat serves as the biological mediator. The analyte diffuses from the bulk sample solutioninto the biocatalytic layer, where an enzymatic reaction takes place. The electroactive
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