Immobilized enzymes are used analytically in various electrochemical techniques.The use of an ion-selective electrode that is coated with an enzyme that produces ions when placed in a substrate solution is a type of:

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The use of an ion-selective electrode coated with an immobilized enzyme that produces ions when placed in a substrate solution is a type of potentiometric measurement. Potentiometric measurements involve measuring the potential difference between two electrodes in a solution to determine the concentration of an ion or molecule. The immobilized enzyme acts as a sensor for the substrate, producing ions that can be measured by the ion-selective electrode.

Immobilized Enzymes Are Used Analytically in Various Electrochemical Techniques