Oxygen-independent glucose microsensor based on glucose oxidase

A glucose oxidase-based needle-type microsensor is described that is independent of the local oxygen concentration. The sensor consists of an enzyme-coated platinum microelectrode that is inserted in a glass capillary with a tip of 5–25 μm, and connected to the environment via an agar membrane. Oxygen is supplied to the enzyme coating from the shaft of the capillary. Depending on the electrode configuration, the sensor has a response time of 1–10 s, and the measuring range extends from 0.01 to 0.4 mmol l −1 or from 0.4 to 10 mmol l −1 . The signal is not affected by stirring.