Glucose measurement in diluted blood.

The sensitivity, measuring range and lifetime of enzyme electrodes using glucose oxidase sandwiched between dialysis membranes or alternatively in a polyurethane layer directly on the surface of a platinum electrode are compared. The GOD modified electrode exhibits the highest sensitivity. However, the signal depends strongly on the stirring rate. Using the sandwich membranes up to 120 diluted blood samples per hour with a serial coefficient of variation below 1% can be analyzed.