The currently available measuring systems – so-called continuously measuring glucose sensors – determine the glucose concentration in the tissue fluid under the skin. These glucose values are delayed by several minutes compared to the actual blood glucose values. Glucose levels in the blood can change rapidly due to activity, food intake, hormone fluctuations or illness. This pushes current glucose sensors to their limits and complicates systems that depend on this measurement – for example, systems for automated insulin delivery. To enable these systems for completely automated insulin delivery (so-called “closed-loop systems” or “artificial pancreases”), new sensors are needed that measure the glucose level in the blood in real time, i.e. without delay.