Biosensor Based on a Resonant Technique for Aqueous Glucose Monitoring Using Standardized Medical Test Tubes

This paper presents a biosensor based on a resonant technique that quantifies the glucose concentration of a water/glucose mixture inserted into a standard medical test tube, which is located in the middle of a waveguide. The biosensor provides real-time data about the concentration of the solution under test by means of microwave non-invasive measurements. Interaction between electromagnetic fields and the dielectric solution to be measured (water/glucose mixture) results in a change of the S-parameters, which are observed in the 2.6 to 3.95 GHz range. The technique presented here could be further used for the monitoring of other liquids or aqueous solutions.