Glucose determination by means of a new reactor/sensor system operating under non-isothermal conditions

The dynamic and steady-state responses as well as the response times of a glucose biosensor have been studied under isothermal and non-isothermal conditions as a function of analyte concentration. The presence of a temperature gradient across the catalytic membrane system improved the biosensor characteristics, because the dynamic and steady-state responses increased and the response times decreased under non-isothermal conditions. For example, a macroscopic temperature difference of 20 degrees C applied across the catalytic membrane system increases the biosensor sensitivity of 70% and reduces of 50% its response time. The dependence of the observed effects on the magnitude of the temperature difference applied has been correlated with the substrate (and products) transport across the catalytic membrane system due to the process of thermodialysis.