15 Blood glucose sensor. To sense the concentration of glucose in blood for the purpose of monitoring diabetes, one can

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15 Blood Glucose Sensor To Sense The Concentration Of Glucose In Blood For The Purpose Of Monitoring Diabetes One Can 1 (80.29 KiB) Viewed 37 times

15 Blood glucose sensor. To sense the concentration of glucose in blood for the purpose of monitoring diabetes, one can use a thermistor coated with the enzyme glucose oxidase and sense the temperature of the thermistor. Normal glucose levels in blood are between 3.6 and 5.8mmol/L. Glucose has the formula C6​H12​O6​ and has an enthalpy of 1270 kJ/mol. The thermistor has a heat capacity of 24 mJ/K (the heat capacity for thermistors is typically given in mJ/K, a quantity that takes into account its mass) and a nominal resistance of 24kΩ at 20∘C. Assume the enzyme samples 0.1mg of blood. Assume as well that blood is mostly water. The sensing is done at the normal blood temperature of 36.8∘C. a. Calculate the increase in temperature of the thermistor over the range of normal glucose levels in blood. b. Calculate the sensitivity of the sensor over the span given. c. If, in addition, one measures the resistance of the thermistor as 18.68kΩ at 30∘C, calculate the range and span of the resistance of the thermistor and its sensitivity in terms of the resistance measured.