| abstract |
(57) [Summary] [Purpose] To avoid the deterioration of measurement accuracy due to the temperature of the solution to be measured. [Structure] The biosensor 1 is formed of a working electrode 5, a reference electrode 6 and a counter electrode 7 made of platinum, and a Pt-Pd alloy on the upper surface of an insulating substrate 3 made by sintering alumina, and is self-controlled at 37 ° C. A self-temperature control heater 10 for temperature is provided, and an identification layer 9 carrying glucose oxidase and a ferrocene derivative is fixedly provided on the upper surface of the working electrode 5. Then, a predetermined weak voltage for measurement is applied between the working electrode 5 and the reference electrode 6 and between the counter electrode 7 and the reference electrode 6, and the self-temperature control heater 10 is constantly supplied with current. As a result, the self-temperature control heater 10 outputs the sensor output while maintaining the temperature around the working electrode at 37 ° C. |