| 摘要 |
PURPOSE:To extend the life of a biosensor by applying an opposite potential to an electrode of the biosensor having a physiologically active substance immobilized during the measuring operation of an object to be inspected in a measurement to remove a matter eventually adsorbed on the electrode. CONSTITUTION:A solvent 4 in a solvent reservoir 1 runs through a tube 3 with a pump 5, a certain voltage is applied to a working electrode 8 and an opposed electrode 9 from a power source 10 and then, a sample is injected into an inlet 6. Current value obtained by measuring the magnitude of the current flowing between the working electrode 8 and the opposed electrode 9 corresponds to the mass of an object to be inspected. When a potential is applied to the working electrode, substance other than substances to be inspected in the sample is adsorbed on a film having a physiologically active substance immobilized to reduce the sensitivity gradually. To counter this, an opposite potential to that during the measuring operation is applied to the working electrode 8 and the opposed electrode 9 running a liquid such as solvent through the tube 3 between the measuring operations to remove matter adsorbed during the measuring operation thereby extending the life of a biosensor. |
