| 摘要 |
PURPOSE:To maintain the specified thickness of an enzyme-immobilized film and to improve the durability of an enzyme sensor by coating a porous or hydrophilic hollow yarn-like film immobilized with enzyme to the sensitive part of a slender superminiature electrode. CONSTITUTION:A source electrode and drain electrode 1 of a semiconductor ion sensor are provided in a catheter 2 and a lead wire 3 is connected thereto. The top end of a sensor 1 is used as the sensitive part (gate region) 4 and is projected from the catheter 2. The part 4 is coated with the porous hollow yarn-like film 6 immobilized with the enzyme and a resin 7 is sealed into the aperture at the top end thereof. The circumference of the electrode 1 is fixed with an electrical insulating layer 8. For example, the porous hollow yarn-like film which is made of PP or PVA and is immobilized with urease, glucose oxidase, etc. is used for the film. The hollow yarn-like film immobilized with the enzyme is used for the enzyme sensor and therefore the durability and performance of the sensor are improved. |
