Claims
- 1. An enzyme electrode unit, comprising:
- an enzyme-immobilized membrane;
- a first diffusion-limiting membrane having a first target substance diffusion limiting effect, said first membrane being secured to the surface of said enzyme-immobilized membrane;
- a second diffusion-limiting membrane having a target substance diffusion limiting effect which is lower than said first target substance diffusion limiting effect;
- first holding means for holding in place said first diffusion-limiting membrane and said enzyme-immobilized membrane; and
- second holding means for holding said second diffusion-limiting membrane in a releasably disposed manner on a surface of said first diffusion-limiting membrane
- 2. An enzyme electrode unit as set forth in claim 1, wherein each of said diffusion-limiting membranes has a penetration ratio, and the penetration ratio of the second diffusion-limiting membrane is greater than the penetration ratio of the first diffusion-limiting membrane.
- 3. An enzyme electrode unit as set forth in claim 1, wherein the second diffusion-limiting membrane prevents substances having a particle diameter greater than that of a target substance to be measured, from penetrating therethrough.
- 4. An enzyme electrode unit as set forth in claim 1, wherein said second holding means is a plastic cap.
- 5. An enzyme electrode unit as set forth in claim 1, wherein the enzyme-immobilized membrane provokes an enzyme reaction of a target substance in blood, and the second diffusion-limiting membrane separates blood corpuscles.
- 6. An enzyme electrode unit as set forth in claim 1, wherein the enzyme-immobilized membrane is a membrane in/on which glucose oxidase is immobilized.
- 7. An enzyme electrode unit as set forth in claim 1, wherein the target substance is glucose, and the glucose diffusion limiting membrane effect of the first diffusion-limiting membrane is greater than the glucose diffusion limiting effect of the second diffusion-limiting membrane.
- 8. An enzyme electrode unit as set forth in claim 1, further comprising a selective penetration membrane, and wherein the enzyme-immobilized membrane is sandwiched in between said selective penetration membrane and said first diffusion-limiting membrane, and said selective penetration membrane, said enzyme-immobilized membrane and said first diffusion limiting membrane are integrally laminated and held as a unit.
- 9. An enzyme electrode unit as set forth in claim 8, wherein the selective penetration membrane is stuck and secured to the enzyme-immobilized membrane by a casting membrane method, and the first diffusion-limiting membrane is bonded to the enzyme-immobilized membrane.
- 10. An enzyme electrode unit as set forth in claim 8, wherein the selective penetration membrane is a hydrogen peroxide selective penetration membrane of hydrogen peroxide, the first diffusion-limiting membrane is a diffusion-limiting membrane of glucose, and the enzyme-immobilized membrane is a membrane in/on which glucose oxidase is immobilized.
- 11. An enzyme electrode unit as set forth in claim 1, wherein said second holding means is a resilient plate with an aperture formed therein.
- 12. An enzyme electrode unit comprising:
- an enzyme-immobilized membrane;
- a first diffusion-limiting membrane having a first target substance diffusion limiting effect, said first membrane being secured to the surface of said enzyme-immobilized membrane;
- a second diffusion-limiting membrane having a target substance diffusion limiting effect which is lower than said first target substance diffusion limiting effect;
- first holding means or holding in place said first diffusion-limiting membrane and said enzyme-immobilized membrane; and
- second holding means for holding said second diffusion-limiting membrane disposed on a surface of said first diffusion membrane, and said second holding means being releasably attached to said first holding means.
- 13. An enzyme electrode unit comprising:
- an enzyme-immobilized membrane;
- a first diffusion-limiting membrane having a first target substance diffusion limiting effect, said first membrane being secured to the surface of said enzyme-immobilized membrane;
- a second diffusion-limiting membrane having a target substance diffusion limiting effect which is lower than said first target substance diffusion limiting effect;
- first holding means for holding in place said first diffusion-limiting membrane and said enzyme-immobilized membrane; and
- second holding means for holding said second diffusion-limiting membrane disposed on a surface of said first diffusion membrane, and said second holding means including means for enabling the release of said second diffusion-limiting membrane from a disposed position on the surface of said first diffusion-limiting membrane while maintaining the essential integrity of said first diffusion-limiting membrane.
Priority Claims (2)
Number |
Date |
Country |
Kind |
62-80431 |
Mar 1987 |
JPX |
|
62-80433 |
Mar 1987 |
JPX |
|
Parent Case Info
This application is a continuation, of application Ser. No. 176,281, filed Mar. 31, 1988, now abandoned.
US Referenced Citations (3)
Continuations (1)
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Number |
Date |
Country |
Parent |
176281 |
Mar 1988 |
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