Enzyme electrode unit
First Claim
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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
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Abstract
An enzyme electrode unit having, on the surfaces of the base electrodes thereof, an enzyme-immobilized membrane for oxidizing or reducing a target substance to be measured, and a diffusion-limiting membrane unit of a two-layer structure disposed on the surface of the enzyme-immobilized membrane, only the diffusion-limiting membrane having a lower target substance diffusion limiting effect being replaceable, thus maintaining substantially constant the general target substance diffusion limiting effect of the diffusion-limiting membrane unit, even after the replaceable diffusion-limiting membrane has been replaced.
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Citations
13 Claims
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1. An enzyme electrode unit, comprising:
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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 - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An enzyme electrode unit comprising:
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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.
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13. An enzyme electrode unit comprising:
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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.
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Specification