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Electrochemical measuring apparatus provided with an enzyme electrode

  • US 4,388,166 A
  • Filed: 05/15/1982
  • Issued: 06/14/1983
  • Est. Priority Date: 08/14/1979
  • Status: Expired due to Fees
First Claim
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1. An electrochemical measuring apparatus provided with an enzyme electrode which comprises an electrode having adjacent thereto a filter membrane which is permeable to a material to be detected but impervious to a material of larger particle size than the material to be detected, a separate immobilized enzyme membrane deposited on said filter membrane, and an asymmetric semipermeable membrane mounted on the immobilized enzyme membrane, said asymmetric semipermeable membrane being essentially formed of an outer thin semipermeable layer of a thickness less than 1 micron exposed to contact with a liquid to be measured and an inner thick porous layer within said thin semipermeable layer, whereby the concentration of an organic ingredient contained in said liquid to be measured is determined by utilizing the reaction of the enzyme set in said immobilized enzyme membrane.

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