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Throwaway type chemical sensor

  • US 5,741,634 A
  • Filed: 06/06/1995
  • Issued: 04/21/1998
  • Est. Priority Date: 08/03/1993
  • Status: Expired due to Fees
First Claim
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1. An enzyme electrode of a chemical sensor comprising:

  • an electrode portion including a pair of working electrodes, a reference electrode and a counter electrode;

    a first film formed on one of said working electrodes, said first film comprising polyvinyl alcohol and surface-active agent which accelerates diffusion of a test sample solution through said first film;

    a second film formed on the other working electrode, said second film comprising polyvinyl alcohol, enzyme and a surface-active agent which accelerates diffusion of a test sample solution through said second film; and

    an overcoat film formed on said first and second film, said overcoat film comprising a high polymer electrolyte including pH buffer wherein said high polymer electrolyte is selected from the group consisting of polyacrylic acid and water soluble polysaccharide containing carboxyl groups; and

    wherein said pH buffer reduces variation of the concentration of hydrogen ions in said test sample.

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