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Apparatus for measuring substrate concentrations

  • US 4,005,002 A
  • Filed: 08/01/1974
  • Issued: 01/25/1977
  • Est. Priority Date: 08/06/1973
  • Status: Expired due to Term
First Claim
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1. A device for measuring the concentration of substrates of enzyme reactions occurring during intermediate metabolism, more particularly the concentration of lactate and glucose in fluid biological samples, including a measuring cell formed as a tubular chamber for receiving the fluid sample, an enzyme electrode containing a platinum or gold electrode, an enzyme layer and a semi-permeable membrane covering the enzyme layer;

  • a reference electrode;

    said tubular chamber being placed between the contact surfaces of said electrodes; and

    an electrical circuit for measuring the current which flows through the platinum or gold electrode,which device is characterized in that it comprises means for locally regulating the temperature of the enzyme layer, a hydraulic device for alternately filling the measuring cell with an acceptor-containing buffer solution or a fluid sample, and said electrical current measuring circuit includes an electronic circuit which, after the measuring cell has been filled with a fluid sample, determines the peak value of the current flowing through the platinum or gold electrode, the peak value, being representative of the concentration of substrate to be measured.

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