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Method for measuring the concentration or change in concentration of a redox-active substance and corresponding device

  • US 8,105,478 B2
  • Filed: 01/26/2005
  • Issued: 01/31/2012
  • Est. Priority Date: 01/29/2004
  • Status: Active Grant
First Claim
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1. A method for measuring at least one of a concentration and change in concentration of a redox-active substance as a mediator in a molecular-biological detection system, in which as a result of application of suitable potentials to a working electrode, at least one of a reduction process and an oxidation process takes place as a redox reaction, the method comprising:

  • measuring an oxidation current to obtain a measuring phase;

    measuring a reduction current to obtain a relaxation phase;

    pulsing the potential of the working electrode, and alternately forming the measuring phases and the relaxation phases;

    selecting measuring-phase pulse lengths so that, at the end of the pulse, a capacitive current is small in comparison with a Faraday current; and

    selecting relaxation-phase pulse lengths so that, at the end of the pulse, a concentration gradient is relaxed such that at a beginning of a following measuring phase, the change in concentration of the mediator, brought about by the measurement of the mediator, is reversible.

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