Membrane for enzyme electrodes Patent #: 3979274
ApplicationNo. 06/029128 filed on 04/11/1979
US Classes:205/782.5, Using semipermeable membrane204/406, With significant electrical circuitry or nominal computer device600/347, Blood glucose600/365Glucose measurement
ExaminersPrimary: Kaplan, G. L.
Attorney, Agent or Firm
International ClassesG01N 27/30 (20060101)
G01N 27/49 (20060101)
Foreign Application Priority Data1978-04-20 DE
AbstractA method for determining the concentration of sugar in the presence of interfering foreign substances, particularly for determining glucose in a body fluid, by means of an electrocatalytic sugar sensor which has a measuring electrode in which the measuring electrode is alternatingly set potentiostatically to a reactivation and a measuring potential and the current flowing during the measuring period is evaluated as the measurement signal. To prevent foreign substances from exerting an interfering influence and thereby permit a sensitive sugar determination which is reliable over an extended period of time, a hydrophilic diaphragm is arranged in front of the measuring electrode to impede the resupply of the interfering foreign substances to the measuring electrode so that a diffusion limit current adjusts itself during the reactivation phase in the oxidation of the foreign substances; and the current is evaluated with a time delay relative to the start of the measuring period.