Oxygen stabilized enzyme electrode
First Claim
1. Enzyme electrode for the analysis of a substrate in a sample comprising:
- (a) an oxygen electrode on which or close to the sensitive surface of which at least one enzyme is immobilized, said oxygen electrode producing a signal responsive to the consumption of oxygen by the reaction between the enzyme and the substrate,(b) means for producing a reference signal,(c) means for electrolytically producing oxygen by the electrolysis of water, comprising an anode located close to the at least one enzyme, and a cathode,(d) means for controlling the electrolysis current between the anode and cathode for producing oxygen in response to the difference between the signal from the oxygen electrode and the reference signal so that the limiting parameter for the enzyme reaction is the enzyme activity, and(e) means for measuring the electrolysis current.
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Abstract
An enzyme electrode based on an oxygen electrode and an oxygen consuming enzyme is described. The oxygen demand of the electrode is satisfied through an electrolytical oxygen production by means of an anode located close to the enzyme and the sensitive surface of the oxygen electrode. The deviation from a reference value, which could be constant or be formed by the signal from an enzymatically passive oxygen electrode, of the oxygen electrode signal, is used to control the electrolysis current in order to keep the oxygen activity in the enzyme electrode constant. The electrolysis current is used as a measure of the concentration of the substrate of the enzyme.
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Citations
10 Claims
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1. Enzyme electrode for the analysis of a substrate in a sample comprising:
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(a) an oxygen electrode on which or close to the sensitive surface of which at least one enzyme is immobilized, said oxygen electrode producing a signal responsive to the consumption of oxygen by the reaction between the enzyme and the substrate, (b) means for producing a reference signal, (c) means for electrolytically producing oxygen by the electrolysis of water, comprising an anode located close to the at least one enzyme, and a cathode, (d) means for controlling the electrolysis current between the anode and cathode for producing oxygen in response to the difference between the signal from the oxygen electrode and the reference signal so that the limiting parameter for the enzyme reaction is the enzyme activity, and (e) means for measuring the electrolysis current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification