Method of measuring blood component and sensor used in the method
First Claim
1. A method of measuring a blood component, comprising:
- bringing a sample containing blood into contact with a reagent containing an oxidoreductase that reacts with the blood component in the blood, a mediator, and a hemolyzing agent for hemolyzing an erythrocyte;
detecting a current generated by mixing of the sample and the reagent, the current being detected by electrodes; and
converting the detected current value into an amount of the blood component,wherein the mixing of the sample and the reagent causes a redox reaction between the blood component in the blood and the oxidoreductase, hemolysis of the erythrocyte in the blood and a reaction between hemoglobin released to an outside of the erythrocyte and the mediator,wherein detecting the current generated by mixing detects the current value that has been corrected to remove an effect of a hematocrit, andwherein the amount of the blood component obtained by converting the detected current value is the blood component amount that has been corrected to remove the effect of the hematocrit.
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Abstract
A sensor for blood component analysis that can correct the effect of a hematocrit easily is provided. The sensor includes an analysis portion including a working electrode, a counter electrode, and a reagent portion. The reagent portion includes an oxidoreductase that reacts with the blood component and a mediator, and the blood component is measured by causing a redox reaction between the blood component and the oxidoreductase in the presence of the mediator and detecting a redox current generated by the redox reaction by the working electrode and the counter electrode. In this sensor, the reagent portion further includes a hemolyzing agent (e.g., sodium cholate) for hemolyzing an erythrocyte, and when detecting the redox current, the erythrocyte is hemolyzed with the hemolyzing agent so as to cause hemoglobin released to an outside of the erythrocyte to react with the mediator and a current generated by this reaction also is detected to correct an effect of a hematocrit.
27 Citations
21 Claims
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1. A method of measuring a blood component, comprising:
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bringing a sample containing blood into contact with a reagent containing an oxidoreductase that reacts with the blood component in the blood, a mediator, and a hemolyzing agent for hemolyzing an erythrocyte; detecting a current generated by mixing of the sample and the reagent, the current being detected by electrodes; and converting the detected current value into an amount of the blood component, wherein the mixing of the sample and the reagent causes a redox reaction between the blood component in the blood and the oxidoreductase, hemolysis of the erythrocyte in the blood and a reaction between hemoglobin released to an outside of the erythrocyte and the mediator, wherein detecting the current generated by mixing detects the current value that has been corrected to remove an effect of a hematocrit, and wherein the amount of the blood component obtained by converting the detected current value is the blood component amount that has been corrected to remove the effect of the hematocrit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A sensor for measuring a blood component, comprising an analysis portion., the analysis portion comprising:
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a working electrode; a counter electrode; and a reagent portion, the reagent portion comprising (1) an oxidoreductase that reacts with the blood components, (2) a mediator, and (3) a hemolyzing agent for hemolyzing an erythrocyte, wherein within the analysis portion, the erythrocyte is hemolyzed with the hemolyzing agent, a redox reaction is caused between the blood component and the oxidoreductase in the presence of the mediator, a reaction is caused between hemoglobin released to an outside of an erythrocyte by the hemolysis and the mediator, and a current generated by the redox reaction and the reaction between the hemoglobin and the mediator is detected by the working electrode and the counter electrode, whereby an amount of the blood component that has been corrected to remove an effect of a hematocrit can be measured. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of measuring a blood component, comprising:
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hemolyzing an erythrocyte in blood so as to cause hemoglobin to be released to an outside of the erythrocyte; causing a redox reaction between the blood component and an oxidoreductase in the presence of a mediator so as to cause the hemoglobin released to the outside of the erythrocyte to react with the mediator; detecting a current generated by the redox reaction and the reaction between the hemoglobin and the mediator by electrodes, and converting the detected current value into an amount of the blood component, whereby the blood component amount that has been corrected to remove an effect of a hematocrit is measured.
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Specification