Electrochemical assay method with novel p-phenylenediamine compound
First Claim
1. A method of measuring a substance in a liquid biological sample which comprisescontacting with a sample containing said substance at least one oxidation-reduction enzyme and an electron mediator wherein said electron mediator is a compound represented by the following formula (I) or a salt thereof:
- ##STR9## wherein R1, R2, R3 and R4 may be the same or different from one another and each represents a straight- or branched-chain alkyl group having 1 to 4 carbon atoms with the proviso that at least one of R1, R2, R3 and R4 has at least one group selected from the group consisting of hydroxyl, mercapto, carboxyl, phosphonooxy and sulfo; and
measuring said substance with an electrode capable of performing electron transfer with said electron mediator.
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Abstract
An enzyme electrode, specific binding or the like electrochemical assay method capable of performing always stably high detection sensitivity (responsibility) and reappearance even in the case of blood, urine and the like samples that contain interfering substances and also of applying suitably to disposable use, and a novel p-phenylenediamine compound which is used in the assay method. Particularly, an electrochemical assay method in which a substance in a liquid sample is assayed using at least one oxidoreductase, wherein an oxidoreductase, an electron mediator and an electrode which performs electron transfer with the mediator are arranged in the assay system, and a compound of the following formula [I] or a salt thereof is used as the mediator which is highly soluble in water, dried (by freeze-, vacuum- or air-drying) easily and stable under dry condition, shows a high electron transfer rate with enzymes and is almost free from the influence of interfering substances in blood, urine and the like samples: ##STR1## wherein R1 to R4 may be the same or different from one another and each means a hydrogen, a straight- or branched-chain alkyl group having 1 to 4 carbon atoms, optionally having a substituent, providing that at least one of R1 to R4 has one or more groups selected from hydroxyl, mercapto, carboxyl, phosphonooxy and sulfo.
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Citations
13 Claims
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1. A method of measuring a substance in a liquid biological sample which comprises
contacting with a sample containing said substance at least one oxidation-reduction enzyme and an electron mediator wherein said electron mediator is a compound represented by the following formula (I) or a salt thereof: - ##STR9## wherein R1, R2, R3 and R4 may be the same or different from one another and each represents a straight- or branched-chain alkyl group having 1 to 4 carbon atoms with the proviso that at least one of R1, R2, R3 and R4 has at least one group selected from the group consisting of hydroxyl, mercapto, carboxyl, phosphonooxy and sulfo; and
measuring said substance with an electrode capable of performing electron transfer with said electron mediator. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- ##STR9## wherein R1, R2, R3 and R4 may be the same or different from one another and each represents a straight- or branched-chain alkyl group having 1 to 4 carbon atoms with the proviso that at least one of R1, R2, R3 and R4 has at least one group selected from the group consisting of hydroxyl, mercapto, carboxyl, phosphonooxy and sulfo; and
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8. A method of measuring a substance in a liquid sample comprising contacting with a sample containing said substance, at least one oxidation-reduction enzyme, and an electron mediator wherein said electron mediator is a compound represented by the following formula (II) or a salt thereof:
- ##STR11## wherein R5, R6, R7 and R8 may be the same or different from one another and each represents a hydrogen, a straight- or branched-chain alkyl group having 1 to 4 carbon atoms with the proviso that at least one of R5, R6, R7 and R8 is an alkyl group which has at least one group selected from the group consisting of hydroxyl, mercapto, carboxyl, phosphonooxy and sulfo, and at least one of R5, R6, R7 and R8 is hydrogen; and
measuring said substance with an electrode capable of performing electron transfer with an electron mediator. - View Dependent Claims (9, 10, 11, 12, 13)
- ##STR11## wherein R5, R6, R7 and R8 may be the same or different from one another and each represents a hydrogen, a straight- or branched-chain alkyl group having 1 to 4 carbon atoms with the proviso that at least one of R5, R6, R7 and R8 is an alkyl group which has at least one group selected from the group consisting of hydroxyl, mercapto, carboxyl, phosphonooxy and sulfo, and at least one of R5, R6, R7 and R8 is hydrogen; and
Specification