method and device for the determination of two different substances in a sample using enzymelektroden.

摘要

The invention relates to a method and an apparatus for the determination of two different substances in liquid samples, e.g. glucose as a first substance and of sucrose as a second substance to be measured. The apparatus is provided with a first enzyme electrode (2) and a second enzyme electrode (4) and a dilution pipeline (5) provided between these electrodes and for diluting the substances. A sample containing the first and second substances is fed intermittently into a constant flow of a buffer solution (8). The first enzyme electrode (2) detects the first substance. The second enzyme electrode (4), which comprises an immobilized enzyme catalyzing the conversion of the second substance into the first substance, detects the first substance, which is originally contained in the sample as well as that formed on the second enzyme electrode (4). The concentration of the second substance in the sample is calculated from the outputs of the first and second enzyme electrodes (2, 4).