Process and test carrier for the determination of an analyte

Chemistry: molecular biology and microbiology – Measuring or testing process involving enzymes or... – Involving antigen-antibody binding – specific binding protein...

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422 56, 435 71, 435 792, 435 795, 435 10, 435 18, 435174, 436501, 436518, 436528, 436529, 436536, 436537, 436540, 436547, 436823, G01N 3353, G01N 33543, G01N 33536, C12Q 134

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active

050377361

ABSTRACT:
The present invention provides a process for the determination of an analyte in a body fluid, in which there are used two binding components capable of specifically binding with one another, one of the binding components being enzyme-labelled and not carrier-fixed and the other binding component being carrier-fixed. The process contains a step in which the binding components are incubated with one another so that binding reaction takes place. The amount of enzyme-labelled binding component not bound to the carrier-fixed binding component is a measure of the concentration of the analyte which is determined by allowing the labelling enzyme to act upon a substrate producing a detection signal. During the specific binding reaction, incubation is carried out simultaneously with a non-fixed substrate of the labelling enzyume which does not produce a detection signal and with a carrier-fixed substrate of the labelling enzyme which produces a detection signal, the substrate not producing a detection signal being so chosen with regard to the amount used and affinity to the labelling enzyme in relation to the amount of the substrate producing a detection signal and its affinity to the labelling enzyme and in relation to the total activity of the labelling enzyme that the enzyme-catalyzed reaction of the substrate producing a detection signal is delayed until the specific binding reaction between the binding components has substantially taken place.

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patent: 4868131 (1989-09-01), Hiratsuka
Oellerich, J. Clin. Chem. Biochem., vol. 22, 1984, pp. 895-904.

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