| 摘要 |
The method and test support are for determining an analyte from a sample, in particular a body fluid.
<??>Two biological materials are used which are specifically capable of binding to one another (binding partners), one binding partner being enzymatically labelled and not carrier-immobilised and the other being carrier-immobilised.
<??>The method comprises a reaction step in which the binding partners are incubated together so that a specific binding reaction proceeds between them. At the end of the specific binding reaction, the amount of the enzymatically labelled binding partner not bound to the carrier-immobilised binding partner is a measure of the concentration of the analyte. This amount is determined by incubating, during the specific binding reaction, together with a nonimmobilised substrate of the labelling enzyme which does not generate a detection signal and with a carrier-immobilised substrate of the labelling enzyme which does generate a detection signal, the substrate which does not generate a detection signal being chosen in such a way that, when the free enzymatically labelled binding partner is incubated simultaneously with both substrates, the enzymatically catalysed reaction of the substrate which generates a detection signal is delayed until the specific binding reaction between the binding partners is essentially complete.
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