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Reduction of detectable species migration in elements for the analysis of liquids

  • US 4,166,093 A
  • Filed: 06/16/1978
  • Issued: 08/28/1979
  • Est. Priority Date: 08/08/1977
  • Status: Expired due to Term
First Claim
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1. In an element for the analysis of liquids, said element comprising a radiation-transmissive reagent layer permeable to a predetermined analyte, which layer comprises a composition that is interactive in the presence of said analyte to provide a radiometrically detectable species, and a porous radiation-blocking layer permeable to said analyte;

  • the improvement comprising a radiation-transmissive, detectable species migration-inhibiting layer interposed between the reagent layer and the porous radiation-blocking layer, said detectable species migration-inhibiting layer being permeable to said analyte and inhibiting the migration of said radiometrically detectable species to said porous radiation-blocking layer upon contact of said element with the liquid under analysis.

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