Reduction of detectable species migration in elements for the analysis of liquids
First Claim
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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Abstract
An element for the analysis of liquids contains a radiation-transmissive, detectable species migration-inhibiting layer interposed between a porous radiation-blocking layer and a radiation-transmissive reagent layer. All three layers are permeable to a predetermined analyte. The reagent layer contains a composition that provides a detectable species such as a dye in proportion to the concentration of the analyte that diffuses into the reagent layer from the overlying porous radiation-blocking layer. The detectable species migration-inhibiting layer acts to reduce the migration of, for example, dye from the reagent layer into the porous radiation-blocking layer, where the optical density of the dye cannot easily be measured. Optionally, the above-described three layers can be carried on a radiation-transmissive support, and other layers such as spreading layers, registration layers, and subbing layers can also be present in the element.
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Citations
17 Claims
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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. - View Dependent Claims (2)
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3. 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 dye, and a porous radiation-blocking layer permeable to said analyte;
the improvement comprising a radiation-transmissive, dye migration-inhibiting layer interposed between the reagent layer and the porous radiation-blocking layer, said dye migration-inhibiting layer being permeable to said analyte and inhibiting the migration of said dye to said porous radiation-blocking layer upon contact of said element with the liquid under analysis.
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4. 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, a spreading layer permeable to said analyte, and a porous radiation-blocking layer, permeable to said analyte and interposed between said reagent layer and said spreading layer;
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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5. In an element for the analysis of liquids, said element comprising a radiation-transmissive support having thereon 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 dye, and an outermost radiation-blocking spreading layer permeable to said analyte;
the improvement comprising a radiation-transmissive, dye migration-inhibiting layer interposed between the reagent layer and the radiation-blocking spreading layer, said dye migration-inhibiting layer being permeable to said analyte and inhibiting the migration of said dye to said radiation-blocking spreading layer upon contact of said element with the liquid under analysis. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. In an element for the analysis of liquids, said element comprising a radiation-transmissive support having thereon 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 dye, and an outermost radiation-blocking spreading layer permeable to said analyte;
the improvement comprising a radiation-transmissive, dye migration-inhibiting layer interposed between the reagent layer and the radiation-blocking spreading layer, said dye migration-inhibiting layer being permeable to said analyte and comprising a hydrophilic colloid and a mordant for said dye. - View Dependent Claims (13, 14)
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15. In an element for the analysis of liquids, said element comprising a radiation-transmissive support having thereon a radiation-transmissive reagent layer permeable to a predetermined analyte, which layer comprises a hydrophilic colloid, said colloid having distributed therein a composition that is interactive in the presence of said analyte to provide a dye;
- and an outermost radiation-blocking spreading layer, permeable to said analyte, comprising a finely-divided particulate pigment and a blushed polymer;
the improvement comprising a radiation-transmissive dye migration-inhibiting layer, interposed between the reagent layer and the radiation-blocking spreading layer, said dye migration-inhibiting layer being permeable to said analyte and comprising a mordant for said dye and a hydrophilic colloid. - View Dependent Claims (16, 17)
- and an outermost radiation-blocking spreading layer, permeable to said analyte, comprising a finely-divided particulate pigment and a blushed polymer;
Specification