Test carrier for the analytical determination of a component of a liquid sample
First Claim
1. Test carrier useful in determining a component of a liquid sample, comprising:
- (a) a base layer having positioned thereon,(i) a sample application region;
(ii) an evaluation region;
(b) a liquid transport path which extends from the sample application region into said evaluation region,(c) a plurality of test layers, comprising a color forming layer positioned in the evaluation region of said liquid transport path, said color forming layer having a surface facing away from said base layer and containing at least one color forming reagent, and(d) an absorbent covering layer positioned above said surface of the color forming layer facing away from said base layer, wherein said absorbent covering layer is in fluid contact with said liquid transport path, and said absorbent covering layer when wet permits visualization of color in said color forming layer but is non-transparent to, wherein the color forming layer and the absorbent covering layer are arraigned as the last section of the liquid transport path said color when dry.
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Abstract
A test carrier for the analytical determination of a component of a liquid sample, especially for the diagnosis of diseases, by means of a reaction sequence taking place on the test carrier with several test layers, which, in the initial state, are dry and, in the case of using the sample liquid, are wetted, comprising a base layer on which are present next to one another a sample application region and an evaluation region, a liquid transport path which extends from the sample application region into the evaluation region and a color-forming layer in which, on the basis of a color-formation reaction with the help of a color-forming reagent system, at least one color-forming reagent of which is present in the color-forming layer, there takes place an optically detectable change characteristic for the component to be determined. In the evaluation region above the surface of the color-forming layer facing away from the base layer, there is arranged an absorbent covering layer which, in the initial state of the test carrier, is so non-transparent that the color of the color-forming layer is not visible. The covering layer is in fluid contact with the liquid transport path and the covering layer and the color-forming layer are formed in such a manner that the color of the color-forming reagent becomes visible when both layers are wetted by the sample liquid.
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Citations
11 Claims
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1. Test carrier useful in determining a component of a liquid sample, comprising:
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(a) a base layer having positioned thereon, (i) a sample application region; (ii) an evaluation region; (b) a liquid transport path which extends from the sample application region into said evaluation region, (c) a plurality of test layers, comprising a color forming layer positioned in the evaluation region of said liquid transport path, said color forming layer having a surface facing away from said base layer and containing at least one color forming reagent, and (d) an absorbent covering layer positioned above said surface of the color forming layer facing away from said base layer, wherein said absorbent covering layer is in fluid contact with said liquid transport path, and said absorbent covering layer when wet permits visualization of color in said color forming layer but is non-transparent to, wherein the color forming layer and the absorbent covering layer are arraigned as the last section of the liquid transport path said color when dry. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification