Stable test strips having a water-soluble paper layer and methods for making same

• US 4,061,468 A
• Filed: 07/01/1975
• Issued: 12/06/1977
• Est. Priority Date: 07/30/1974
• Status: Expired due to Term

• Current Assignee: Boehringer Mannheim GmbH (Roche Holding AG)
• Original Assignee: Boehringer Mannheim GmbH (Roche Holding AG)
• Inventors: Werner, Wolfgang, Rittersdorf, Walter, Rieckmann, Peter, Lange, Hans, Rey, Hans-Georg
• Primary Examiner(s): Yudkoff, Norman
• Assistant Examiner(s): Hollander, Barry I.
• Application Number:
  US05/592,295
• Time in Patent Office: 889 Days
• Field of Search: 23/253 TP, 23/230 B, 162/140, 106/93, 428/212, 428/535, 427/209
• US Class Current: 422/421
• CPC Class Codes: G01N 33/521 Single-layer analytical elements
• CPC Class Codes: Y10T 428/31982 Wood or paper
• CPC Class Codes: Y10T 436/173076 Nitrite or nitrate
• CPC Class Codes: Y10T 436/200833 Carbonyl, ether, aldehyde or ketone containing

Abstract

Stable test strips for the detection of components in liquids, for example blood, ketone bodies and nitrates in urine, includes two indicator layers one of which is a water-soluble paper.

Claims

1. Stable test strip for the detection of a component in an aqueous liquid comprising two indicator layers containing at least one reagent in each layer, said reagents forming, upon contact with the liquid containing said component, a color detectable throughout said strip, wherein one of said indicator layers is a water soluble paper.

2. Test strip of claim 1 wherein the water-soluble paper comprises fibers selected from the group consisting of methyl cellulose and an alkali metal salt of carboxymethyl cellulose.

3. Test strip of claim 2 wherein the water-soluble paper contains additional fibers.

4. Test strip of claim 3 wherein the additional fibers are cellulose fibers.

5. Test strip of claim 1 wherein the water-soluble paper has a surface weight of 10-100 g/m².

6. Test strip of claim 5 wherein the water-soluble paper has a surface weight of 25-60 g/m².

7. Test strip of claim 1 wherein the other indicator layer is a water-insoluble layer selected from the group consisting of absorbent paper and fleece.

11. Test strip of claim 1 wherein the two indicator layers are placed on top of one another and sealed between a synthetic resin film and a fine meshed material.

12. Test strip of claim 1 wherein the non-water-soluble indicator layer is adhered to a synthetic resin strip and the water-soluble paper is attached thereto.

8. Stable test strip for the detection of blood in urine comprising two indicator layers which are each impregnated with reagents for the detection of blood, said reagents forming upon contact with said blood-containing urine, a color detectable throughout said strip, one of said indicator layers being a water-soluble paper.

9. Stable test strip for the detection of ketone bodies in urine comprising two indicator layers which are each impregnated with reagents for the detection of ketone bodies, said reagents forming upon contact with the ketone body-containing urine, a color detectable throughout said strip, one of said indicator layers being a water-soluble paper.

10. Stable test strip for the detection of nitrate in urine comprising two indicator layers which are each impregnated with reagents for the detection of nitrate, said reagents forming upon contact with said nitrate-containing urine, a color detectable throughout said strip, one of said indicator layers being a water soluble paper.

13. Process for the production of stable test strips for the detection of component materials in an aqueuous liquid, which comprises impregnating two indicator layers individually, each with at least one detection reagent, one of said indicator layers being a water-soluble paper, drying said layers and uniting same to form said test strip.