Test device resistant to cross contamination between reactant areas and process for making it
First Claim
1. In a test device for analyzing a test sample for the presence of one or more constituents, the device comprising a base support member, a hydrophobic layer affixed to the support member, and two or more reagent compositions affixed to the hydrophobic layer, each respectively responsive to a particular sample constituent or concentration thereof, the improvement wherein said hydrophobic layer comprises finely divided silica particles having covalently affixed to the surfaces thereof groups having the structure
wherein said R substituents, same or different, are hydrogen, lower alkyl, or aryl; and
a suitable binder.
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Abstract
A test device for detecting the presence of constituents in a liquid test sample, and method for preparing it are disclosed. The device comprises a base support member coated with a hydrophobic barrier layer onto which is affixed a plurality of spaced apart reagents respectively responsive to different constituents of the test sample. The barrier layer comprises finely divided silica particles, to the surface of which are randomly covalently bound groups having the structure
--O--SiR.sub.3
wherein the R substituents, same or different, are hydrogen, lower alkyl or aryl.
42 Citations
13 Claims
- 1. In a test device for analyzing a test sample for the presence of one or more constituents, the device comprising a base support member, a hydrophobic layer affixed to the support member, and two or more reagent compositions affixed to the hydrophobic layer, each respectively responsive to a particular sample constituent or concentration thereof, the improvement wherein said hydrophobic layer comprises finely divided silica particles having covalently affixed to the surfaces thereof groups having the structure
- space="preserve" listing-type="equation">--O--SiR.sub.3
wherein said R substituents, same or different, are hydrogen, lower alkyl, or aryl; and
a suitable binder.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for preparing a test device capable of determining the presence of a constituent in a test sample wherein the device has the property of eliminating the occurrence of runover, the method comprising the steps of
preparing a hydrophobic coating material comprising (a) finely divided silica particles having covalently affixed thereto groups having the structure -O-SiR3, wherein the R substituents, same or different, are hydrogen, lower alkyl or aryl, and (b) a suitable binder, affixing the hydrophobic coating material to a base support member to form a hydrophobic layer on the support member, and affixing to the hydrophobic layer a reagent capable of producing a detectable response in the presence of the test sample constituent.
Specification