Method for carrying out immunodiagnostic tests
First Claim
1. In an immunoassay comprising contacting a macroporous membrane to which an enzyme or antibody is absorbed with a liquid putatively containing an antigen and detecting the presence of the antigen, the improvement comprising utilizing as the macroporous membrane a macroporous filler-containing membrane where the membrane is prepared by (1) forming an unstable mixture of at least two polymers which are immisible in solution,(2) dispersing insoluble fillers into the unstable mixture of such immisible polymers thereby converting the mixture into a stable homogeneous mixture, and(3) applying such stable mixture to a substrate as a casting solution by precipitation coagulation.
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Abstract
Immunodiagnostic tests in which enzymes or antibodies are bound to porous carrier materials can be carried out by employing as porous carrier materials macroporous polymer membranes which are prepared by
(a) dispersing an insoluble filler in a solution which contains at least two incompatible polymers in amounts which lead to phase separation in the solution, resulting in a homogeneous casting solution, and
(b) applying this solution to a support and carrying out a precipitation coagulation.
52 Citations
13 Claims
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1. In an immunoassay comprising contacting a macroporous membrane to which an enzyme or antibody is absorbed with a liquid putatively containing an antigen and detecting the presence of the antigen, the improvement comprising utilizing as the macroporous membrane a macroporous filler-containing membrane where the membrane is prepared by (1) forming an unstable mixture of at least two polymers which are immisible in solution,
(2) dispersing insoluble fillers into the unstable mixture of such immisible polymers thereby converting the mixture into a stable homogeneous mixture, and (3) applying such stable mixture to a substrate as a casting solution by precipitation coagulation.
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8. The method of claim 8, wherein bisulphite adducts of isocyanates are employed for the covalent binding of the enzymes or antibodies to the free amino groups on the surface of said macroporous membrane.
Specification