An antigen or antibody and an immunochemically neutral protein are immobilized in two stages on a microporous membrane coated with a protein such as zein or collagen. Immobilized antigen to Toxoplasma gondii is used in an immunoassay to detect the presence of antibody to Toxoplasma gondii in serum. Antibody...http://www.google.com.au/patents/US4407943?utm_source=gb-gplus-sharePatent US4407943 - Immobilized antibody or antigen for immunoassay
