title: A sensitive micro-immunoassay using beta-galactosidase/anti-beta-galactosidase complexes.
abstract: This paper describes a new sensitive microELISA based on enzyme/anti-enzyme complexes following an unlabelled antibody bridging step. beta-Galactosidase/anti-beta-galactosidase complexes were made using a monoclonal antibody raised against bacterial (E. coli) beta-galactosidase and enzyme activity was quantified with a fluorogenic substrate. Because of its high sensitivity the assay is particularly suitable for the detection of limited amounts of antigen. One application illustrated is the analysis of Class I and Class II histocompatibility antigens on peripheral blood lymphocytes using 5000 cells/well in 60-well Terasaki or 96-well microtitre plates.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D000936:Antigen-Antibody Complex; D004926:Escherichia coli / Q000201:enzymology*; D005696:Galactosidases / Q000032:analysis*; D007118:Immunoassay / Q000379:methods; D051379:Mice; D008807:Mice, Inbred BALB C; D008832:Microchemistry; D001616:beta-Galactosidase / Q000032:analysis*
chemical_list: D000911:Antibodies, Monoclonal; D000936:Antigen-Antibody Complex; D005696:Galactosidases; D001616:beta-Galactosidase