申请人:KONICA CORPORATION
公开号:EP0328106A2
公开(公告)日:1989-08-16
Disclosed is a method of assaying a target substance in a fluid sample. In this method, a) the target substance, b) a substance which specifically binds to the target substance, to which a biological active substance which does not bind to the target substance is attached, or to which a substance which specifically binds to a biological active substance which does not bind to the target substance is attached; c) a labelled substance which is the target substance or an analogue thereof labelled with β-D-galactosidase, or which is a substance which specifically binds to the target substance, labelled with β-D-galactosidase, d) a substance which specifically binds to the biological active substance and which does not bind to the target substance, or the biological active substance, which is fixed to a carrier, which carrier exists in a porous reaction layer of an assay element, and e) a substance which specifically binds to β-D-galactosidase and which changes a signal originated from β-D-galactosidase, which is fixed to said carrier or another carrier which exists in a porous reaction layer of an assay element are reacted and the change of the signal from β-D-galactosidase is measured.
本发明公开了一种检测流体样品中目标物质的方法。在该方法中,a) 目标物质;b) 与目标物质特异性结合的物质,其上附有不与目标物质结合的生物活性物质,或附有与不与目标物质结合的生物活性物质特异性结合的物质;c) 标记物质,该标记物质是标记有β-D-半乳糖苷酶的目标物质或其类似物,或 是标记有β-D-半乳糖苷酶的能与目标物质特异性结合的物质; d) 能与生物活性物质特异性结合但不能与目标物质或生物活性物质结合的物质,该物 质固定在载体上、e) 一种能与β-D-半乳糖苷酶特异性结合的物质,它能改变来自β-D-半乳糖苷酶的信号,该物质固定在所述载体上或存在于检测元件多孔反应层中的另一种载体上,两者发生反应,并测量来自β-D-半乳糖苷酶的信号的变化。