An immunoassay for measuring the concentration of a ligand contained in a solid-phase complex prepared by immobilizing said ligand, comprising the steps (1) and (2) or the steps (1') and (2'):
(1) contacting a ligand, a first labeled substance binding specifically to said ligand and a second labeled substance binding specifically to said ligand with one another in a solvent to form a complex of said first labeled specifically binding substance, said ligand and said second labeled specifically binding substance; and
(2) contacting said complex with carrier solid-phase particles supporting a substance binding specifically to the first marker of said first labeled specifically binding substance to form a solid-phase complex in which said complex and said carrier solid-phase particles are bound to each other by the first marker, or
(1') contacting a ligand, a first labeled substance binding specifically to said ligand and a second labeled substance binding specifically to said first labeled specifically binding substance with one another in a solvent to form a mixture of a complex of said first labeled specifically binding substance and said ligand and a complex of said first labeled specifically binding substance and said second labeled specifically binding substance; and
(2') contacting said complex mixture with carrier solid-phase particles supporting a substance binding specifically to the first marker of said first labeled specifically binding substance to form a solid-phase complex mixture in which said complexes and said carrier solid-phase particles are bound to each other by the first marker.
According to the above immunoassay, the amount of said ligand to be measured can be determined at a high repeatability and a high sensitivity in a short period of time.
一种免疫测定法,用于测量通过固定
配体制备的固相络合物中所含
配体的浓度,包括步骤(1)和(2)或步骤(1')和(2'):
(1) 将
配体、与所述
配体特异性结合的第一标记物质和与所述
配体特异性结合的第二标记物质在溶剂中相互接触,以形成所述第一标记特异性结合物质、所述
配体和所述第二标记特异性结合物质的复合物;以及
(2) 将所述复合物与支持与所述第一标记的特异性结合物质的第一标记物特异性结合的物质的载体固相颗粒接触,以形成固相复合物,其中所述复合物和所述载体固相颗粒通过第一标记物相互结合,或
(1')将
配体、与所述
配体特异性结合的第一标记物质和与所述第一标记特异性结合物质特异性结合的第二标记物质在溶剂中相互接触,以形成所述第一标记特异性结合物质和所述
配体的复合物以及所述第一标记特异性结合物质和所述第二标记特异性结合物质的复合物的混合物;以及
(2')将所述复合物混合物与支持与所述第一标记的特异性结合物质的第一标记物特异性结合的物质的载体固相颗粒接触,以形成固相复合物混合物,其中所述复合物和所述载体固相颗粒通过第一标记物相互结合。
根据上述免疫测定方法,可以在短时间内以高重复性和高灵敏度测定所述
配体的待测量。