A method for immunoassay of a viral antigen is performed on a membrane precoated with an inert protein. Nonimmunological capture of antigen takes place by absorption onto the coated membrane. Captured antigen binds to a tracer which includes a label conjugated to a specific antibody, the inert protein concomitantly inhibiting nonspecific binding of tracer. The label may be an enzyme which converts a substrate to a detectable product or converts a blocked inhibitor to an inhibitor whereby a second enzyme is inhibited from converting a substrate to a product. The invention includes a kit of materials for performing an assay in accordance with the method of the invention.
病毒抗原的免疫测定方法是在预先涂有惰性蛋白质的膜上进行的。抗原通过被涂膜吸收而被非免疫捕获。捕获的抗原与示踪剂结合,示踪剂包括与特异性
抗体结合的标签,惰性蛋白同时抑制示踪剂的非特异性结合。标签可以是一种酶,它能将底物转化为可检测的产物,或将被阻断的
抑制剂转化为
抑制剂,从而抑制第二种酶将底物转化为产物。本发明包括一套材料,用于按照本发明的方法进行检测。