Immunoblotting Using Radiolabeled Reagents for Detection.

Development of immunoblots is commonly performed using enzyme-labeled antibodies which convert soluble substrates into insoluble colored products. A simple, rapid, and sensitive alternative method which produces low background and allows a rapid quantitative evaluation is the use of radiolabeled antibodies or protein A conjugates. Here we describe the use of iodinated secondary antibodies for immunodetection of an autoantigen during HPLC purification.