Development of a simplified method for subclass isotyping and screening monoclonal antibodies

A simplified dot-blot procedure for screening and subclass isotyping of monoclonal antibodies is described in which only 0.5-50 ng of antigen and 1 microliter of antibody are needed to perform the test. The results on the nitrocellulose membrane can be stored indefinitely for future reference. This method is less expensive, uses smaller quantities of antigen and antibody, and is faster than presently used enzyme-linked immunosorbent assay techniques or other dot-blot methods. Monoclonal antibodies against Mycoplasma gallisepticum were screened and isotyped using this technique.