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Quasi-elastic light scattering (QLS) was used to determine relative epitope specificities of a group of anti-bovine serum albumin (BSA) monoclonal antibodies (MAb). QLS is a non-invasive technique which can determine the mean size and size distributions of macromolecular scatterers by analysis of the fluctuations in the intensity of laser light scattering. When two MAbs are mixed together with antigen, QLS detects the complex formation which results from the Ag-Ab reaction, and can easily distinguish between the large complexes formed by interaction of non-competitive MAbs and the smaller complexes formed by competitive MAbs. In this report, the competitive or non-competitive behavior of six anti-BSA MAbs were assessed by radioimmunoassay (RIA) and QLS analysis. The results obtained by QLS analysis confirmed the RIA findings indicating that the six MAbs examined can be categorized into three distinct, non-interacting groups. QLS analysis represents a simple, and extremely rapid technique for epitope mapping studies.
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