Abstract
Murine monoclonal antibodies (McAbs) with specificity for subclass-specific or subclass-restricted determinants on human IgG have been coupled to Sepharose to generate affinity columns. The judicial use of positive and negative chromatography and the exploitation of the special properties of individual McAb affinity columns has allowed the preparation of individual IgG subclasses from polyclonal IgG containing less than 1% contamination by any other IgG subclass. The specificity of the antibodies present in each polyclonal IgG subclass preparation has been assayed against a bacterial toxoid (tetanus), 2 bacterial cell wall antigens ( E. coli and pneumococcal) and coat antigen(s) of a DNA virus (CMV). Antibodies were predominantly IgG1 to tetanus toxoid, IgG2 to pneumovax and E. coli cell walls, and IgG1, 2 and 3 to CMV coat antigens.
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