Messung des klassenspezifischen Antikörper- und Immunoglobulingehaltes in Colostrumseren von proteinimmunisierten Rindern*

Divergent results in radial immunodiffusion with antisera differing in precipitation properties with respect to individual immunoglobulin subclass. II. The antiserum factor

Differences in the antibody composition of antisera influence results obtained by radial immunodiffusion. If more than one subclass of the same immunoglobulin class is present in an antigen mixture, the occurrence of one or more subclass specific antibody species in antisera used for radial immunodiffusion leads to the production of precipitation rings smaller than rings produced by comparable antisera without subclass activity. The presence of antibodies against common immunoglobulin determinants only leads to production of larger precipitation areas. If one or more subclass specific antibody species are present in the antiserum this may further lead to production of double precipitation rings in radial immunodiffusion, depending on the subclass ratio in the antigen mixture. The production of antisera suitable for radial immunodiffusion is discussed.

Divergent results in radial immunodiffusion with antisera differing in precipitation properties with respect to individual immunoglobulin subclass. I. The antigen factor

Two bovine IgG subclasses were used as reference antigens to study subclass influence on radial immunodiffusion results with total bovine IgG. In combination with some of eight anti-bovine IgG sera tested the use of the same antiserum with one subclass furnished values which were about twice as high as values obtained with the other subclass. It is concluded that immunoglobulin determinations by radial immunodiffusion are influenced by the chosen reference antigen and by subclass ratios in the samples tested. The composition of immunoglobulin subclass mixtures for testing antisera used in radial immunodiffusion is discussed.