The reactivity of the antiserum is directed to the Fc and Fab subunits of both subclasses, IgG1 and IgG2. It includes a certain degree of reactivity with other immunoglobulins via the common Fab portion. In immunoelectrophoresis against goat serum a single characteristic precipitin line with a spur is usually obtained, representing primarily IgG2. If the IgG1 level in the sample approaches the concentration of IgG2, it may become visible as a second precipitin line. It does not react with any non-Ig protein in goat serum, as tested by immunoelectrophoresis and double radial immunodiffusion. In immunoelectrophoresis and double radial immunodiffusion to identify the presence of IgG; as secondary antibody to precipitate the immunoglobulin in normal goat serum; to prepare an immunoadsorbent for the production of Ig-free goat serum, plasma or non-Ig preparations. This antiserum is not intended for use in non-precipitating antibody-binding or other highly sensitive assays. For such uses labelled and unlabelled cytochemical and immunoassay reagents meeting the necessary additional specificity and performance requirements are available.
Inter-species cross-reactivity is a normal feature of antibodies to immunoglobulins, since Ig of different species frequently share antigenic determinants. Cross-reactivity of this antiserum has been tested in double radial immunodiffusion with the following results:
bovine ++ guinea pig
Immunoprecipitation. In immunoelectrophoresis use 2 _l or equivalent against 120 _l antiserum. In double radial immunodiffusion (Ouchterlony) use a rosette arrangement with 10 _l antiserum in a 3 mm diameter centre well and 2 _l serum samples (neat and diluted) in 2 mm diameter peripheral wells. Precipitin titre not less than 1:128 when tested against normal goat serum in agar block titration.
Fields of Interest
Delipidated, heat inactivated lyophilized stable whole serum. No preservative added, as it may interfere with the antibody activity. No foreign protein added. Total protein and IgG concentration in the antiserum are comparable to those of pooled donkey serum. No foreign proteins added.
The lyophilized antiserum is shipped at ambient temperature and may be stored at +4