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Purified immunoglobulin (Ig) preparations are isolated from pooled normal serum by a proprietary chemical fractionation method. The immunoglobulin preparations are supplied as a lyophilized powder. Purity levels are >97% IgG as analyzed by SDS-Page. These preparations are especially useful as a co-precipitant in RIA methods employing polyethylene glycol or ammonium sulfate precipitation steps, or as a protein stabilizer or blocker in a number of immunoassays. These preparations are also useful as IgG control solutions for biochemical analytical tests. Immunoglobulin preparations reconstitute to pH 7.2 ± 0.2. For use in research and manufacturing only. Not intended for direct use in diagnostic or therapeutic applications