Purification of IgG by Precipitation with Sodium Sulfate or Ammonium Sulfate
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Addition of appropriate amounts of salts, such as ammonium or sodium sulfate, causes precipitation of IgG (1) from all mammals, and can be used for serum, plasma, ascites fluid, and hybridoma culture supernatant. Although such IgG is usually contaminated with other proteins, the ease of these precipitation procedures coupled with the high yield of IgG has led to their wide use in producing enriched IgG preparations. They are suitable for many immunochemical procedures, e.g., production of immunoaffinity columns, and as a starting point for further purification. It is not suitable however for conjugating with radiolabels, enzymes, or biotin since the contaminating proteins will also be conjugated, thereby reducing the efficiency of the labeling and the quality of the reagent. The precipitated IgG is usually very stable, and such preparations are ideally suited for long-term storage or distribution and exchange between laboratories.
KeywordsSodium Sulfate Ammonium Sulfate Ascites Fluid Ammonium Sulfate Precipitation Saturated Ammonium Sulfate