Protein A purification is a process for isolating the IgG type of immunoglobulin protein from a complex mixture. The starting material is usually but not limited to polyclonal antisera, tissue culture supernatant, or ascites fluid. Typically protein A purification is performed when IgG enrichment is desired, and is often used to purify IgG prior to conjugation to a reporter molecule. The IgG is bound to an immobilized Protein A matrix, non-IgG impurities are wased away, lastly the IgG fraction is eluted and recovered. Rockland's Protein A purification process is ideal to recover a highly active IgG fraction from complex starting material.