Protein A is a commonly used antibody purification reagent due to its high affinity for the Fc fragment of IgG. However, this affinity could lead to Protein A shedding during the purification process leading to elevated Protein A levels over safety limits.

 Our Protein A ELISA Kit (Cat. No. RES-A024) is a complete assay kit for quantifying residual Protein A in your samples. It can be used for process optimization during antibody purification, evaluating key quality parameters, and detecting residual Protein A levels in intermediate and final products.