While the low IgG BSA (Cat.#02199897) has an IgG limit of up to 50 ppm, in certain applications this level becomes an antigen for cross-reacting secondary antibodies Its presence can alter precious experimental data, resulting in reduced purification yields These levels may also be problematic for certain recombinant protein or monoclonal antibody purification processes For such applications, MP Bio NZ offers an ultra-low IgG grade of BSA where the IgG content is brought down to as low as 4 ppm