The Effect of Conductivity on Dynamic Binding Capacity on CEX Resins

In an effort to improve the antibody manufacturing platform, newer Cation Exchange Resins were evaluated. Dynamic binding studies were conducted using 2 different monoclonal antibodies at a stable pH and varying conductivities across nine resins to determine the differences in binding capacity. DBC Studies were performed at a pH of 5 and conductivities of 5, 10 and 15 mS/cm for the nine cation exchange resins with breakthrough criteria set at 10%. While most of the resins provided excellent binding capacity (>50 g/L), the impact of conductivity on the dynamic binding capacity was shown to be very molecule dependent and varied significantly with the resin type.