Patent ID: 8440799

Claim:
A method for purifying an anti-Aβ antibody having an Fc region from a source liquid comprising the antibody and one or more impurities, comprising the steps of: adsorbing the anti-Aβ antibody to an Fc binding agent comprising Protein A; washing the Fc binding agent to which the anti-Aβ antibody is adsorbed with a buffer solution containing CaCl 2 at a concentration of from 0.5 M to 3 M to remove one or more impurities; recovering the anti-Aβ antibody from the Fc binding agent by eluting the antibody using an elution buffer having a pH in a range from 2 to 4; and subjecting the anti-Aβ antibody recovered from the Fc binding agent to anion exchange chromatography.