Monoclonal antibodies (MAbs) are very successful for treatment of several different cancers and tumors. However, the low tissue penetration has led to the development of smaller sized biopharmaceuticals (Ab fragments) such as Fabs, single chain Fv (scFv) and domain antibodies (Dabs). These molecules lack the Fc part of the antibody making a platform purification approach using Protein A impossible. However, with the introduction of the Protein L based affinity chromatography media (Captoâ„¢ L) new possibilities are introduced for capture of Dabs. By using high performance multimodal media for polishing, remaining contaminants are removed to trace levels. In this study a three-step process platform was developed for purification of Dab (Fig 2).