Antibody Aggregate Removal Using a Mixed-Mode Chromatography Resin

Viral removal by column chromatography in downstream processing of monoclonal antibodies

For monoclonal antibodies (mAbs) produced in mammalian cells, viral safety is a critical concern. The downstream process, in addition to removing other impurities, needs to ensure robust clearance (removal or inactivation) of potential endogenous and adventitious viruses. In general, Protein A and polishing chromatography steps all can provide certain level of virus removal. Chromatographic removal combined with virus inactivation and nanofiltration usually provides adequate virus clearance across the overall downstream process. This article reviews the virus clearance capability of commonly used column chromatography, with attention to possible interference of virus-mAb interaction on virus removal. In addition, the potential of using viral surrogate as a safe alternative to live virus for assessing viral clearance is briefly discussed.

Evaluating a new mixed-mode resin Diamond MMC Mustang using Capto MMC ImpRes as a benchmark

Diamond MMC Mustang is a relatively new mixed-mode resin, which mediates both cation exchange and hydrophobic interactions. In this work, we evaluated this resin using Cytiva's Capto MMC ImpRes, a well-established mixed-mode resin with similar properties, as a benchmark. The data suggest that in comparison with Capto MMC ImpRes, Diamond MMC Mustang exhibits comparable binding capacity and resolution. In addition, the resin under evaluation shows good lot-to-lot consistency. The information provided in this study allows users to have additional options when selecting mixed-mode resin for intermediate purification or final polishing, which is favourable especially at the present time when the supply chains of many manufacturers are negatively impacted by the coronavirus pandemic.