Two decades of intensive development of novel expression systems for mammalian cells and microorganisms have led to a significant increase in fermentation titers in the biopharmaceutical production of proteins (more than 20 g/L in microbials and more than 4 g/L in mammalian cell culture). However, dynamic binding capacity of chromatography resins is often limited, and very large chromatography columns are needed to purify such large amounts of target proteins. New paths for cost-efficient purification are therefore needed, including downstream processing…