Various unit operations are needed in downstream processing (DSP) of biologics to remove process‑related impurities such as host‑cell proteins, nucleic acids, viruses, and endotoxins. This application note describes the potential of a salt‑tolerant anion‑exchange resin to achieve outstanding clearance of endotoxins and viruses. Introduction Endotoxins are lipopolysaccharides (LPS) originating from cell membranes of Gram‑negative bacteria. They are frequent contaminants of recombinant proteins produced in microbial expression systems. On the other hand, expression of more complex proteins in eukaryotic systems carries…