Author Archives: Patrick Endres

Reduce Downstream Processing Costs for MAbs By Switching to a Two-Step Platform

Downstream processing operations make up to 80% of the total costs for processing biotherapeutics. Given the current drive to reduce downstream costs, chromatographers and process engineers will need to streamline processes. Herein, we describe the benefits offered by using Tosoh’s two-step process for purifying monoclonal antibodies (MAbs) and compare that method with the standard industrial process. By combining high-performance protein A capture and a single polishing step on salt-tolerant anion-exchange resin, Tosoh’s approach can reduce downstream costs by 45% and…

Tosoh LenS3™ MALS Detector: A New Paradigm in Light-Scattering Technology

The multi-angle light scattering (MALS) technique has become the standard for determining molecular weight (MW) and size (radius of gyration, Rg) of proteins, biopolymers, synthetic polymers, and polysaccharides. By combining an extreme low angle (low-angle light scattering (LALS) – 10°) and an extreme high angle (high-angle light scattering (HALS) – 170°) with a right angle (right-angle light scattering (RALS) – 90°) to form a three-angle MALS detector, the new LenS3 detector can determine directly absolute molecular weight and Rg without…

Antibody–Drug Conjugate Surrogate Purification: TOYOPEARL® PPG-600M HIC Resin for DAR-Separation

Antibody–drug conjugates (ADCs) are promising biopharmaceuticals. They combine the high selectivity and affinity to cancer cells with the toxicity of chemotherapeutics in one molecule. ADCs consist of a monoclonal antibody covalently bound by a linker to a highly potent cytotoxic drug. ADC-surrogates contain a nontoxic payload with similar structure and physiochemical properties as the toxic payload of an ADC. Therefore, they can be used as models to develop suitable purification processes or analytical methods. The ADC-surrogate in this work consists…