Author Archives: John Bishop


Science, Risks, and Regulations: Current Perspectives on Host Cell Protein Analysis and Control

State-of-the-art analytics guide process development by providing companies with thorough understanding, effective removal, suitable control, and comparability assessment after process changes of host cell proteins (HCPs) in recombinant biotechnology products. An array of analytical techniques and approaches can be used to establish control strategies for host cell proteins. Techniques used for HCP characterization and comparability include two-dimensional (2D) gel electrophoresis with a range of stains, 2D immunoblotting, 2D high-performance liquid chromatography (HPLC), 2D difference gel electrophoresis (DIGE), and increasingly mass…


CMC Strategy Forum Special Focus Series: Part 2 Product-Related Impurities, An Overview

Introduction by Cheryl Scott The CMC Strategy Forums focus on relevant chemistry, manufacturing, and controls (CMC) issues throughout the life cycle of a therapeutic and thereby foster collaborative technical and regulatory interaction. Forum chairs share information with regulatory agencies to help them merge good scientific and regulatory practices. Outcomes of forum meetings are published in BioProcess International and on the CASSS website. This process is meant to help ensure that biopharmaceutical products manufactured with advancing technologies in a regulated environment…