Author Archives: Eric Bishop

Host Cell Protein Analysis: Immunoassays and Orthogonal Characterization By Antibody Affinity Extraction and Mass Spectrometry Methods

Reduction of Host Cell Proteins (HCPs) to the lowest levels practical requires sensitive and robust analytical methods. In this Special Report, Cygnus Technologies discusses industry best practices for HCP analysis and integration of orthogonal methods for in-depth HCP characterization using Antibody Affinity Extraction (AAE) and Mass Spectrometry (MS). Download the report to learn about: Antibody Affinity Extraction for HCP antibody coverage analysis to ensure HCP ELISA is broadly reactive and fit for purpose of process monitoring and product lot release…

Ask the Expert: Improving Host-Cell Protein Detection By Enriching Mass Spectrometry Samples

Enzyme-linked immunosorbent assays (ELISAs) remain the industry standard for process monitoring and lot-release testing for host-cell proteins (HCPs), but researchers need orthogonal tests to confirm that an ELISA is fit for purpose. On 22 April 2020, Eric Bishop (vice president of research and development at Cygnus Technologies) delivered an “Ask the Expert” presentation about his company’s solution: mass spectrometry (MS) preceded by a novel Antibody Affinity Extraction (AAE) technique. Bishop explained that an AAE step can magnify a sample’s HCP…

Antibody Affinity Extraction Enables Identification of Host Cell Proteins by Mass Spectrometry

Host cell proteins (HCP) constitute a major group of impurities for biologic drugs produced using cell culture technology. Even at nanogram per milligram concentrations of HCP to drug substance (DS), HCPs can elicit undesired immune response, interfere with drug safety and efficacy, or impact DS stability. A broadly-reactive HCP ELISA should be used during the purification processes to ensure removal of HCPs and to demonstrate process consistency and final DS purity. Regulatory authorities are requesting biopharmaceutical companies employ orthogonal methods…