In the development of biotherapeutics, a thorough understanding of a molecule’s product quality attributes (PQAs), and their effect on various structure-function relationships and long-term stability, is essential for ensuring the safety and efficacy of the product. At present, numerous routine chromatographic and electrophoretic assays are used to characterize and monitor individual PQAs. However, execution of multiple routine methods for batch release, stability time-points, and process/formulation development support becomes time and resource intensive, and often provides an indirect measure of biologically relevant PQAs. Introduced in 2015, the multi-attribute method (MAM), based on LC-MS peptide mapping and automation principles, provides simultaneous and site-specific detection, identification, quantitation, and quality control (monitoring) of PQAs.

A dedicated Pfizer team has been regularly employing MAM on an in-house MAM platform to support biotherapeutic process and product development. In parallel, this team has continually explored and implemented improvements in the Pfizer MAM platform, including sample preparation and data processing automation, to move toward the next generation of MAM. Recently, a pre-commercial demo model of the new Thermo Scientific Orbitrap Exploris MX mass detector was evaluated in-house by the Pfizer MAM team. Here, the results of the evaluation and an assessment of the Orbitrap Exploris MX mass detector’s suitability as a next generation MAM instrument are presented.


  • Pfizer MAM platform milestones for characterization and routine monitoring
  • Automation of sample handling and data processing and reporting
  • Evaluation and optimization of the Orbitrap Exploris MX mass detector for MAM

About the presenter

Andrew W. Dawdy, Ph.D., Principal Scientist, BioTherapeutics Pharmaceutical Sciences Pfizer, Inc.

Andrew W. Dawdy, Ph.D., Principal Scientist, BioTherapeutics Pharmaceutical Sciences Pfizer, Inc.

Andrew received his Ph.D. degree in Chemistry from the University of Virginia in 2013 where he performed research in protein MS. Andrew has spent the last seven years working in pharmaceutical development, with the last five of those developing biotherapeutics at the Pfizer St. Louis, MO site. As a principal scientist in Pfizer’s mass spectrometry and biophysical characterization (MSBC) laboratory, Andrew supports development of a variety of modalities, including mAbs, ADCs, fusion proteins, and recombinant proteins. Andrew is on the front line in the development and implementation of online ion-exchange mass spectrometry (IEX/MS) and multi-attribute method (MAM) at Pfizer, having made respective presentations at ASMS 2018 and 2019, as well as co-leading evening workshops on the topics.

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