1
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Evans AR, Mulholland J, Lewis MJ, Hu P. Targeted CQA analytical control strategy for commercial antibody products: Replacing ion-exchange chromatography methods for charge heterogeneity with multi-attribute monitoring. MAbs 2024; 16:2341641. [PMID: 38652517 DOI: 10.1080/19420862.2024.2341641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2024] [Accepted: 04/08/2024] [Indexed: 04/25/2024] Open
Abstract
Peptide mapping with mass spectrometry (MS) is an important tool for protein characterization in the biopharmaceutical industry. Historically, peptide mapping monitors post-translational modifications (PTMs) of protein products and process intermediates during development. Multi-attribute monitoring (MAM) methods have been used previously in commercial release and stability testing panels to ensure control of selected critical quality attributes (CQAs). Our goal is to use MAM methods as part of an overall analytical testing strategy specifically focused on CQAs, while removing or replacing historical separation methods that do not effectively distinguish CQAs from non-CQAs due to co-elution. For example, in this study, we developed a strategy to replace a profile-based ion-exchange chromatography (IEC) method using a MAM method in combination with traditional purity methods to ensure control of charge variant CQAs for a commercial antibody (mAb) drug product (DP). To support this change in commercial testing strategy, the charge variant CQAs were identified and characterized during development by high-resolution LC-MS and LC-MS/MS. The charge variant CQAs included PTMs, high molecular weight species, and low molecular weight species. Thus, removal of the IEC method from the DP specification was achieved using a validated LC-MS MAM method on a QDa system to directly measure the charge variant PTM CQAs in combination with size exclusion chromatography (SE-HPLC) and capillary electrophoresis (CE-SDS) to measure the non-PTM charge variant CQAs. Bridging data between the MAM, IEC, and SE-HPLC methods were included in the commercial marketing application to justify removing IEC from the DP specification. We have also used this MAM method as a test for identity to reduce the number of QC assays. This strategy has received approvals from several health authorities.
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Affiliation(s)
- Adam R Evans
- Therapeutics Development & Supply - Analytical Development, Janssen Pharmaceuticals Research and Development, Malvern, PA, USA
| | - Joseph Mulholland
- Therapeutics Development & Supply - Analytical Development, Janssen Pharmaceuticals Research and Development, Malvern, PA, USA
| | - Michael J Lewis
- Therapeutics Development & Supply - Analytical Development, Janssen Pharmaceuticals Research and Development, Malvern, PA, USA
| | - Ping Hu
- Therapeutics Development & Supply - Analytical Development, Janssen Pharmaceuticals Research and Development, Malvern, PA, USA
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2
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Millán-Martín S, Jakes C, Carillo S, Bones J. Multi-Attribute Method (MAM) Analytical Workflow for Biotherapeutic Protein Characterization from Process Development to QC. Curr Protoc 2023; 3:e927. [PMID: 37929772 DOI: 10.1002/cpz1.927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2023]
Abstract
The multi-attribute method (MAM) has emerged significantly in recent years to support biotherapeutic protein characterization from process development to the QC environment. MAM is a liquid chromatography mass spectrometry (LC-MS) based peptide mapping approach, which combines the benefits from liquid chromatography coupled to high resolution accurate mass mass spectrometry (LC-HRAM MS), enabling direct assessment of protein sequence and product quality attributes with site specificity. These product quality attributes may impact efficacy, safety, stability, and process robustness. MAM is intended to replace conventional analytical approaches as it offers a more streamlined strategy for parallel monitoring of multiple attributes in a single analysis with high sensitivity and confidence, and ultimately supports more robust Quality by Design (QbD) approaches and faster decision cycles for biotherapeutic development. MAM consists of three main stages. The first stage is sample digestion, which typically entails proteolytic digestion of the protein. The second stage is reversed-phase chromatographic separation of the generated peptides and detection by HRAM MS in two phases. During MAM Phase I (discovery phase), data-dependent acquisition (DDA) MS/MS is performed to enable confident identification of peaks and development of a peptide workbook. During MAM Phase II (monitoring phase), full MS acquisition is only carried out for the monitoring of predefined product quality attributes (PQAs). The third stage is data processing, which entails analysis and reporting for each of the two phases including evaluation of sequence coverage, assessment of PQAs and peptide workbook creation during phase I, and targeted monitoring of predefined product attributes and new peak detection (NPD) during phase II. The latter is a comparative analysis that uses a base peak alignment algorithm to determine any non-monitored differences between the LC-MS chromatograms of a test sample and a reference standard. © 2023 The Authors. Current Protocols published by Wiley Periodicals LLC. Basic Protocol 1: In-solution sample digestion Alternate Protocol: Automated sample digestion Basic Protocol 2: Reversed-phase chromatographic separation and detection by HRAM-MS (RPLC-HRAM MS) Basic Protocol 3: Data processing and reporting.
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Affiliation(s)
| | - Craig Jakes
- National Institute for Bioprocessing Research and Training, Dublin, Ireland
| | - Sara Carillo
- National Institute for Bioprocessing Research and Training, Dublin, Ireland
| | - Jonathan Bones
- National Institute for Bioprocessing Research and Training, Dublin, Ireland
- School of Chemical and Bioprocess Engineering, University College Dublin, Dublin, Ireland
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3
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Abstract
LC-MS based peptide mapping, i.e., proteolytic digestion followed by LC-MS/MS analysis, is the method of choice for protein primary structural characterization. Manual proteolytic digestion is usually a labor-intensive procedure. In this work, a novel method was developed for fully automated online protein digestion and LC-MS peptide mapping. The method generates LC-MS data from undigested protein samples without user intervention by utilizing the same HPLC system that performs the chromatographic separation with some additional modules. Each sample is rapidly digested immediately prior to its LC-MS analysis, minimizing artifacts that can grow over longer digestion times or digest storage times as in manual or automated offline digestion methods. In this report, we implemented the method on an Agilent 1290 Infinity II LC system equipped with a Multisampler. The system performs a complete digestion workflow including denaturation, disulfide reduction, cysteine alkylation, buffer exchange, and tryptic digestion. We demonstrated that the system is capable of digesting monoclonal antibodies and other proteins with excellent efficiency and is robust and reproducible and produces fewer artifacts than manually prepared digests. In addition, it consumes only a few micrograms of material as most of the digested sample protein is subjected to LC-MS analysis.
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Affiliation(s)
- Jason Richardson
- Process Development, Amgen Inc., One Amgen Center Drive, Thousand Oaks, California 91320, United States
| | - Zhongqi Zhang
- Process Development, Amgen Inc., One Amgen Center Drive, Thousand Oaks, California 91320, United States
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4
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Gervais A, Dirksen EHC, Pohl T, Bechtold-Peters K, Burkitt W, D'Alessio V, Greven S, Lennard A, Li X, Lössner C, Niu B, Reusch D, O'Riordan T, Shearer JW, Spencer D, Xu W, Yi L. Compliance and regulatory considerations for the implementation of the multi-attribute-method by mass spectrometry in a quality control laboratory. Eur J Pharm Biopharm 2023; 191:57-67. [PMID: 37582411 DOI: 10.1016/j.ejpb.2023.08.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Revised: 08/04/2023] [Accepted: 08/12/2023] [Indexed: 08/17/2023]
Abstract
Multi-attribute methods employing mass spectrometry are applied throughout the biopharmaceutical industry for product and process characterization purposes but are not yet widely accepted as a method for batch release and stability testing under the good manufacturing practice (GMP) regime, due to limited experience and level of comfort with the technical, compliance and regulatory aspects of its implementation at quality control (QC) laboratories. This article is the second part of a two-tiered publication aiming at providing guidance for implementation of the multi-attribute method by peptide mapping liquid chromatography mass spectrometry (MAM) in a QC laboratory. The first part [1] focuses on technical considerations, while this second part provides considerations related to GMP compliance and regulatory aspects. This publication has been prepared by a group of industry experts representing 14 globally acting major biotechnology companies under the umbrella of the European Federation of Pharmaceutical Industries and Associations (EFPIA) Manufacturing & Quality Expert Group (MQEG).
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Affiliation(s)
- Annick Gervais
- Analytical Development Sciences for Biologicals, UCB, Chemin du Foriest, 1420 Braine L'Alleud, Belgium.
| | - Eef H C Dirksen
- Analytical Development and Quality Control, Byondis, Microweg 22, 6545 CM, Nijmegen, the Netherlands
| | - Thomas Pohl
- Biologics Analytical Development, Novartis Pharma AG, Klybeckstrasse 141, CH-4057 Basel, Switzerland
| | - Karoline Bechtold-Peters
- Biologics Drug Product Development, Novartis Pharma AG, Klybeckstrasse 141, CH-4057 Basel, Switzerland
| | - Will Burkitt
- Biological Characterisation Product Development Sciences, UCB, 216 Bath Road, Slough SL1 3WE, UK
| | - Valerio D'Alessio
- Analytical Development & Innovation NBE, Merck Serono S.p.A, Via Luigi Einaudi, 11, 00012 Guidonia Montecelio - Rome, Italy
| | - Simone Greven
- Pharmaceuticals, Biological Development, Bayer AG, Friedrich-Ebert-Strasse 217-333, 42117 Wuppertal, Germany
| | - Andrew Lennard
- Amgen Ltd, 4 Uxbridge Business Park, Sanderson Road, Uxbridge, UB8 1DH, UK
| | - Xue Li
- Biologics Development, Bristol Myers Squibb, 1 Squibb Drive, New Brunswick, NJ 08901, USA
| | - Christopher Lössner
- Analytical Dev. Biologicals, Boehringer Ingelheim Pharma GmbH & Co. KG, Birkendorfer Straße 65, 88397 Biberach an der Riß, Germany
| | - Ben Niu
- Biotherapeutics, Bristol Myers Squibb, 4224 Campus Point Court, San Diego, CA 92121, USA
| | - Dietmar Reusch
- Pharma Technical Development, Roche Diagnostics GmbH, Nonnenwald 2, 82377 Penzberg, Germany
| | - Tomás O'Riordan
- Eli Lilly Kinsale Limited, Dunderrow, Kinsale, Co. Cork, P17NY71, Ireland
| | - Justin W Shearer
- Analytical Development, GSK, 709 Swedeland Road, King of Prussia, PA 19406, USA
| | - David Spencer
- BioPharmaceutical Development, Ipsen Biopharm Limited, 9 Ash Road, Wrexham Industrial Estate, Wrexham LL13 9UF, UK
| | - Wei Xu
- Analytical Sciences, BioPharmaceuticals R&D, AstraZeneca, One Medimmune Way, Gaithersburg, MD 20878, USA
| | - Linda Yi
- Analytical Development, Biogen, 5000 Davis Drive, Research Triangle Park, NC 27709, USA
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5
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Li X. Recent applications of quantitative mass spectrometry in biopharmaceutical process development and manufacturing. J Pharm Biomed Anal 2023; 234:115581. [PMID: 37494866 DOI: 10.1016/j.jpba.2023.115581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 06/27/2023] [Accepted: 07/12/2023] [Indexed: 07/28/2023]
Abstract
Biopharmaceutical products have seen rapid growth over the past few decades and continue to dominate the global pharmaceutical market. Aligning with the quality by design (QbD) framework and realization, recent advances in liquid chromatography-mass spectrometry (LC-MS) instrumentation and related techniques have enhanced biopharmaceutical characterization capabilities and have supported an increased development of biopharmaceutical products. Beyond its routine qualitative characterization, the quantitative feature of LC-MS has unique applications in biopharmaceutical process development and manufacturing. This review describes the recent applications and implications of the advancement of quantitative MS methods in biopharmaceutical process development, and characterization of biopharmaceutical product, product-related variants, and process-related impurities. We also provide insights on the emerging applications of quantitative MS in the lifecycle of biopharmaceutical product development including quality control in the Good Manufacturing Practice (GMP) environment and process analytical technology (PAT) practices during process development and manufacturing. Through collaboration with instrument and software vendors and regulatory agencies, we envision broader adoption of phase-appropriate quantitative MS-based methods for the analysis of biopharmaceutical products, which in turn has the potential to enable manufacture of higher quality products for patients.
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Affiliation(s)
- Xuanwen Li
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, NJ 07065, USA.
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6
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Samadifar M, Yamini Y, Khataei MM, Shirani M. Automated and semi-automated packed sorbent solid phase (micro) extraction methods for extraction of organic and inorganic pollutants. J Chromatogr A 2023; 1706:464227. [PMID: 37506462 DOI: 10.1016/j.chroma.2023.464227] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2023] [Revised: 07/06/2023] [Accepted: 07/19/2023] [Indexed: 07/30/2023]
Abstract
In this study, the packed sorbent solid phase (micro) extraction methods from manual to automated modes are reviewed. The automatic methods have several remarkable advantages such as high sample throughput, reproducibility, sensitivity, and extraction efficiency. These methods include solid-phase extraction, pipette tip micro-solid phase extraction, microextraction by packed sorbent, in-tip solid phase microextraction, in-tube solid phase microextraction, lab-on-a-chip, and lab-on-a-valve. The recent application of these methods for the extraction of organic and inorganic compounds are discussed. Also, the combination of novel technologies (3D printing and robotic platforms) with the (semi)automated methods are investigated as the future trend.
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Affiliation(s)
- Mahsa Samadifar
- Department of Chemistry, Faculty of Sciences, Tarbiat Modares University, Tehran, Iran
| | - Yadollah Yamini
- Department of Chemistry, Faculty of Sciences, Tarbiat Modares University, Tehran, Iran.
| | | | - Mahboue Shirani
- Department of Chemistry, Faculty of Sciences, University of Jiroft, Jiroft, Iran
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7
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Chen Y, Gin JW, Wang Y, de Raad M, Tan S, Hillson NJ, Northen TR, Adams PD, Petzold CJ. Alkaline-SDS cell lysis of microbes with acetone protein precipitation for proteomic sample preparation in 96-well plate format. PLoS One 2023; 18:e0288102. [PMID: 37418444 DOI: 10.1371/journal.pone.0288102] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Accepted: 06/20/2023] [Indexed: 07/09/2023] Open
Abstract
Plate-based proteomic sample preparation offers a solution to the large sample throughput demands in the biotechnology field where hundreds or thousands of engineered microbes are constructed for testing is routine. Meanwhile, sample preparation methods that work efficiently on broader microbial groups are desirable for new applications of proteomics in other fields, such as microbial communities. Here, we detail a step-by-step protocol that consists of cell lysis in an alkaline chemical buffer (NaOH/SDS) followed by protein precipitation with high-ionic strength acetone in 96-well format. The protocol works for a broad range of microbes (e.g., Gram-negative bacteria, Gram-positive bacteria, non-filamentous fungi) and the resulting proteins are ready for tryptic digestion for bottom-up quantitative proteomic analysis without the need for desalting column cleanup. The yield of protein using this protocol increases linearly with respect to the amount of starting biomass from 0.5-2.0 OD*mL of cells. By using a bench-top automated liquid dispenser, a cost-effective and environmentally-friendly option to eliminating pipette tips and reducing reagent waste, the protocol takes approximately 30 minutes to extract protein from 96 samples. Tests on mock mixtures showed expected results that the biomass composition structure is in close agreement with the experimental design. Lastly, we applied the protocol for the composition analysis of a synthetic community of environmental isolates grown on two different media. This protocol has been developed to facilitate rapid, low-variance sample preparation of hundreds of samples and allow flexibility for future protocol development.
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Affiliation(s)
- Yan Chen
- Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, California, United States of America
- DOE Joint BioEnergy Institute, Emeryville, California, United States of America
- DOE Agile BioFoundry, Emeryville, California, United States of America
| | - Jennifer W Gin
- Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, California, United States of America
- DOE Joint BioEnergy Institute, Emeryville, California, United States of America
- DOE Agile BioFoundry, Emeryville, California, United States of America
| | - Ying Wang
- Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, California, United States of America
| | - Markus de Raad
- Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, California, United States of America
| | - Stephen Tan
- Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, California, United States of America
- DOE Joint BioEnergy Institute, Emeryville, California, United States of America
- DOE Agile BioFoundry, Emeryville, California, United States of America
| | - Nathan J Hillson
- Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, California, United States of America
- DOE Joint BioEnergy Institute, Emeryville, California, United States of America
- DOE Agile BioFoundry, Emeryville, California, United States of America
| | - Trent R Northen
- DOE Joint BioEnergy Institute, Emeryville, California, United States of America
- Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, California, United States of America
| | - Paul D Adams
- DOE Joint BioEnergy Institute, Emeryville, California, United States of America
- Department of Bioengineering, University of California Berkeley, Berkeley, California, United States of America
- Molecular Biophysics and Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, California, United States of America
| | - Christopher J Petzold
- Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, California, United States of America
- DOE Joint BioEnergy Institute, Emeryville, California, United States of America
- DOE Agile BioFoundry, Emeryville, California, United States of America
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8
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Révész Á, Hevér H, Steckel A, Schlosser G, Szabó D, Vékey K, Drahos L. Collision energies: Optimization strategies for bottom-up proteomics. MASS SPECTROMETRY REVIEWS 2023; 42:1261-1299. [PMID: 34859467 DOI: 10.1002/mas.21763] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Revised: 11/17/2021] [Accepted: 11/17/2021] [Indexed: 06/07/2023]
Abstract
Mass-spectrometry coupled to liquid chromatography is an indispensable tool in the field of proteomics. In the last decades, more and more complex and diverse biochemical and biomedical questions have arisen. Problems to be solved involve protein identification, quantitative analysis, screening of low abundance modifications, handling matrix effect, and concentrations differing by orders of magnitude. This led the development of more tailored protocols and problem centered proteomics workflows, including advanced choice of experimental parameters. In the most widespread bottom-up approach, the choice of collision energy in tandem mass spectrometric experiments has outstanding role. This review presents the collision energy optimization strategies in the field of proteomics which can help fully exploit the potential of MS based proteomics techniques. A systematic collection of use case studies is then presented to serve as a starting point for related further scientific work. Finally, this article discusses the issue of comparing results from different studies or obtained on different instruments, and it gives some hints on methodology transfer between laboratories based on measurement of reference species.
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Affiliation(s)
- Ágnes Révész
- MS Proteomics Research Group, Institute of Organic Chemistry, Research Centre for Natural Sciences, Budapest, Hungary
| | - Helga Hevér
- Chemical Works of Gedeon Richter Plc, Budapest, Hungary
| | - Arnold Steckel
- Department of Analytical Chemistry, MTA-ELTE Lendület Ion Mobility Mass Spectrometry Research Group, Institute of Chemistry, ELTE Eötvös Loránd University, Budapest, Hungary
| | - Gitta Schlosser
- Department of Analytical Chemistry, MTA-ELTE Lendület Ion Mobility Mass Spectrometry Research Group, Institute of Chemistry, ELTE Eötvös Loránd University, Budapest, Hungary
| | - Dániel Szabó
- MS Proteomics Research Group, Institute of Organic Chemistry, Research Centre for Natural Sciences, Budapest, Hungary
| | - Károly Vékey
- MS Proteomics Research Group, Institute of Organic Chemistry, Research Centre for Natural Sciences, Budapest, Hungary
| | - László Drahos
- MS Proteomics Research Group, Institute of Organic Chemistry, Research Centre for Natural Sciences, Budapest, Hungary
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9
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Waldenmaier HE, Gorre E, Poltash ML, Gunawardena HP, Zhai XA, Li J, Zhai B, Beil EJ, Terzo JC, Lawler R, English AM, Bern M, Mahan AD, Carlson E, Nanda H. "Lab of the Future"─Today: Fully Automated System for High-Throughput Mass Spectrometry Analysis of Biotherapeutics. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2023. [PMID: 37186948 DOI: 10.1021/jasms.3c00036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Here we describe a state-of-the-art, integrated, multi-instrument automated system designed to execute methods involved in mass spectrometry characterization of biotherapeutics. The system includes liquid and microplate handling robotics and utilities, integrated LC-MS, along with data analysis software, to perform sample purification, preparation, and analysis as a seamless integrated unit. The automated process begins with tip-based purification of target proteins from expression cell-line supernatants, which is initiated once the samples are loaded onto the automated system and the metadata are retrieved from our corporate data aggregation system. Subsequently, the purified protein samples are prepared for MS, including deglycosylation and reduction steps for intact and reduced mass analysis, and proteolytic digestions, desalting, and buffer exchange via centrifugation for peptide map analysis. The prepared samples are then loaded into the LC-MS instrumentation for data acquisition. The acquired raw data are initially stored on a local area network storage system that is monitored by watcher scripts that then upload the raw MS data to a network of cloud-based servers. The raw MS data are processed with the appropriately configured analysis workflows such as database search for peptide mapping or charge deconvolution for undigested proteins. The results are verified and formatted for expert curation directly in the cloud. Finally, the curated results are appended to sample metadata in the corporate data aggregation system to accompany the biotherapeutic cell lines in subsequent processes.
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Affiliation(s)
- Hans E Waldenmaier
- Janssen Research & Development, The Janssen Pharmaceutical Companies of Johnson & Johnson, Spring House, Pennsylvania 19477, United States
| | - Elsa Gorre
- Janssen Research & Development, The Janssen Pharmaceutical Companies of Johnson & Johnson, Spring House, Pennsylvania 19477, United States
| | - Michael L Poltash
- Janssen Research & Development, The Janssen Pharmaceutical Companies of Johnson & Johnson, Spring House, Pennsylvania 19477, United States
| | - Harsha P Gunawardena
- Janssen Research & Development, The Janssen Pharmaceutical Companies of Johnson & Johnson, Spring House, Pennsylvania 19477, United States
| | | | - Jing Li
- Protein Metrics LLC., Cupertino, California 95014, United States
| | - Bo Zhai
- Janssen Research & Development, The Janssen Pharmaceutical Companies of Johnson & Johnson, Spring House, Pennsylvania 19477, United States
| | - Eric J Beil
- Janssen Research & Development, The Janssen Pharmaceutical Companies of Johnson & Johnson, Spring House, Pennsylvania 19477, United States
| | - Joseph C Terzo
- Janssen Research & Development, The Janssen Pharmaceutical Companies of Johnson & Johnson, Spring House, Pennsylvania 19477, United States
| | - Rose Lawler
- Protein Metrics LLC., Cupertino, California 95014, United States
| | | | - Marshall Bern
- Protein Metrics LLC., Cupertino, California 95014, United States
| | - Andrew D Mahan
- Janssen Research & Development, The Janssen Pharmaceutical Companies of Johnson & Johnson, Spring House, Pennsylvania 19477, United States
| | - Eric Carlson
- Protein Metrics LLC., Cupertino, California 95014, United States
| | - Hirsh Nanda
- Janssen Research & Development, The Janssen Pharmaceutical Companies of Johnson & Johnson, Spring House, Pennsylvania 19477, United States
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10
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Pohl T, Gervais A, Dirksen E, D'Alessio V, Bechtold-Peters K, Burkitt W, Cao L, Greven S, Lennard A, Li X, Lössner C, Niu B, Reusch D, O'Riordan T, Shearer J, Spencer D, Xu W, Yi L. Technical considerations for the implementation of the Multi-Attribute-Method by mass spectrometry in a Quality Control laboratory. Eur J Pharm Biopharm 2023:S0939-6411(23)00112-1. [PMID: 37146738 DOI: 10.1016/j.ejpb.2023.04.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Revised: 04/27/2023] [Accepted: 04/28/2023] [Indexed: 05/07/2023]
Abstract
Multi-attribute methods employing mass spectrometry are applied throughout the biopharmaceutical industry for product and process characterization purposes but are not yet widely accepted as a method for batch release and stability testing under good manufacturing practice (GMP) due to limited experience and level of comfort with the technical, compliance and regulatory aspects of its implementation at quality control (QC) laboratories. Here, current literature related to the development and application of the multi-attribute method by peptide mapping liquid chromatography mass spectrometry (MAM) is compiled with the aim of providing guidance for the implementation of MAM in a QC laboratory. This article, focusing on technical considerations, is the first part of a two-tiered publication, whereby the second part will focus on GMP compliance and regulatory aspects. This publication has been prepared by a group of industry experts representing 14 globally acting major biotechnology companies under the umbrella of the European Federation of Pharmaceutical Industries and Associations (EFPIA) Manufacturing & Quality Expert Group (MQEG).
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Affiliation(s)
- Thomas Pohl
- Biologics Analytical Development, Novartis Pharma AG, Klybeckstrasse 141, CH-4057 Basel, Switzerland
| | - Annick Gervais
- Analytical Development Sciences for Biologicals, UCB, Chemin du Foriest, 1420 Braine L'Alleud, Belgium
| | - Eef Dirksen
- Analytical Development and Quality Control, Byondis, Microweg 22, 6545 CM, Nijmegen, The Netherlands
| | - Valerio D'Alessio
- Analytical Development Biotech, Merck Serono S.p.A., Via Luigi Einaudi, 11, 00012 Guidonia Montecelio - Rome, Italy
| | - Karoline Bechtold-Peters
- Biologics Drug Product Development, Novartis Pharma AG, Klybeckstrasse 141, CH-4057 Basel, Switzerland
| | - Will Burkitt
- Biological Characterisation Product Development Sciences, UCB, 216 Bath Road, Slough, SL1 3WE, UK
| | - Li Cao
- Strategic External Development, GSK, 1250 S. Collegeville Road, Collegeville, Pennsylvania 19426, USA
| | - Simone Greven
- Pharmaceuticals, Biological Development, Bayer AG, Friedrich-Ebert-Strasse 217-333, 42117 Wuppertal, Germany
| | - Andrew Lennard
- Amgen, 4 Uxbridge Business Park, Sanderson Road, Uxbridge, UB8 1DH, UK
| | - Xue Li
- Biologics Development, Bristol Myers Squibb, 1 Squibb Drive, New Brunswick, New Jersey 08901, USA
| | - Christopher Lössner
- Analytical Dev. Biologicals, Boehringer Ingelheim Pharma GmbH & Co. KG, Birkendorfer Straße 65, 88397 Biberach an der Riß, Germany
| | - Ben Niu
- Biotherapeutics, Bristol Myers Squibb, 4224 Campus Point Court, San Diego, California 92121, USA
| | - Dietmar Reusch
- Pharma Technical Development, Roche Diagnostics GmbH, Nonnenwald 2, 82377 Penzberg, Germany
| | - Tomás O'Riordan
- Eli Lilly Kinsale Limited, Dunderrow, Kinsale, Co. Cork, P17NY71, Ireland
| | - Justin Shearer
- Analytical Development, GSK, 709 Swedeland Road, King of Prussia, Pennsylvania 19406, USA
| | - David Spencer
- BioPharmaceutical Development, Ipsen Biopharm Limited, 9 Ash Road, Wrexham Industrial Estate, Wrexham, LL13 9UF, UK
| | - Wei Xu
- Analytical Sciences, BioPharmaceuticals R&D, AstraZeneca, One Medimmune Way, Gaithersburg, Maryland 20878, USA
| | - Linda Yi
- Analytical Development, Biogen, 5000 Davis Drive, Research Triangle Park, North Carolina 27709, USA
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11
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Bhattacharya S, Joshi S, Rathore AS. A native multi-dimensional monitoring workflow for at-line characterization of mAb titer, size, charge, and glycoform heterogeneities in cell culture supernatant. J Chromatogr A 2023; 1696:463983. [PMID: 37054641 DOI: 10.1016/j.chroma.2023.463983] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Revised: 03/26/2023] [Accepted: 04/07/2023] [Indexed: 04/15/2023]
Abstract
With growing maturity of the biopharmaceutical industry, new modalities entering the therapeutic design space and increasing complexity of formulations such as combination therapy, the demands and requirements on analytical workflows have also increased. A recent evolution in newer analytical workflows is that of multi-attribute monitoring workflows designed on chromatography-mass spectrometry (LC-MS) platform. In comparison to traditional one attribute per workflow paradigm, multi-attribute workflows are designed to monitor multiple critical quality attributes through a single workflow, thus reducing the overall time to information and increasing efficiency and throughput. While the 1st generation multi-attribute workflows focused on bottom-up characterization following peptide digestion, the more recent workflows have been focussing on characterization of intact biologics, preferably in native state. So far intact multi-attribute monitoring workflows suitable for comparability, utilizing single dimension chromatography coupled with MS have been published. In this study, we describe a native multi-dimensional multi-attribute monitoring workflow for at-line characterization of monoclonal antibody (mAb) titer, size, charge, and glycoform heterogeneities directly in cell culture supernatant. This has been achieved through coupling ProA in series with size exclusion chromatography in 1st dimension followed by cation exchange chromatography in the 2nd dimension. Intact paired glycoform characterization has been achieved through coupling 2D-LC with q-ToF-MS. The workflow with a single heart cut can be completed in 25 mins and utilizes 2D-liquid chromatography (2D-LC) to maximize separation and monitoring of titer, size as well as charge variants.
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Affiliation(s)
- Sanghati Bhattacharya
- Department of Chemical Engineering, Indian Institute of Technology, Hauz Khas, New Delhi, 110016, India
| | - Srishti Joshi
- Department of Chemical Engineering, Indian Institute of Technology, Hauz Khas, New Delhi, 110016, India
| | - Anurag S Rathore
- Department of Chemical Engineering, Indian Institute of Technology, Hauz Khas, New Delhi, 110016, India.
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12
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Sadek M, Moore BN, Yu C, Ruppe N, Abdun-Nabi A, Hao Z, Alvarez M, Dahotre S, Deperalta G. A Robust Purity Method for Biotherapeutics Using New Peak Detection in an LC-MS-Based Multi-Attribute Method. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2023; 34:484-492. [PMID: 36802331 DOI: 10.1021/jasms.2c00355] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
New peak detection (NPD), as part of the LC-MS-based multi-attribute method (MAM), allows for sensitive and unbiased detection of new or changing site-specific attributes between a sample and reference that is not possible with conventional UV or fluorescence detection-based methods. MAM with NPD can serve as a purity test that can establish whether a sample and the reference are similar. The broad implementation of NPD in the biopharmaceutical industry has been limited by the potential presence of false positives or artifacts, which increase the analysis time and can trigger unnecessary investigations of product quality. Our novel contributions to the success of NPD are the curation of false positives, use of the known peak list concept, pairwise analysis approach, and the development of a NPD system suitability control strategy. In this report, we also introduce a unique experimental design utilizing sequence variant co-mixes to measure NPD performance. We show that NPD has superior performance relative to conventional control system methods in the detection of an unexpected change as compared with the reference. NPD is a new frontier in purity testing that reduces subjectivity, need for analyst intervention, and potential for missing unexpected product quality changes.
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Affiliation(s)
- Monica Sadek
- Protein Analytical Chemistry, Genentech, 1 DNA Way, South San Francisco, California 94080, United States
| | - Benjamin Nathan Moore
- Protein Analytical Chemistry, Genentech, 1 DNA Way, South San Francisco, California 94080, United States
| | - Christopher Yu
- Protein Analytical Chemistry, Genentech, 1 DNA Way, South San Francisco, California 94080, United States
| | - Nicholas Ruppe
- Protein Analytical Chemistry, Genentech, 1 DNA Way, South San Francisco, California 94080, United States
| | - Austin Abdun-Nabi
- Protein Analytical Chemistry, Genentech, 1 DNA Way, South San Francisco, California 94080, United States
| | - Zhiqi Hao
- Protein Analytical Chemistry, Genentech, 1 DNA Way, South San Francisco, California 94080, United States
| | - Melissa Alvarez
- Protein Analytical Chemistry, Genentech, 1 DNA Way, South San Francisco, California 94080, United States
| | - Sanket Dahotre
- Protein Analytical Chemistry, Genentech, 1 DNA Way, South San Francisco, California 94080, United States
| | - Galahad Deperalta
- Protein Analytical Chemistry, Genentech, 1 DNA Way, South San Francisco, California 94080, United States
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13
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Li X, Pierson NA, Hua X, Patel BA, Olma MH, Strulson CA, Letarte S, Richardson DD. Analytical Performance Evaluation of Identity, Quality-Attribute Monitoring and new Peak Detection in a Platform Multi-Attribute Method Using Lys-C Digestion for Characterization and Quality Control of Therapeutic Monoclonal Antibodies. J Pharm Sci 2023; 112:691-699. [PMID: 36279953 DOI: 10.1016/j.xphs.2022.10.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 10/15/2022] [Accepted: 10/15/2022] [Indexed: 11/06/2022]
Abstract
The use of multi-attribute method (MAM) for identity and purity testing of biopharmaceuticals offers the ability to complement and replace multiple conventional analytical technologies with a single mass spectrometry (MS) method. Phase-appropriate method validation is one major consideration for the implementation of MAM in a current Good Manufacturing Practice (cGMP) environment. We developed a MAM workflow for therapeutic monoclonal antibodies (mAbs) with optimized sample preparation using lysyl endopeptidase (Lys-C) digestion. In this study, we evaluated the assay performances of this platform MAM workflow for identity, product quality attributes (PQAs) monitoring and new peak detection (NPD) for single and coformulated mAbs. An IgG4 mAb-1 and its coformulations were used as model molecules in this study. The assay performance evaluation demonstrated the full potential of the platform MAM approach for its intended use for characterization and quality control of single mAb-1 and mAb-1 in its coformulations. To the best of our knowledge, this is the first performance evaluation of MAM for mAb identity, PQA monitoring, and new peak detection (NPD) in a single assay, featuring 1) the first performance evaluation of MAM for PQA monitoring using Lys-C digestion with a high-resolution MS, 2) a new approach for mAb identity testing capable of distinguishing single mAb from coformulations using MAM, and 3) the performance evaluation of NPD for MAM with Lys-C digestion. The developed platform MAM workflow and the MAM performance evaluation paved the way for its GMP qualification and enabled clinical release of mAb-1 in GMP environment with MAM.
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Affiliation(s)
- Xuanwen Li
- Analytical Research & Development, Merck & Co., Inc., 2000 Galloping Hill Road, Kenilworth, NJ 07033, United States.
| | - Nicholas A Pierson
- Analytical Research & Development, Merck & Co., Inc., 2000 Galloping Hill Road, Kenilworth, NJ 07033, United States
| | - Xiaoqing Hua
- Analytical Research & Development, Merck & Co., Inc., 2000 Galloping Hill Road, Kenilworth, NJ 07033, United States
| | - Bhumit A Patel
- Analytical Research & Development, Merck & Co., Inc., 2000 Galloping Hill Road, Kenilworth, NJ 07033, United States
| | - Michael H Olma
- Analytical Research & Development, Merck & Co., Inc., 2000 Galloping Hill Road, Kenilworth, NJ 07033, United States
| | - Christopher A Strulson
- Analytical Research & Development, Merck & Co., Inc., 2000 Galloping Hill Road, Kenilworth, NJ 07033, United States
| | - Simon Letarte
- Analytical Research & Development, Merck & Co., Inc., 2000 Galloping Hill Road, Kenilworth, NJ 07033, United States
| | - Douglas D Richardson
- Analytical Research & Development, Merck & Co., Inc., 2000 Galloping Hill Road, Kenilworth, NJ 07033, United States
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14
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Comprehensive multi-attribute method workflow for biotherapeutic characterization and current good manufacturing practices testing. Nat Protoc 2022; 18:1056-1089. [PMID: 36526726 DOI: 10.1038/s41596-022-00785-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Accepted: 10/04/2022] [Indexed: 12/23/2022]
Abstract
The multi-attribute method (MAM) is a liquid chromatography-mass spectrometry (LC-MS)-based method that is used to directly characterize and monitor numerous product quality attributes (PQAs) at the amino acid level of a biopharmaceutical product. MAM enables identity testing based on primary sequence verification, detection and quantitation of post-translational modifications and impurities. This ability to simultaneously and directly determine PQAs of therapeutic proteins makes MAM a more informative, streamlined and productive workflow than conventional chromatographic and electrophoretic assays. MAM relies on proteolytic digestion of the sample followed by reversed-phase chromatographic separation and high-resolution LC-MS analysis in two phases. First, a discovery study to determine quality attributes for monitoring is followed by the creation of a targeted library based on high-resolution retention time plus accurate mass analysis. The second aspect of MAM is the monitoring phase based on the target peptide library and new peak detection using differential analysis of the data to determine the presence, absence or change of any species that might affect the activity or stability of the biotherapeutic. The sample preparation process takes between 90 and 120 min, whereas the time spent on instrumental and data analyses might vary from one to several days for different sample sizes, depending on the complexity of the molecule, the number of attributes to be monitored and the information to be detailed in the final report. MAM is developed to be used throughout the product life cycle, from process development through upstream and downstream processes to quality control release or under current good manufacturing practices regulations enforced by regulatory agencies.
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15
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Kristensen DB, Ørgaard M, Sloth TM, Christoffersen NS, Leth-Espensen KZ, Jensen PF. Optimized Multi-Attribute Method Workflow Addressing Missed Cleavages and Chromatographic Tailing/Carry-Over of Hydrophobic Peptides. Anal Chem 2022; 94:17195-17204. [PMID: 36346901 DOI: 10.1021/acs.analchem.2c03820] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Peptide mapping by liquid chromatography mass spectrometry (LC-MS) and the related multi-attribute method (MAM) are well-established analytical tools for verification of the primary structure and mapping/quantitation of co- and post-translational modifications (PTMs) or product quality attributes in biopharmaceutical development. Proteolytic digestion is a key step in peptide mapping workflows, which traditionally is labor-intensive, involving multiple manual steps. Recently, simple high-temperature workflows with automatic digestion were introduced, which facilitate robustness and reproducibility across laboratories. Here, a modified workflow with an automatic digestion step is presented, which includes a two-step digestion at high and low temperatures, as opposed to the original one-step digestion at a high temperature. The new automatic digestion workflow significantly reduces the number of missed cleavages, obtaining a more complete digestion profile. In addition, we describe how chromatographic peak tailing and carry-over is dramatically reduced for hydrophobic peptides by switching from the traditional C18 reversed-phase (RP) column chemistry used for peptide mapping to a less retentive C4 column chemistry. No negative impact is observed on MS/MS-derived sequence coverage when switching to a C4 column chemistry. Overall, the new peptide mapping workflow significantly reduces the number of missed cleavages, yielding more robust and simple data interpretation, while providing dramatically reduced tailing and carry-over of hydrophobic peptides.
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16
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Torres-Acosta MA, Lye GJ, Dikicioglu D. Automated liquid-handling operations for robust, resilient, and efficient bio-based laboratory practices. Biochem Eng J 2022. [DOI: 10.1016/j.bej.2022.108713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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17
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Cook K, Kristensen DB, Ørgaard M, Sloth TM. Overcoming Incomplete Peptide Mapping of Antibody Complementarity-Determining Regions with Alternate Digestion Workflows. LCGC NORTH AMERICA 2022. [DOI: 10.56530/lcgc.na.pn1583m3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Peptide mapping of antibodies is an essential method to monitor peptide modifications in antibody lots that could affect the safety and efficacy of the product. Conventional protocols rely on protein digestion using proteases, such as trypsin, before mapping with mass spectrometry (MS). However, trypsin digestion may cause incomplete mapping of peptides, especially those that include highly hydrophobic peptides. Here, we show how pepsin can be used as an alternative and complementary protease for digestion that allows for improved sequence coverage, especially in proteins with highly hydrophobic regions. We also show that using guanidine hydrochloride (GuHCl) post-digestion improves peptide mapping results. Overall, these two methods—pepsin digestion and GuHCl post-digestion—can be used to provide more comprehensive antibody peptide maps, thereby enabling more thorough quality checking of biopharmaceutical products.
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18
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Li X, Rawal B, Rivera S, Letarte S, Richardson DD. Improvements on sample preparation and peptide separation for reduced peptide mapping based multi-attribute method analysis of therapeutic monoclonal antibodies using lysyl endopeptidase digestion. J Chromatogr A 2022; 1675:463161. [DOI: 10.1016/j.chroma.2022.463161] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Revised: 05/17/2022] [Accepted: 05/18/2022] [Indexed: 12/14/2022]
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19
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Niu B, Martinelli M, de Mel N, Meinke E, Zhai W, Kilby G, Xu W, Chen X, Wang C. Eliminating protein oxidation artifacts during High Performance Liquid Chromatography peak fractionation processes. J Chromatogr A 2021; 1663:462761. [PMID: 34968959 DOI: 10.1016/j.chroma.2021.462761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Revised: 12/14/2021] [Accepted: 12/16/2021] [Indexed: 11/28/2022]
Abstract
Therapeutic monoclonal antibodies (mAbs) are inherently heterogeneous and hence generally studied and controlled by an array of orthogonal separation methods. During drug candidate development, fractionation by HPLC is regularly employed to assist peak identification and product understanding. One overlooked challenge is the protein oxidation introduced by the fractionation process. In this study, we report the extent of fractionation-induced protein oxidation, which tends to complicate data interpretation and peak assignments. Higher-energy detectors such as fluorescence detectors and lower fraction concentration were found to exacerbate the oxidation artifacts. Other contributing factors than the detector-induced photostress were also found to contribute significantly to protein oxidation. Furthermore, our study showed that collecting fractions into a solution with oxidation scavengers, such as histidine and methionine, was effective in eliminating the oxidation artifacts introduced by detector exposure and fraction processing steps. Through an example, we demonstrate that the modified fractionation workflow improves the accuracy of peak assignments.
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Affiliation(s)
- Ben Niu
- Analytical Sciences, BioPharmaceuticals Development, R&D, AstraZeneca, Gaithersburg, USA
| | - Michael Martinelli
- Analytical Sciences, BioPharmaceuticals Development, R&D, AstraZeneca, Gaithersburg, USA
| | - Niluka de Mel
- Analytical Sciences, BioPharmaceuticals Development, R&D, AstraZeneca, Gaithersburg, USA
| | - Eric Meinke
- Analytical Sciences, BioPharmaceuticals Development, R&D, AstraZeneca, Gaithersburg, USA
| | - Weiguo Zhai
- Analytical Sciences, BioPharmaceuticals Development, R&D, AstraZeneca, Gaithersburg, USA
| | - Greg Kilby
- Analytical Sciences, BioPharmaceuticals Development, R&D, AstraZeneca, Gaithersburg, USA
| | - Wei Xu
- Analytical Sciences, BioPharmaceuticals Development, R&D, AstraZeneca, Gaithersburg, USA
| | - Xiaoyu Chen
- Analytical Sciences, BioPharmaceuticals Development, R&D, AstraZeneca, Gaithersburg, USA
| | - Chunlei Wang
- Analytical Sciences, BioPharmaceuticals Development, R&D, AstraZeneca, Gaithersburg, USA.
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20
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Sitasuwan P, Powers TW, Medwid T, Huang Y, Bare B, Lee LA. Enhancing the multi-attribute method through an automated and high-throughput sample preparation. MAbs 2021; 13:1978131. [PMID: 34586946 PMCID: PMC8489909 DOI: 10.1080/19420862.2021.1978131] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
The multi-attribute method (MAM), a recent advance in the application of liquid chromatography-mass spectrometry within the pharmaceutical industry, enables the simultaneous monitoring of multiple product quality attributes in a single analytical method. While MAM is coupled with automated data processing and reporting, the sample preparation, based on proteolytic peptide mapping, remains cumbersome and low throughput. The standard sample preparation for MAM relies on protein denaturation, reduction, and alkylation prior to proteolytic digestion, but often a desalting step is required to maintain enzymatic activity. While most of the sample preparation can be automated on a standard robotic liquid handling system, a streamlined approach for protein desalting and temperature modulation is required for a viable, fully automated digestion. In this work, for the first time, a complete tip-based MAM sample preparation is automated on a single robotic liquid handling system, leveraging a deck layout that integrates both heating and cooling functionalities. The fully automated method documented herein achieves a high-throughput sample preparation for MAM, while maintaining superior method performance. Abbreviations: MAM: multi-attribute method; PQAs: product quality attributes; CE: capillary electrophoresis; IEX: ion-exchange chromatography; HILIC-FLR: hydrophilic interaction liquid chromatography coupled to a fluorescence detector; RP-LC/UV: reversed-phase liquid chromatography coupled to a UV detector; MS: mass spectrometry; NPD: new peak detection; GdnHCl: guanidine hydrochloride; TIC: total ion current; pAb: polyclonal antibody; IgG: immunoglobulin G; DTT: dithiothreitol; IAA: iodoacetic acid; TFA: trifluoroacetic acid; A280: absorbance at 280 nm wavelength; 96MPH: 96-channel multi-probe head; CPAC: Cold Plate Air Cooled; HHS: Hamilton Heater Shaker; DWP: Deep-Well Plate; PCR: Polymerase Chain Reaction; NTR: Nested Tip Rack; Met: methionine; Trp: tryptophan; N-term pQ: N-terminal glutamine cyclization; Lys: lysine; PAM: peptidylglycine α-amidating monooxygenase; G0F: asialo-, agalacto-, bi-antennary, core substituted with fucose; G1F: asialo-, mono-galactosylated bi-antennary, core substituted with fucose; G2F: asialo-, bi-galactosylated bi-antennary, core substituted with fucose; G0: asialo-, agalacto-, bi-antennary; Man5: oligomannose 5; Man8: oligomannose 8; TriF: asialo-, tri-galactosylated tri-antennary, core substituted with fucose.
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Affiliation(s)
| | | | | | | | | | - L Andrew Lee
- Integrated Micro-Chromatography Systems, Inc, Irmo, SC, USA
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