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Comparison of protein A affinity sorbents
Rainer Hahn1, Robert Schlegel, Alois Jungbauer
1Institute for Applied Microbiology, University of Agricultural Sciences, Muthgasse 18, A-1190, Vienna, Austria.
Summary
This study evaluated 15 Protein A media for antibody purification, finding that agarose-based media offer higher capacity at longer residence times. Other media show less dependence on flow rate, crucial for optimizing large-scale bioprocessing.
Area of Science:
- Biotechnology
- Protein Purification
- Chromatography
Background:
- Protein A is a key ligand for purifying monoclonal and recombinant antibodies.
- Evaluating commercial Protein A media is essential for efficient antibody production.
Purpose of the Study:
- To assess the performance of 15 commercial Protein A media for antibody purification.
- To determine equilibrium and dynamic binding capacities and IgG capture efficiency from crude feedstock.
Main Methods:
- Dynamic binding capacity was screened at small scale and further tested with increased column height.
- Adsorption isotherms were determined, and breakthrough profiles were fitted using the Thomas solution.
- Selectivity was evaluated using polyclonal human IgG in cell culture supernatant.
Main Results:
- Dynamic binding capacity significantly depends on residence time; agarose-based media excel at longer residence times (>3 min).
- Polymeric and porous glass media showed less dependence on flow velocity, indicating faster mass transfer.
- Agarose media had higher equilibrium binding capacities and smaller dissociation constants, while other media had higher apparent rate constants.
Conclusions:
- Media selection for Protein A chromatography should consider residence time and flow velocity for optimal performance.
- Understanding binding kinetics and capacity is crucial for scaling up antibody purification processes.
- This comparative study provides guidance for selecting Protein A media in large-scale antibody purification.