Antibody Purification via Mixed-Mode Chromatography
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Solution Overview
Problem
Current methods for purifying antibodies, especially bispecific monoclonal antibodies and intact antibodies, face challenges in efficiently separating these molecules from mixtures containing antibody fragments and free light chains, which complicates therapeutic applications and manufacturing processes.
Innovation Solution
The use of antibody-specific affinity media, such as KappaSelect and LambdaFabSelect resins, along with mixed mode chromatography agents like Mep HyperCel, to selectively bind and elute bispecific antibodies and intact antibodies, allowing for differential separation based on light chain specificity and pH variations, salt concentrations, and denaturing agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional purification methods are used for intact antibodies, then the purification process becomes complex and time-consuming, but the separation efficiency from free light chains and antibody fragments remains insufficient
Solution Approach 1:
The patent employs Mep HyperCel mixed-mode chromatography media as an intermediary substance that provides both cation exchange and hydrophobic interaction capabilities in a single column. This media acts as a mediator that simultaneously captures intact antibodies through multiple mechanisms while allowing free light chains and fragments to pass through, thereby simplifying the purification process into a single step while maintaining high separation efficiency
Solution Approach 2:
The patent merges cation exchange chromatography and hydrophobic interaction chromatography into a single mixed-mode chromatography step using Mep HyperCel media. This combination of two separate purification techniques into one unified process reduces the number of steps required, decreases processing time, and simplifies the overall purification workflow while achieving effective separation of intact antibodies from contaminants
2Manufacturing precision
If multiple purification steps are implemented to separate intact antibodies from free light chains, then the separation precision improves, but the manufacturing cost and process time increase
Solution Approach 1:
The patent segments the chromatography media into distinct functional regions within the Mep HyperCel particles, providing both cation exchange sites and hydrophobic interaction sites simultaneously. This segmentation of functional capabilities within a single media type allows intact antibodies to be captured through multiple mechanisms in one pass, achieving high separation precision without requiring multiple sequential purification steps
Solution Approach 2:
The patent performs preliminary capture of intact antibodies on the Mep HyperCel mixed-mode media under optimized binding conditions before any separation occurs. By pre-establishing the capture of target antibodies through dual mechanisms (cation exchange and hydrophobic interaction) in a single step, the method eliminates the need for subsequent separation steps, thereby reducing process time while maintaining high separation precision
3Ease of operation
If standard affinity chromatography is used for antibody purification, then the process is simple and fast, but it cannot effectively separate intact antibodies from free light chains
Solution Approach 1:
The patent uses Mep HyperCel mixed-mode chromatography media as a composite material that integrates cation exchange functionality and hydrophobic interaction functionality within the same stationary phase. This composite approach allows the simple, fast operation of affinity chromatography to be maintained while achieving the enhanced separation precision needed to distinguish intact antibodies from free light chains and fragments through multiple simultaneous interaction mechanisms
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables rapid and efficient purification of bispecific antibodies and intact antibodies, maintaining their unmodified nature and favorable manufacturing characteristics, while effectively removing free light chains, thus simplifying the purification process and reducing costs.
Implementation Method 1
antibody-specific affinity media... that are specific for kappa (κ) light chains and portions thereof, such as KappaSelect resin and/or a Protein L-containing resin
Implementation Method 2
The purification medium is, in some embodiments, a mixed mode chromatography agent such as Mep HyperCelTM chromatography sorbent, which isolates intact IgG antibodies from antibody fragments and other antibody components
Implementation Method 3
The eluting agent is different from the binding agent, and the binding and elution conditions include a step variation in the pH level
Implementation Method 4
The binding and/or elution conditions include one or more mild denaturing agents
Data Source
Figure 1A~1C
Figure 2
Figure 3A
AI summary
The invention provides methods of purifying antibodies using various antibody- specific purification media to rapidly and efficiently separate mixtures of antibodies, antibody fragments and/or antibody components to isolate a desired antibody product from the mixture. The invention relates to the purification of bispecific monoclonal antibodies carrying a different specificity for each binding site of the immunoglobulin molecule, e.g., antibodies composed of a single heavy chain and two different light chains, one containing Kappa constant domain and the other a Lambda constant domain, including antibodies of different specificities that share a common heavy chain. The invention also provides the methods of efficiently purifying intact antibodies by separating the intact antibody from non-intact antibodies including free light chains.