Flow-Through Anion Exchange for Antibody Impurity Removal
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Solution Overview
Problem
Conventional purification methods struggle to effectively remove product-related impurities such as acidic variants and high molecular weight species from monoclonal antibodies, which are critical for maintaining product efficacy and safety, while also being cost-effective and efficient.
Innovation Solution
Utilizing anion exchange chromatography, specifically strong anion exchange chromatography, in a flow-through mode with a pH range of 7.0 to 7.5, to separate and purify antibodies or fusion proteins, allowing product-related impurities to bind to the resin while the desired protein flows through, thereby reducing acidic variants and HMW impurities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional cation exchange or multimodal chromatography is used to remove product-related impurities, then purification effectiveness is improved, but process complexity and cost increase
Solution Approach 1:
The patent changes the fundamental parameter of charge interaction by using anion exchange (negative charge attraction) instead of cation exchange (positive charge attraction). This parameter reversal enables the antibody to flow through while acidic variants bind to the column, achieving purification with a simpler single-column process rather than complex multi-column sequences
Solution Approach 2:
The patent inverts the conventional approach by allowing the product (antibody) to flow through the column while impurities (acidic variants) bind. This inversion of the traditional bind-product-release-impurities paradigm simplifies the process by eliminating the need for product binding and subsequent elution steps required in cation exchange methods
2Manufacturing precision
If multiple chromatography columns are used to separate acidic variants, then purification precision is improved, but productivity decreases due to additional steps
Solution Approach 1:
The patent merges multiple purification functions into a single anion exchange chromatography step. By combining acidic variant removal with the main purification process in one column operation, it eliminates the need for separate cation exchange or additional polishing columns, thereby maintaining high purification precision while significantly improving productivity
Solution Approach 2:
The anion exchange column serves multiple functions simultaneously: it removes acidic variants, eliminates aggregates through the flow-through mode, and performs the primary purification step. This multi-functionality in a single unit operation achieves both high precision and high productivity by reducing the total number of process steps
3Loss of time
If flow-through mode is used in anion exchange chromatography, then process time is reduced, but separation precision may be compromised
Solution Approach 1:
The patent optimizes the pH parameter to be below the isoelectric point of the antibody but above that of acidic variants. This precise parameter control ensures that at the operating pH, acidic variants remain negatively charged and bind to the anion exchange column, while the antibody has reduced negative charge and flows through, achieving both rapid separation and high precision in a single pass
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
The process achieves a substantial reduction of acidic variants to less than 15% and HMW to less than 0.5%, meeting regulatory standards and reducing the need for additional purification steps, thus enhancing product quality and efficiency.
Implementation Method 1
anion exchange chromatography wherein the purified antibody or fragment is obtained in flow-through and substantially free of at least one of the product-related impurities
Implementation Method 2
product-related impurities binds to the anion exchange resin
Data Source
AI summary
A process for purification of antibody or fusion protein through anion exchange chromatography to produce an antibody or fusion protein which is substantially free of at least one of the product-related impurities.