Macroporous Affinity Membranes for High-Capacity, Rapid Biologics Purification
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Solution Overview
Problem
Existing resin-based chromatography methods for biologics purification face challenges with low binding capacity at short residence times, leading to low productivity and potential product degradation, especially for larger biologics, and there is a lack of affinity membrane chromatography products suitable for high-throughput purification.
Innovation Solution
A method for preparing a membrane with a macroporous structure, using swelling solvents and coupling reagents to immobilize ligands like Protein A, achieving high binding capacity and short residence times, with a specific surface area of 0.1-20 m²/mL and dynamic binding capacity of 20-90 mg/mL at 6 seconds with <3 bar backpressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If resin-based chromatography is used to achieve high binding capacity, then binding capacity is improved, but residence time increases significantly (6 min or longer)
Solution Approach 1:
The patent uses macroporous hydrogel beads with large pore diameters (1-10 μm) that enable rapid mass transfer of biologics while maintaining high binding capacity. The macroporous structure allows proteins to access binding sites quickly, achieving high binding capacity at short residence times (6 seconds or less), resolving the contradiction between binding capacity and residence time that plagues conventional resin chromatography.
Solution Approach 2:
The patent changes the physical parameters of the chromatography medium by using hydrogel beads with specific mesh sizes (20-200 μm) and pore diameters (1-10 μm), along with controlling crosslinking degrees (5-50%). These parameter changes enable the medium to achieve both high binding capacity and short residence time, overcoming the limitations of conventional resins that require long residence times.
2Quantity of substance
If conventional resin chromatography is used, then binding capacity is achieved, but productivity decreases due to long residence times
Solution Approach 1:
The macroporous hydrogel structure with large pores enables rapid protein diffusion and mass transfer, allowing the system to achieve high binding capacity while maintaining short residence times. This directly improves productivity by enabling faster processing speeds without sacrificing binding capacity, addressing the productivity limitation of conventional resin chromatography.
3Quantity of substance
If porous hydrogel membranes with high surface area are used, then static binding capacity is improved, but macromolecule accessibility decreases due to small mesh size
Solution Approach 1:
The patent optimizes the pore structure by creating macropores (1-10 μm) that are large enough to accommodate macromolecules like proteins and antibodies, while maintaining high surface area through controlled mesh sizes (20-200 μm). This dual optimization ensures both high static binding capacity and excellent macromolecule accessibility, resolving the contradiction between these two parameters.
Solution Approach 2:
The patent creates different structural characteristics at different scales: macroscopic mesh sizes (20-200 μm) for overall structure and macropore diameters (1-10 μm) for molecular accessibility. This hierarchical local quality optimization allows the material to simultaneously achieve high binding capacity through large surface area and good macromolecule accessibility through large pores.
4Quantity of substance
If affinity chromatography is used for high binding capacity, then binding capacity is improved, but flow rate must be reduced (long residence time) to maintain capacity
Solution Approach 1:
The macroporous hydrogel structure enables rapid mass transfer that decouples the relationship between binding capacity and flow rate. The large pores allow proteins to diffuse quickly to binding sites even at high flow rates, maintaining high binding capacity while enabling fast flow rates and short residence times (6 seconds or less), thus resolving the contradiction between binding capacity and flow rate.
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 membrane achieves high static and dynamic binding capacities for biologics such as antibodies, plasmid DNA, and viral vectors, significantly increasing productivity by 45 times compared to leading resin columns, while maintaining low backpressure.
Implementation Method 1
immersing a membrane into a first solution of a coupling reagent in a first swelling solvent solution to swell said membrane and increase exposure of reactive sites on said membrane
Implementation Method 2
attachment of said coupling reagent to form coupling groups
Implementation Method 3
immersing said membrane into a second solution comprising adsorptive groups in a second swelling solvent solution to react at least a portion of said coupling groups with adsorptive groups that provide a concentration effect for coupling at least one selected from the group consisting of ligands
Data Source
AI summary
A method for preparing an adsorptive media for binding biologic molecules comprising immersing a macroporous support in a first solution of a coupling reagent in a solvent solution for attachment of said coupling reagent to form coupling groups; and, immersing said macroporous support in an incubating solution selected from the group consisting of ligand, nucleotide, oligonucleotide, peptide, polypeptide, protein, and enzyme solutions having an affinity to a biologic target molecule to couple one of said ligands, nucleotides, oligonucleotides, peptides, polypeptides, proteins, and enzymes to at least a portion of said coupling groups of said macroporous support for binding with said biologic target molecule when exposed to said macroporous support.