Porous Shell Chromatography Beads for Plasma Protein Purification
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Solution Overview
Problem
Current methods for purifying plasma proteins, such as Factor VIII and Factor IX, are inadequate as they often result in loss of protein activity and contamination issues, leading to unsatisfactory yields and potential adverse reactions.
Innovation Solution
A chromatographic method using a resin with a porous shell and core, where the inner core contains anion exchange ligands and the shell is inactive, allowing for size-dependent separation of large and small proteins, enabling effective purification of therapeutic proteins like Factor VIII, von Willebrand factor, IgG, and Factor IX while minimizing contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional chromatography methods are used for plasma protein purification, then purification is achieved, but protein activity is lost and contamination occurs
Solution Approach 1:
The chromatography bead is divided into two distinct porous regions: an inner porous core containing anion exchange ligands for selective binding, and an outer porous shell providing size-based filtration. This segmentation allows large proteins to be excluded from the core while small proteins are retained, solving the contradiction between maintaining protein activity and achieving effective purification.
Solution Approach 2:
Different regions of the chromatography bead are assigned different functional properties: the inner core has anion exchange ligands for electrostatic binding of small proteins, while the outer shell is porous for size exclusion. This local differentiation enables simultaneous size-based and charge-based separation mechanisms, improving both purification efficiency and protein activity retention.
2Manufacturing precision
If size-based filtration is used to separate large proteins, then large proteins are excluded, but small proteins cannot be effectively purified
Solution Approach 1:
The bead structure is segmented into an inner core for small protein binding and an outer shell for size exclusion. This allows the system to perform both size-based filtration and charge-based binding in a single step, resolving the contradiction between excluding large proteins and purifying small proteins.
Solution Approach 2:
The porous shell acts as an intermediary structure that allows size-based pre-filtration while permitting small proteins to reach the anion exchange ligands in the core. This intermediary layer enables sequential separation mechanisms without requiring multiple processing steps.
3Reliability
If anion exchange ligands are present throughout the bead, then small proteins bind, but large proteins can enter and cause contamination
Solution Approach 1:
The anion exchange ligands are confined to the inner core, which is inaccessible to large proteins due to the size-excluding outer shell. This spatial segmentation prevents large protein contamination while maintaining small protein binding capability.
Solution Approach 2:
The anion exchange functionality is localized to the inner core region, while the outer shell provides size-based exclusion. This local quality differentiation ensures that only small proteins can reach and bind to the ligands, eliminating the harmful effect of large protein contamination.
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 method achieves high yields and maintains protein activity by separating large proteins in the flow-through and smaller proteins through elution, reducing contamination and improving therapeutic protein purification efficiency.
Implementation Method 1
the inner core is provided with anion exchange ligands and the shell is inactive (ie not provided with any ligands)
Implementation Method 2
adsorbing Factor IX (FIX) on the anion exchange ligands in the core
Implementation Method 3
the porosity of the lid and core does not allow entering of molecules larger than 500 kD, such as FIII/vWF
Data Source
AI summary
The present invention relates to the field of chromatography. More closely, the invention relates to a chromatographic method for purification of proteins, such as Factor VIII, von Willebrand factor and Factor IX. The chromatographic method is performed on a matrix comprising an inner porous core and outer porous lid surrounding said core.