Immunoglobulin Purification via Cation Exchange Flow-Through
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Solution Overview
Problem
Current methods for purifying immunoglobulins often fail to effectively separate monomeric forms from aggregated forms, leading to impurities and reduced purity in biopharmaceuticals, which is crucial for ensuring safety and regulatory compliance.
Innovation Solution
A method involving the use of membrane cation exchange materials in flow-through mode, where an aqueous, buffered solution with specific pH and conductivity conditions allows at least 90% of immunoglobulin in monomeric form to not bind, thereby separating it from aggregated forms, and further steps involving anion exchange or affinity chromatography can be employed for additional purification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional purification methods (affinity chromatography, ion exchange, size exclusion) are used, then immunoglobulins can be purified from cell culture supernatants, but monomeric immunoglobulins cannot be effectively separated from aggregated forms, leading to reduced purity
Solution Approach 1:
The invention applies parameter changes by utilizing specific pH and conductivity conditions in the buffered solution to enable selective flow-through of monomeric immunoglobulins while retaining aggregated forms on the cation exchange membrane. The buffered solution has a pH of 5.0-8.0 and conductivity of 2-15 mS/cm, with the sum of pH and conductivity (pH + conductivity/10) between 10-18, creating optimal conditions for monomer separation without binding to the membrane.
Solution Approach 2:
The invention extracts monomeric immunoglobulins from the mixture by allowing them to pass through the cation exchange membrane in flow-through mode, while aggregated forms are retained on the membrane. This selective extraction achieves separation based on the different binding properties of monomers and aggregates under the specified buffered conditions.
2Manufacturing precision
If multiple chromatographic steps are used to improve purity, then impurities can be removed, but process complexity and time increase
Solution Approach 1:
The invention merges the functions of multiple chromatographic steps into a single cation exchange membrane step operating in flow-through mode. This single step simultaneously achieves removal of aggregated immunoglobulins and other impurities, replacing what would traditionally require multiple sequential chromatography steps, thereby reducing device complexity and process time while maintaining high purity.
3Manufacturing precision
If ion exchange chromatography is used to bind immunoglobulins, then purification can be achieved, but monomeric immunoglobulins bind to the membrane reducing yield
Solution Approach 1:
The invention inverts the conventional ion exchange chromatography approach by operating in flow-through mode instead of bind-and-elute mode. Rather than binding monomeric immunoglobulins to the membrane and eluting them later, the method allows monomers to pass through unbound while retaining aggregates on the membrane, thereby preventing loss of monomeric immunoglobulin and maximizing yield while still achieving purification.
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 enables the rapid and efficient purification of immunoglobulins in monomeric form, reducing the presence of aggregated forms and other impurities, thereby enhancing the purity and safety of biopharmaceuticals.
Implementation Method 1
applying an aqueous, buffered solution comprising an immunoglobulin in monomeric and in aggregated form to a membrane cation exchange material under conditions whereby at least 90 % of the immunoglobulin in monomeric form does not bind to the membrane cation exchange material
Data Source
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AI summary
The current invention reports a method for purifying an immunoglobulin, wherein the method comprises applying an aqueous, buffered solution comprising an immunoglobulin in monomeric and in aggregated form to a cation exchange material under conditions whereby the immunoglobulin in monomeric form does not bind to the cation exchange material, and recovering the immunoglobulin in monomeric form from the solution after the contact with the cation exchange material.