Affinity Chromatography Re-Elution for Low-Salt Bispecific Purification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing chromatography methods for purifying bispecific antibodies face challenges in achieving robust separation of heterodimers from homodimers while managing high salt concentrations, leading to inefficiencies in yield and increased costs due to the need for multiple columns and additional processing steps like ultrafiltration or diafiltration.
Innovation Solution
A method involving a single affinity chromatography column is used, where an intermediate eluate is re-applied with a lower salt concentration buffer, followed by a wash and elution process to achieve a low-salt eluate, minimizing the presence of high molecular weight species and reducing costs by eliminating the need for separate columns and additional processing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high salt concentration buffer is used for elution in affinity chromatography, then protein product separation from impurities is improved, but compatibility with downstream process steps deteriorates
Solution Approach 1:
The elution process is divided into multiple sequential steps: first elution with high salt buffer to capture and initially elute the protein, followed by a second elution with low salt buffer to further purify and exchange the buffer. This segmentation allows the process to achieve both high separation efficiency and downstream compatibility that a single-step elution cannot provide.
2Manufacturing precision
If multiple chromatography columns are used for purification, then purification effectiveness is improved, but process complexity and cost increase
Solution Approach 1:
A single affinity chromatography column is designed to perform multiple functions: initial protein capture, first elution step, buffer exchange, and final purification. This multi-functional use of one column eliminates the need for multiple separate columns and reduces overall process complexity while maintaining high purification effectiveness.
Solution Approach 2:
The intermediate eluate from the first elution step is directly reapplied to the same column for a second elution without requiring removal or additional processing. This continuous use of the column and intermediate material maximizes the utility of each step and eliminates idle time or additional equipment needs.
3Manufacturing precision
If traditional multi-step purification process is used, then product purity is improved, but productivity and yield are reduced
Solution Approach 1:
The intermediate eluate is continuously reused by reappling it to the same column for second elution, rather than discarding it or requiring additional processing steps. This continuous utilization of material and equipment maintains high product purity while maximizing overall yield and productivity.
Solution Approach 2:
Instead of discarding the intermediate eluate after the first elution step, the process recovers and reuses it in a second elution step on the same column. This recovery approach extracts additional product that would otherwise be lost, thereby increasing overall yield while maintaining purity.
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 enhances overall product yield to about 92% and reduces costs and space requirements by reusing chromatography columns, while effectively removing salts without ultrafiltration or diafiltration, providing a suitable product stream for further processing.
Implementation Method 1
purification of heterodimeric proteins from a complex mixture of proteins via affinity chromatography
Implementation Method 2
affinity chromatography (including Protein A chromatography)
Data Source
AI summary
High resolution affinity chromatography combining affinity resolving and affinity capture processes using a single chromatography matrix results in improved resolution between closely related molecular species and significantly enhances overall product yield for large scale commercial production of heterodimeric proteins such as bispecific antibodies. Moreover, tankage and equipment requirements are reduced via the ability to reduce salt concentration, while increasing product purity and concentration, without the need for dilution, ultrafiltration or diafiltration.