Antibody Purification via pH-Adjusted Protein A Capture
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Solution Overview
Problem
The existing methods for purifying monoclonal antibodies are inefficient, particularly with the increase in cell culture titers leading to capture limitations, resulting in a bottleneck in commercial facilities due to the need for larger chromatography columns and more process steps, which complicates the purification process and increases operational costs.
Innovation Solution
A method involving a multi-step process including affinity chromatography, pH adjustment, anion exchange chromatography, cation exchange chromatography, virus filtration, and ultrafiltration to purify antibodies, utilizing specific buffers and resins such as MabSelect SuRe and Capto Q, to achieve high purity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If larger chromatography columns are used to handle increased cell culture monoclonal antibody titers, then the capture capacity is improved, but the space and time needed for purification increases
Solution Approach 1:
The patent changes the chemical parameters of the elution buffer by adjusting pH and adding specific salts (sodium caprylate, arginine) to optimize antibody elution from Protein A resin, improving capture efficiency without requiring larger columns
Solution Approach 2:
The patent develops a universal purification platform that can handle multiple monoclonal antibody types using the same sequence of chromatography steps and resin types, eliminating the need for custom process development for each antibody and reducing overall processing time
2Productivity
If more chromatography cycles are performed to increase productivity, then the monoclonal antibody yield is improved, but the space and time needed for purification increases
Solution Approach 1:
The patent performs preliminary optimization of buffer conditions and chromatography parameters before actual purification runs, allowing for fewer but more efficient cycles that achieve high yield without excessive time investment
Solution Approach 2:
The patent implements a continuous multi-step chromatography process where each step seamlessly transitions to the next, minimizing idle time and maintaining continuous productive action throughout the purification sequence
3Reliability
If multiple process buffers and resins are used for different monoclonal antibodies, then the purification effectiveness is improved, but the operational complexity and bottleneck increases
Solution Approach 1:
The patent establishes a universal purification platform using the same sequence of chromatography steps and resin types for multiple different monoclonal antibodies, maintaining high purification effectiveness while dramatically reducing operational complexity
Solution Approach 2:
The patent divides the purification process into distinct functional segments (capture, intermediate purification, final polishing) where each segment uses optimized conditions, allowing standardization across different antibodies while maintaining effectiveness
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 significantly improves the purity and yield of monoclonal antibodies, reducing host cell protein and DNA content, and allows for a more streamlined and efficient purification process, capable of handling higher antibody titers with reduced operational complexity and costs.
Implementation Method 1
Affinity chromatography, such as Protein A chromatography, or ion exchange chromatography is often used as a capture step
Implementation Method 2
Intermediate purification or polishing steps are often accomplished by affinity chromatography, ion exchange chromatography, or hydrophobic interaction chromatography (HIC)
Implementation Method 3
virus deactivation and filtration steps are included throughout the process
Implementation Method 4
subjecting the virus filtration product from step (e) to ultrafiltration to recover the purified antibody
Data Source
AI summary
The disclosure provides methods for the isolation, separation, and purification of antibodies. The method comprises an affinity chromatography capture step, anion exchange chromatography polishing step, and cation exchange chromatography polishing step.