High Salt Elution Reduces Turbidity in Antibody Purification
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Solution Overview
Problem
Current Protein A affinity chromatography methods for monoclonal antibody purification often result in turbid elution pools and high column backpressure during viral inactivation, leading to increased costs and operational challenges due to the need for larger filtration areas and longer processing times.
Innovation Solution
The process involves eluting antibodies using a high salt concentration, specifically between 100 mM to 200 mM, at acidic pH levels, to reduce turbidity and precipitation during viral inactivation and neutralization, thereby improving the filtration capacity and reducing the required filtration area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If acidic pH elution is used in Protein A chromatography, then antibody purification efficiency is improved, but turbidity increases during viral inactivation
Solution Approach 1:
The patent changes the salt concentration parameter in the elution buffer from conventional low levels to high levels (150-500 mM NaCl or equivalent). This parameter modification allows the elution to proceed at acidic pH for efficient purification while the high salt concentration prevents protein aggregation and precipitation during subsequent viral inactivation, thereby controlling turbidity without sacrificing purification efficiency
Solution Approach 2:
The high salt concentration is introduced beforehand in the elution buffer to prevent the formation of turbid precipitates during the subsequent viral inactivation step. This preemptive measure ensures that the protein solution remains clear throughout the process, avoiding the need for additional clarification steps
2Productivity
If acidic pH elution is used in Protein A chromatography, then antibody purification is enhanced, but column backpressure increases
Solution Approach 1:
The patent modifies the ionic strength parameter of the elution buffer by increasing salt concentration to 150-500 mM. This change reduces protein-protein interactions and aggregation in the eluate, preventing clogging in downstream filtration systems and thereby reducing column backpressure while maintaining effective antibody purification
3Object-generated harmful factors
If high salt concentration is used during elution, then turbidity is reduced during viral inactivation, but elution buffer complexity increases
Solution Approach 1:
The patent adjusts the salt concentration parameter to an optimized range (150-500 mM) that effectively prevents turbidity formation. While this increases buffer complexity compared to conventional elution buffers, the change remains within the scope of standard buffer preparation practices and provides significant benefits in process reliability and product quality
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 significantly decreases turbidity in the eluted protein mixture, enhancing the filtration process efficiency and reducing the need for larger filter areas, thus lowering operational costs and improving the overall purification process.
Implementation Method 1
Monoclonal antibody is widely purified by Protein A affinity chromatography. Affinity chromatography has several advantages since it is an easy, fast, and selective procedure for capturing the target protein.
Implementation Method 2
the elution is performed at a high salt concentration which provides less turbidity or precipitation in eluted composition during virus inactivation & neutralization compared to elution performed at low salt concentration
Implementation Method 3
a chemical inactivation of enveloped viruses by denaturation of the envelope proteins is typically performed. Generally, this inactivation step is performed at pH 3.0-4.0.
Data Source
AI summary
A process for purification of antibody or fusion protein by affinity chromatography wherein the elution is performed with high salt concentration which reduce turbidity in protein mixture during neutralization steps. The present invention provides an improved process of purifying antibodies through affinity chromatography using high salt-based elution.