Temperature-Responsive Protein A Antibody Purification
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Solution Overview
Problem
Current methods for purifying antibodies using temperature-responsive Protein A face challenges in effectively removing impurities like host cell-derived proteins and DNA, and in maintaining antibody activity, as high temperatures required for elution can reduce antibody activity and lead to detachment of Protein A from the medium.
Innovation Solution
The method involves using buffer solutions with different salt concentrations and hydrogen ion exponents in the washing and elution steps to effectively remove impurities and suppress Protein A detachment, allowing for antibody elution at a lower temperature, thereby maintaining antibody activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high temperature is used for elution in temperature-responsive Protein A chromatography, then antibody elution efficiency is improved, but antibody activity deteriorates
Solution Approach 1:
The patent changes the pH parameter of the buffer solution used during elution. By using a buffer solution with pH 5.0 or higher, the patent achieves effective antibody elution without requiring high temperatures, thus maintaining antibody activity while still achieving good elution efficiency
Solution Approach 2:
The patent employs dynamic temperature control where the column temperature is adjusted during different stages of the chromatography process. The temperature is set to 20-50°C during elution, which is higher than the binding temperature but controlled to avoid excessive heat that would damage antibody activity, creating an optimized thermal profile for both elution and preservation
2Productivity
If high temperature is used for elution, then antibody release from Protein A is improved, but Protein A detachment from medium increases
Solution Approach 1:
The patent changes the pH parameter to prevent Protein A detachment. By using a buffer solution with pH 5.0 or higher during elution, the patent maintains stable interaction between Protein A and the medium while achieving effective antibody release, thus preventing Protein A loss
Solution Approach 2:
The patent uses dynamic temperature control to optimize the elution process. By maintaining temperature at 20-50°C (moderate heating rather than high temperature), the patent achieves sufficient antibody release while preventing the excessive thermal energy that would cause Protein A to detach from the medium
3Manufacturing precision
If complex operations are used for antibody purification, then purification effectiveness is improved, but processing time increases
Solution Approach 1:
The patent combines multiple functions into a single chromatography step. By optimizing the buffer solution (pH 5.0 or higher) and temperature conditions, the patent achieves simultaneous impurity removal and antibody elution in one process, eliminating the need for separate complex operation steps
Solution Approach 2:
The patent makes the buffer solution serve multiple purposes. The buffer solution with pH 5.0 or higher is used both for maintaining antibody activity and for effective elution, while also preventing Protein A detachment. This multi-functional buffer approach simplifies the overall purification process
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 enables efficient removal of impurities and minimizes Protein A detachment, ensuring high antibody activity and purity during purification.
Implementation Method 1
methods for purifying antibodies are proposed which use variant Protein A (temperature-responsive Protein A) whose affinity for antibodies changes due to the conformational change and the like along with the temperature change
Implementation Method 2
In affinity chromatography, an antibody having a high purity and a high concentration is acquired by purification through steps of the following (A) to (C)... (A) A step (loading step) of loading a sample of a mixture of the antibody and impurities on a column
Implementation Method 3
Liquid chromatography is important for the separation and purification of antibodies. Chromatographic techniques to separate antibodies includes gel filtration chromatography, affinity chromatography, ion exchange chromatography and reversed phase chromatography
Data Source
AI summary
There is provided a method for purifying an antibody using temperature-responsive Protein A, wherein different buffer solutions are used in a washing step of washing a stationary phase having the temperature-responsive Protein A and in an elution step of eluting the antibody captured by the stationary phase, the method including the washing step of washing the stationary phase using a buffer solution at a temperature at which the temperature-responsive Protein A and the antibody are bound and having a first salt concentration, and the elution step of eluting the antibody captured by the stationary phase using a buffer solution at a temperature at which the antibody is released from the temperature-responsive Protein A and having a second salt concentration lower than the first salt concentration.