Feed Medium pH Adjustment for Precipitation Prevention
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Solution Overview
Problem
Current cell culture media for producing therapeutic proteins face challenges with precipitation issues due to pH-related solubility problems, particularly at neutral pH values, which can affect the composition and yield of recombinant proteins.
Innovation Solution
A process involving the use of a feed medium with a pH range of about 5.0 to 6.3 during the production phase in mammalian cell cultures to reduce or prevent precipitation, maintaining the stability and yield of recombinant proteins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If feed media are stored at neutral pH, then storage stability is improved, but precipitation occurs reducing composition accuracy
Solution Approach 1:
The patent applies parameter changes by adjusting the pH of concentrated feed media from neutral pH to an acidic range (pH 3.0-5.0). This parameter modification prevents precipitation of salts and other components during storage, thereby maintaining both storage stability and composition accuracy. The pH adjustment is achieved through addition of acids such as HCl or other suitable acidifying agents to the concentrated feed media before storage.
2Productivity
If concentrated feed media are used, then productivity is improved, but precipitation risk increases
Solution Approach 1:
The patent utilizes parameter changes by lowering the pH of concentrated feed media to the acidic range (pH 3.0-5.0), which significantly reduces the solubility product of salts and prevents precipitation even at high concentrations. This enables the use of highly concentrated feed media (10x-100x concentration) for improved productivity while maintaining reliability by preventing precipitation during storage and administration.
Solution Approach 2:
The patent employs acidifying agents as intermediary substances to modify the chemical environment of the concentrated feed media. These intermediaries (acids) mediate between the high concentration requirements for productivity and the precipitation prevention requirements for reliability, by adjusting ionic strength and solubility characteristics without directly participating in the biological processes.
3Stability of the object's composition
If pH is adjusted to prevent precipitation, then composition stability is improved, but cell culture performance may be impacted
Solution Approach 1:
The patent applies preliminary action by adjusting the pH of feed media to the acidic range (pH 3.0-5.0) before administration to the cell culture. This pre-adjustment ensures composition stability during storage and transport, and the acidic feed media is then diluted with culture medium at the time of administration, thereby preventing any potential negative impact on cell culture performance while maintaining composition stability throughout the 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 effectively reduces precipitation in the feed medium without impacting cell culture performance or protein yield, ensuring consistent production of recombinant proteins.
Implementation Method 1
Some components present at high concentration in feed media tend to precipitate during storage (until said media are added in the bioreactor), especially when the pH of said medium is around neutrality.
Data Source
AI summary
The present invention belongs to the field of the manufacture of recombinant proteins, particularly proteins, such as antibodies.