L-Cysteine/N-Acetylcysteine Feed Medium for Culture Stability
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Solution Overview
Problem
Media used in cell culture are often physically or chemically unstable, leading to negative impacts on cell culture processes, particularly at industrial scales, affecting the productivity and cost of producing recombinant proteins such as antibody drugs.
Innovation Solution
A feed medium containing specific concentrations of L-cysteine and N-acetylcysteine, with a defined molar ratio and pH, is used to enhance the stability of the medium, preventing component precipitation and maintaining viability of cells during culture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional cell culture media are used, then cell culture can be performed, but the media are physically or chemically unstable leading to component changes and precipitation
Solution Approach 1:
The patent applies parameter changes by adjusting the concentration ranges of L-cysteine (10-40 mM) and N-acetylcysteine (1-40 mM) in the feed medium, along with controlling their molar ratio (0.04-1.0), to optimize media stability and prevent component precipitation during cell culture
Solution Approach 2:
The patent uses N-acetylcysteine as an intermediary substance that works together with L-cysteine to stabilize the media composition. The combination of these two compounds prevents oxidative degradation and component precipitation, thereby improving media stability and cell culture reliability
2Productivity
If media components change during preparation, storage, or cell culture, then productivity decreases, but preventing all changes is difficult
Solution Approach 1:
The patent applies preliminary action by pre-establishing optimal concentration ranges and ratios of L-cysteine and N-acetylcysteine in the feed medium before cell culture begins. This preliminary configuration of stable media composition prevents component changes during subsequent preparation, storage, and culture processes, thereby maintaining productivity
3Productivity
If industrial scale cell culture is performed, then production volume increases, but media instability becomes more problematic
Solution Approach 1:
The patent addresses industrial scale challenges by defining specific concentration ranges (L-cysteine: 10-40 mM, N-acetylcysteine: 1-40 mM) and molar ratios (0.04-1.0) that maintain media stability even at large production volumes. These parameter optimizations ensure consistent media performance from lab scale to industrial scale operations
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
The solution improves the stability of cell culture media, ensuring consistent production of recombinant proteins by reducing component changes and maintaining cell viability, thereby enhancing productivity and reducing costs.
Implementation Method 1
Media used in cell culture are often physically or chemically unstable, components may change during preparation, during storage, and/or during cell culture
Implementation Method 2
A feed medium containing 10-40 mM L-cysteine and 1-40 mM N-acetylcysteine
Data Source
AI summary
Provided are a method, an agent, or the like for improving the stability of a medium and for improving the productivity of a recombinant protein. Specifically, provided are: a medium containing N-acetylcysteine and L-cysteine; a method for culturing a cell using a medium containing N-acetylcysteine and L-cysteine; a method for producing a recombinant protein using a medium containing N-acetylcysteine and L-cysteine; and a method, agent, or the like for stabilizing a medium containing L-cysteine using N-acetylcysteine.