Intermittent Perfusion Fed-Batch Culture for Toxic Metabolite Removal
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Solution Overview
Problem
Current cell culture methods for recombinant protein production, such as fed-batch and perfusion, face challenges in maintaining cell viability and productivity due to toxic metabolite accumulation, high costs, and complex facility requirements, which limit their effectiveness and efficiency.
Innovation Solution
The Intermittent Perfusion Fed-Batch (IPFB) modality integrates intermittent perfusion phases into the fed-batch process, using a cell retention device to exchange spent medium with fresh medium, thereby maintaining cell health and extending culture duration, reducing medium usage, and enhancing productivity and product quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fed-batch culture is used for recombinant protein production, then operational simplicity is maintained, but cell viability decreases and productivity is limited due to toxic metabolite accumulation
Solution Approach 1:
The patent implements intermittent perfusion where fresh medium is added periodically (e.g., every 2-5 days) rather than continuously, maintaining operational simplicity while achieving toxic metabolite removal. This periodic medium exchange restores cell viability and extends productive culture duration without requiring continuous perfusion infrastructure
Solution Approach 2:
The patent extracts and removes toxic metabolites (lactate, ammonium) from the culture medium through periodic perfusion medium exchange. By removing these harmful accumulation products, cell viability is restored and productivity is extended without changing the fundamental fed-batch operation mode
2Productivity
If perfusion culture is used to extend culture duration and improve productivity, then cell viability is maintained, but capital investment and manufacturing cost increase significantly
Solution Approach 1:
The patent applies partial perfusion action by performing medium exchange only during specific culture phases (middle to late stage) rather than continuous perfusion from the beginning. This partial application achieves the vital benefit of toxic metabolite removal while avoiding the excessive capital investment and complexity of full perfusion infrastructure
Solution Approach 2:
The patent segments the culture process into distinct phases: initial fed-batch growth phase, intermediate intermittent perfusion phase, and extended production phase. This segmentation allows using simple fed-batch equipment for growth, then adding intermittent perfusion only when needed, avoiding full perfusion facility requirements throughout
3Duration of action of moving object
If perfusion culture is implemented for continuous medium exchange, then culture duration is extended, but medium consumption and disposal costs increase
Solution Approach 1:
The patent uses periodic intermittent perfusion where medium is exchanged at specific intervals (e.g., every 2-5 days) rather than continuously. This periodic approach extends culture duration by removing toxic metabolites at critical phases while consuming significantly less medium compared to continuous perfusion
Solution Approach 2:
The patent discards only the toxic metabolite-containing spent medium through intermittent exchange while retaining and reusing the majority of the culture medium and cells. This selective discarding approach extends culture duration without proportionally increasing medium consumption and disposal costs
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
IPFB culture improves productivity by up to 150% and product quality, while minimizing medium consumption and operational costs, compared to conventional methods, and is adaptable to various manufacturing processes.
Implementation Method 1
using a cell retention device to exchange spent medium with fresh medium
Data Source
AI summary
Provided is a method of intermittent perfusion fed-batch culture, comprising a fed-batch process including one or more intermittent perfusion phases during the middle to late stage to improve productivity and product quality.