Single-Pass Countercurrent Diafiltration for Bioprocessing
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Solution Overview
Problem
Traditional diafiltration systems for biologic products require large buffer volumes, complex pumping systems, and significant equipment size, which increases costs and reduces manufacturing flexibility, while also impacting the biologic product and consuming excessive diafiltration buffer.
Innovation Solution
The development of single-pass, countercurrent diafiltration systems that use a reduced number of TFF cassettes and a stepwise diafiltration process with countercurrent flow, significantly reducing the number of pump passes and diafiltration buffer usage, and enabling smaller equipment sizes suitable for single-use materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If traditional TFF systems are used for diafiltration, then buffer exchange can be achieved, but diafiltration buffer consumption is excessive and equipment size is large
Solution Approach 1:
The system divides the diafiltration process into multiple stages (typically 3-5 stages) with each stage performing a portion of the buffer exchange. This segmentation allows the process to achieve high diafiltration volumes with smaller individual equipment units and reduced overall buffer consumption compared to single-stage traditional systems.
Solution Approach 2:
The system inverts the traditional diafiltration approach by using a counter-current flow configuration where fresh buffer is introduced at the final stage and flows backward through previous stages. This inversion allows the retentate to be progressively diluted with fresher buffer at each stage, achieving efficient buffer exchange with reduced consumption and smaller equipment footprint.
2Object-affected harmful factors
If traditional TFF systems are used for diafiltration, then buffer exchange can be achieved, but the number of pump passes is high causing impact on biologic product
Solution Approach 1:
By segmenting the diafiltration process into multiple stages with controlled flow rates, the system reduces the number of pump passes required compared to traditional single-stage systems. Each stage operates at optimized flow conditions that minimize shear stress and pump exposure on the biologic product while maintaining effective buffer exchange.
Solution Approach 2:
The counter-current flow configuration inverts the traditional approach, allowing the retentate to flow through stages in reverse order of buffer introduction. This inversion enables the biologic product to experience gentler flow conditions and fewer pump passes while still achieving complete buffer exchange, as each stage progressively replaces buffer with minimal product stress.
3Loss of substance
If multi-stage countercurrent diafiltration is implemented, then buffer consumption is reduced, but system complexity increases
Solution Approach 1:
The system segments the diafiltration process into multiple stages, each with dedicated buffer inlet and outlet connections. This segmentation, while appearing complex, is actually simplified by modular design where each stage can be independently configured and operated, allowing reduced buffer consumption through optimized flow distribution across stages.
Solution Approach 2:
The counter-current configuration inverts the traditional buffer flow direction, introducing fresh buffer at the final stage and having it flow backward through previous stages. This inversion creates a sophisticated buffer utilization pattern that maximizes buffer efficiency and reduces consumption, while the modular stage design keeps system complexity manageable through standardized connections.
4Adaptability or versatility
If traditional batch diafiltration is used, then process simplicity is maintained, but manufacturing flexibility is reduced
Solution Approach 1:
The system segments the diafiltration process into multiple independent stages that can be operated in various configurations (batch, continuous, or hybrid modes). This segmentation provides manufacturing flexibility by allowing different operational modes for different product requirements, while each stage maintains relatively simple individual design that doesn't overly increase overall process complexity.
Solution Approach 2:
The counter-current flow configuration provides adaptable buffer exchange efficiency that can be tuned for different manufacturing scenarios. By inverting the traditional buffer flow approach and using multiple stages, the system achieves high buffer efficiency that reduces consumption across different operating modes, while the modular architecture maintains manageable process complexity through standardized stage designs.
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 reduces the impact on biologic products, decreases diafiltration buffer consumption by at least 60%, and minimizes equipment size, allowing for more efficient and flexible bioprocessing with reduced operational costs and improved manufacturing efficiency.
Implementation Method 1
The TFF membrane allows components smaller than the molecular weight cut off to pass through the filter and into the permeate stream directed to waste, while larger components are retained in the retentate stream
Implementation Method 2
Diafiltration is a dilution process that involves removal or separation of components of a solution based on their molecular size by using micro-molecule permeable filters
Implementation Method 3
Diafiltration is a dilution process that involves removal or separation of components of a solution based on their molecular size by using micro-molecule permeable filters in order to obtain pure solution. Diafiltration is performed for buffer exchange during formulation of a biologic product to achieve appropriate buffer composition.
Data Source
AI summary
Systems and methods for single-pass, countercurrent diafiltration of a fluid feed are provided. The systems and methods operate to reduce impact on the biologic product, reduce use of diafiltration buffer and reduce equipment size compared to traditional systems.