HPCMP Protein Separation via Diffusion-Driven Hollow Fiber Membranes
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Solution Overview
Problem
High Performance Tangential Flow Filtration (HPTFF) systems face challenges with membrane fouling, difficulty in achieving selectivity between similarly-sized products and impurities, and high buffer consumption, particularly in diafiltration processes, and require expensive membrane modules.
Innovation Solution
The implementation of a High Performance Countercurrent Membrane Purification (HPCMP) system using low-cost hollow fiber membranes for continuous, diffusion-driven membrane processes with minimal fouling and low buffer consumption, allowing for high-resolution protein separations and the removal of non-protein impurities, and the option to use single-use or regenerable membranes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pressure-driven TFF is used for protein separation, then separation capability is improved, but membrane fouling increases and selectivity between similarly-sized proteins deteriorates
Solution Approach 1:
The patent replaces the pressure-driven mechanical filtration system with a diffusion-driven system. Instead of using transmembrane pressure to force feed through the membrane, the system uses concentration gradients and diffusive transport to achieve separation. This substitution eliminates the mechanical stress that causes membrane fouling while maintaining separation capability through controlled diffusion processes.
Solution Approach 2:
The patent changes the operating parameters from high pressure conditions to low pressure/diffusion-dominated conditions. By operating below the transition point in the filtrate flux vs. transmembrane pressure curve and using countercurrent flow configurations, the system achieves high selectivity for similarly-sized proteins without the fouling associated with pressure-driven operations.
2Manufacturing precision
If HPTFF is used for high selectivity separation, then separation resolution is improved, but buffer consumption increases significantly
Solution Approach 1:
The patent implements a continuous countercurrent diffusion process where fresh buffer continuously contacts the retentate side and concentrated feed continuously contacts the permeate side. This continuous countercurrent exchange maintains high concentration gradients throughout the membrane area, achieving high separation resolution with reduced buffer consumption compared to batch diafiltration methods.
3Manufacturing precision
If expensive specialized membranes are used for HPTFF, then separation performance is improved, but capital cost increases
Solution Approach 1:
The patent employs inexpensive, commercially available hollow fiber membranes that can be used as single-use or easily regenerated components. By using diffusion-driven operation at low pressures, the membranes are not subjected to the harsh conditions that require expensive specialized membranes, allowing the use of standard, low-cost membrane materials.
4Productivity
If pressure-driven filtration is used, then filtration speed is improved, but membrane fouling and operational complexity increase
Solution Approach 1:
The patent replaces pressure-driven filtration with diffusion-driven transport. Instead of using pumps and pressure control systems to achieve filtration, the system relies on natural concentration gradients and diffusive flux. This substitution reduces mechanical complexity while maintaining productive separation through continuous countercurrent operation.
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
HPCMP achieves high yield separations with reduced operational and capital costs, providing over 90% target yield and high purity of proteins, while minimizing membrane fouling and buffer usage, and can be applied to various biotherapeutic and protein separation applications.
Implementation Method 1
continuous, diffusion-driven membrane processes
Implementation Method 2
low-cost hollow fiber membranes
Data Source
AI summary
Protein separation can be provided based on a High Performance Countercurrent Membrane Purification (HPCMP), which can exploit highly selective diffusive transport across thin walls of a hollow fiber membrane for separation of proteins. Embodiments of an HPCMP system can separate mixtures of multiple proteins (e.g. separate BSA and Mb) or other biological material and provide high yields (e.g. achieving greater than 98% yield of both proteins with purification factors greater than 100-fold, etc.). Embodiments of a HPCMP system can be configured for high resolution separations in the preparation of biopharmaceuticals and natural protein products. Other embodiments can be utilized in other protein separation environments or biological material separation environments.