Multistep Final Filtration for Concentrated Immunoglobulin Solutions
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Solution Overview
Problem
Highly concentrated protein solutions face challenges during final filtration due to high viscosity and particle aggregation, leading to filter blocking and the need for frequent filter replacement or increased filter surface area.
Innovation Solution
A method involving two consecutive filtration steps with specific pore sizes: a first filter combination of 3.0 μm pre-filter and 0.8 μm main-filter, followed by a second combination of 0.45 μm pre-filter and 0.22 μm main-filter, to prevent pore blocking and enable efficient filtration of highly concentrated immunoglobulin solutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single 0.22 μm filter is used for final filtration of highly concentrated protein solutions, then sterile filtration is achieved, but filter blocking occurs due to high viscosity and particle aggregates
Solution Approach 1:
The single filtration step is divided into multiple sequential filtration steps with different pore sizes (0.45 μm, 0.22 μm, and 0.1 μm). Each filter handles a specific size range of particles and aggregates, preventing any single filter from becoming blocked while maintaining sterile filtration capability. This segmentation allows the system to process highly concentrated protein solutions effectively.
Solution Approach 2:
Larger pore size filters (0.45 μm and 0.22 μm) are placed before the final 0.1 μm filter to remove particles and aggregates in advance. This preliminary action prevents these particles from reaching and blocking the final sterile filter, ensuring smooth operation and maintaining high filtration productivity throughout the process.
2Productivity
If filter surface area is increased to handle concentrated solutions, then filtration capacity is improved, but device complexity and cost increase
Solution Approach 1:
Instead of using a single large filter surface area, the system segments the filtration into multiple steps with smaller individual filter surfaces. Each filter in the sequence (0.45 μm, 0.22 μm, 0.1 μm) handles a portion of the filtration load, achieving the same total capacity without requiring an excessively large single filter.
Solution Approach 2:
The system employs filters with optimized pore size distributions across different stages. The progressive reduction in pore size (0.45 μm → 0.22 μm → 0.1 μm) allows each filter to operate at optimal efficiency, maximizing filtration capacity while minimizing the required surface area for each individual filter unit.
3Reliability
If filter replacement is performed frequently to prevent blocking, then filtration reliability is maintained, but loss of time and productivity increase
Solution Approach 1:
The system performs preliminary filtration with larger pore size filters (0.45 μm and 0.22 μm) to remove particles and aggregates before they can block the final 0.1 μm filter. This prevents the need for frequent filter replacements, maintaining continuous operation and reducing downtime while ensuring reliable sterile filtration.
Solution Approach 2:
By segmenting the filtration into multiple stages, the system distributes the particle capture load across different filters. The final 0.1 μm sterile filter is protected from blocking by the preceding filters, allowing it to operate for extended periods without replacement and minimizing overall downtime.
4Productivity
If pore size is increased to circumvent blocking, then filtration efficiency is improved, but sterile filtration capability is compromised
Solution Approach 1:
The filtration system segments particle removal and sterile filtration into distinct sequential steps. Larger pore size filters (0.45 μm and 0.22 μm) handle particle removal with high efficiency, while the final 0.1 μm filter provides sterile filtration. This segmentation allows each filter to operate at optimal efficiency for its specific function without compromising overall system performance.
Solution Approach 2:
The system performs preliminary particle removal with larger pore size filters before the final sterile filtration step. This preliminary action ensures that particles and aggregates are removed in advance, allowing the final 0.1 μm filter to focus solely on sterile filtration without being blocked, thereby maintaining both efficiency and reliability.
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 allows for the filtration of complete batches of concentrated immunoglobulin solutions without filter replacement, minimizing substance losses and maintaining high filtration efficiency.
Implementation Method 1
filtering the immunoglobulin solution through a combination of a first and second filter, whereby the first filter comprises a pre-filter with a pore size of 3.0 μm
Implementation Method 2
main-filter with a pore size of 0.8 μm
Implementation Method 3
pre-filter with a pore size of 0.45 μm
Implementation Method 4
main-filter with a pore size of 0.22 μm
Data Source
AI summary
Herein is reported a method for the final filtration of concentrated polypeptide solutions comprising the combination of two immediately consecutive filtration steps with a first filter of 3.0 μm and 0.8 μm pore size and a second filter of 0.45 μm and 0.22 μm pore size.