Functionalized nonwoven article
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Solution Overview
Problem
Current chromatographic techniques for biomaterial purification, such as monoclonal antibodies, face bottlenecks in throughput and are prone to contamination, leading to reduced effectiveness and high economic costs due to issues like channeling and breakthrough of products, which necessitate the development of more efficient filtration methods.
Innovation Solution
A functionalized nonwoven substrate with average fiber sizes of 0.7 to 15 microns and a void volume of 50 to 95% is created by grafting cationic aminoalkyl(meth)acryloyl monomer units onto the surface, allowing for effective filtration and separation of host cell proteins, DNA fragments, viruses, and therapeutic proteins through depth-type filtration applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional column chromatography techniques are used for biomaterial purification, then separation and purification can be achieved, but throughput is low and bottlenecks occur in downstream purification
Solution Approach 1:
The patent employs a nonwoven porous support structure with controlled porosity (50-95% void volume) and specific pore size distribution to enable high-throughput filtration. The porous architecture allows rapid fluid flow while maintaining effective separation capacity, eliminating the bottleneck issues of conventional chromatography columns.
Solution Approach 2:
The invention divides the purification process into distinct functional zones within the nonwoven substrate, including depth filtration regions and surface adsorption zones. This segmentation allows simultaneous operation of multiple separation mechanisms, increasing overall throughput while maintaining purification effectiveness.
2Productivity
If larger column diameters are used to increase throughput, then more material can be processed, but packing difficulties and channeling problems increase
Solution Approach 1:
The nonwoven porous support provides a pre-formed, uniform porous structure that eliminates packing issues entirely. The consistent pore size distribution (0.7-15 microns) and void volume (50-95%) are inherent to the nonwoven fabrication process, ensuring uniform flow distribution without channeling even in large-scale applications.
Solution Approach 2:
The invention extracts the problematic packing step from the system by using a nonwoven porous support that comes pre-formed with uniform structure. This eliminates the source of packing non-uniformity and channeling while maintaining the ability to process large volumes.
3Reliability
If conventional filtration membranes are used, then separation can occur, but they are prone to fouling and require frequent replacement
Solution Approach 1:
The patent creates a composite structure combining a nonwoven porous support with grafted polymeric functional groups. The nonwoven substrate provides mechanical strength and porous architecture resistant to fouling, while the grafted polymers provide selective adsorption capacity. This composite approach extends service life while maintaining filtration effectiveness.
Solution Approach 2:
The invention applies different functional properties to different regions of the filter: the bulk nonwoven structure provides mechanical robustness and flow channels, while the surface-grafted polymeric regions provide selective binding. This local differentiation allows the bulk structure to resist fouling while the surface performs separation, extending operational life.
4Manufacturing precision
If Protein A columns are used for selective purification, then high purity can be achieved, but contamination plugging reduces effectiveness and increases cost
Solution Approach 1:
The patent implements depth filtration and pre-cleaning functions within the nonwoven substrate structure before the feed reaches the selective adsorption zone. This preliminary removal of particulates and bulk contaminants prevents plugging of the high-purity Protein A binding sites, maintaining column effectiveness and reducing replacement costs.
Solution Approach 2:
The filter is segmented into upstream depth filtration zones that handle bulk contamination removal and downstream selective adsorption zones for high-purity separation. This segmentation protects the high-purity function from fouling while maintaining overall purification effectiveness.
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 functionalized substrate enhances filtration efficiency by maintaining high throughput and low pressure drops, effectively removing biocontaminants without fouling, and extends the life of downstream filtration membranes by protecting them from contamination.
Implementation Method 1
a polymer comprising cationic aminoalkyl(meth)acryloyl monomer units grafted to the surface of the nonwoven substrate
Implementation Method 2
a nonwoven substrate having average fiber sizes of 0.7 to 15 microns, and a void volume of 50 to 95%
Data Source
AI summary
A grafted nonwoven substrate is disclosed having average fiber sizes of 0.7 to 15 microns, and a void volume of 50 to 95%, and a polymer comprising cationic aminoalkyl(meth)acryloyl monomer units grafted to the surface of the nonwoven substrate. The article may be used as a filter element to purify or separate target materials, such as oligonucleotides or monoclonal antibodies (MAb), from a fluid mixture.