Composite Depth Filter Media for Low Extractables
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Solution Overview
Problem
Traditional depth filter media in the biotech industry has limitations in reducing pre-use flushing requirements, releasing organic and inorganic extractables, and effectively removing soluble impurities like host cell proteins and DNA from cell culture/biological feedstreams, leading to interference with downstream purification processes and reduced product binding capacity.
Innovation Solution
A composite depth filter media comprising nonwoven layers with fibrillated fibers, inorganic filter aids, and wet strength resins, designed to minimize extractables, enhance dirt holding capacity, and utilize flow-through adsorption for improved retention of soluble impurities, reducing the need for extensive preflushing and minimizing organic extractables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional depth filter media (cellulose, diatomaceous earth, wet-strength resin) is used, then filtration structure and particle retention are achieved, but organic extractables (beta glucans) and inorganic extractables (metals) are released into the process stream
Solution Approach 1:
The patent removes harmful traditional materials (cellulose, diatomaceous earth, wet-strength resin) from the filter media composition and replaces them with alternative materials that do not release extractables. This extraction of harmful components eliminates the source of beta glucans and metal contaminants while maintaining filtration functionality.
Solution Approach 2:
The patent employs composite filter media made from alternative materials such as synthetic fibers, inorganic filter aids, and binding agents that are specifically selected to minimize extractable release. The composite structure combines materials with complementary properties: filtration capability, structural integrity, and low extractables profile.
2Reliability
If traditional depth filter media is used, then particle retention is achieved, but extensive preflushing is required to reduce contaminant levels
Solution Approach 1:
The filter media is pre-treated during manufacturing to minimize contaminant levels and reduce the need for extensive preflushing. The alternative materials are selected and processed to start with low extractables content, so that minimal flushing is required before use.
Solution Approach 2:
The patent changes the material composition parameters of the filter media to inherently reduce extractables release. By using materials with different chemical and physical properties than traditional media, the filter achieves particle retention without requiring extensive preflushing to remove contaminants.
3Quantity of substance
If traditional depth filter media is used, then filtration capacity is achieved, but binding capacity for soluble impurities (host cell proteins, DNA) is insufficient
Solution Approach 1:
The filter media is designed to perform multiple functions simultaneously: particle filtration, soluble impurity binding, and low extractables release. The alternative materials are selected to provide both mechanical filtration capability and adsorptive properties for binding host cell proteins and DNA, eliminating the need for separate binding steps.
Solution Approach 2:
The patent uses porous alternative materials that provide both physical filtration through pore size exclusion and increased surface area for adsorption of soluble impurities. The porous structure enables simultaneous particle retention and binding of dissolved contaminants like host cell proteins and DNA.
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 solution significantly reduces preflushing water requirements, decreases organic extractables, and increases binding capacity for host cell proteins and DNA, leading to improved filtration efficiency and reduced interference with downstream processes, thereby enhancing the operational lifetime of chromatography media.
Implementation Method 1
incorporates an inorganic filter aid having a sufficient surface area and adsorptive properties to extract soluble impurities from said feedstreams
Implementation Method 2
Particle retention is thought to involve both size exclusion and adsorption through hydrophobic, ionic and other interactions
Implementation Method 3
Particle retention is thought to involve both size exclusion and adsorption through hydrophobic, ionic and other interactions
Implementation Method 4
comprising fibrillated fibers, inorganic filter aids, and wet strength resins
Data Source
AI summary
A depth filtration device for the clarification of biological fluids including a composite depth filter media having a nonwoven first layer integral with a second layer containing a polyacrylonitrile (PAN) fibers, a filter aid, and a wet-strength resin. The depth filter media exhibits increased binding capacity for soluble impurities such as DNA and host cell proteins from biological/cell culture feedstreams during secondary clarification and low-level impurity clearance of harvested cell culture fluids, such as those used for the manufacture of monoclonal antibodies. The depth filter media additionally exhibits significantly lower flushing requirements, resulting in lower levels of organic, inorganic and bioburden extractables released, high dirt holding capacities and good chemical and/or radiation resistance.