Macroporous Anion Exchange Resins for High-Flow Chromatography
Solution Overview
Problem
Current anion exchange resins face challenges such as non-specific interactions due to hydrophobic backbones, low porosity, and unsuitability for high-flow rate chromatographic purifications, limiting their effectiveness in separating and purifying biological molecules.
Innovation Solution
The development of macroporous anion exchange resins using a monomer mixture with a crosslinking monomer and a positively charged ionic monomer, along with a water-soluble porogen, to create particles with controlled pore size and surface area, enhancing their capacity and mechanical strength for use in chromatographic columns and filtration elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If styrene/divinylbenzene copolymer resins are used, then anion exchange capacity is improved, but non-specific interactions increase due to hydrophobic backbone
Solution Approach 1:
The patent changes the chemical composition parameters by using (meth)acrylic-type monomers instead of styrene/divinylbenzene copolymers, and controls the lipophilicity index to be less than or equal to 20. This parameter change eliminates the hydrophobic backbone while maintaining anion exchange capacity through the use of charged groups on the polymer backbone.
Solution Approach 2:
The patent creates a composite resin structure combining (meth)acrylic polymer backbone with charged groups, crosslinking agents, and porogens. This composite approach allows the material to have both hydrophilic properties (reducing non-specific interactions) and high anion exchange capacity through the integrated charged functional groups.
2Object-generated harmful factors
If crosslinked agarose resins are used, then non-specific interactions are reduced, but mechanical strength and suitability for high flow rate decrease
Solution Approach 1:
The patent changes the polymer type from agarose to (meth)acrylic-type polymers with controlled crosslinking. The crosslinking monomer content is controlled to provide adequate mechanical strength while maintaining the hydrophilic nature of the polymer backbone to reduce non-specific interactions.
Solution Approach 2:
The patent applies crosslinking locally through controlled crosslinking monomers (N,N'-alkylenebis(meth)acrylamide or N,N'-heteroalkylenebis(meth)acrylamide) rather than complete crosslinking of the entire polymer matrix. This local crosslinking approach provides mechanical reinforcement while preserving the overall hydrophilic character and porosity of the resin.
3Object-generated harmful factors
If conventional (meth)acrylic resins are used, then hydrophobicity is reduced, but porosity and capacity are low
Solution Approach 1:
The patent incorporates porogens (water-soluble compounds like polyethylene glycol, polypropylene glycol, or their combinations) during the polymerization process. These porogens create macropores within the polymer matrix, achieving both high porosity (0.3-0.7) and high capacity while maintaining the hydrophilic nature of the (meth)acrylic backbone.
Solution Approach 2:
The porogen is incorporated into the polymerization process beforehand, during the formation of the polymer matrix. This preliminary action ensures that the porous structure is built into the material from the start, rather than being added later, achieving optimal porosity and capacity simultaneously.
4Object-generated harmful factors
If gel-type resins are used, then hydrophobicity is reduced, but mechanical strength and flow rate suitability are compromised
Solution Approach 1:
The patent changes the physical state from gel to macroporous particle by controlling the crosslinking degree and incorporating porogens. The resulting resins have a particle morphology with open pore structure rather than gel network, providing both mechanical strength and high flow rate suitability while maintaining low hydrophobicity.
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 macroporous anion exchange resins demonstrate improved anion exchange capacity, mechanical strength, and reduced non-specific adsorption, enabling efficient separation and purification of biological molecules, even at high flow rates, while maintaining low impurity adsorption.
Implementation Method 1
polymerizing the monomer mixture to form particles of polymeric material
Implementation Method 2
removing the porogen from the particles
Implementation Method 3
adsorbing at least a portion of the negatively charged material on the macroporous anion exchange resin
Data Source
AI summary
Methods of making macroporous anion exchange resins are described. The macroporous anion exchange resins are in the form of particles such as beads that contain a hydrophilic, crosslinked, (meth)acrylic-type polymeric material. Additionally, methods of purifying a negatively charged material using the macroporous anion exchange resins, methods of making chromatographic columns that contain the macroporous anion exchange resins, methods of making filter elements that contain the macroporous anion exchange resins, and methods of making porous composite materials that contain the macroporous anion exchange resins are described.