Dextran-Coated Magnetic Beads for High-Purity Cell Isolation
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Solution Overview
Problem
Current cell separation techniques face limitations in yield, purity, viability, and functionality of isolated cells, particularly in recovering rare cells and improving throughput.
Innovation Solution
The method employs a chromatographic approach optimized with a dextran molecule as a carrier for ligand binding partners like Strep-Tactin, achieving an avidity effect through polymerization/multimerization, and using bivalent tagging agents or linking molecules to enhance cell isolation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional cell separation techniques are used, then cell isolation can be performed, but yield and purity of isolated cells are limited
Solution Approach 1:
The invention uses composite bead structures combining magnetic particles with dextran polymer coating. The magnetic core provides separation capability while the dextran shell provides binding sites for antibodies, creating a composite material that achieves both high purity through magnetic separation and high yield through enhanced cell binding capacity
Solution Approach 2:
The dextran coating on magnetic beads creates a porous structure with high surface area and multiple binding sites. This porous matrix allows simultaneous binding of multiple antibodies per bead, increasing the efficiency of rare cell isolation while maintaining high purity through the magnetic separation mechanism
2Reliability
If conventional cell separation techniques are used, then cell isolation can be performed, but viability and functionality of isolated cells are compromised
Solution Approach 1:
The invention replaces harsh mechanical filtration or centrifugation methods with gentle magnetic field-based separation. Cells bound to magnetic beads are separated by applying a magnetic field, which exerts minimal mechanical stress on cells compared to traditional methods, thereby maintaining high viability while achieving pure isolation
Solution Approach 2:
The magnetic beads act as intermediaries between the antibody binding and the separation process. Antibodies bind to cell surface antigens, which are then captured by the magnetic beads. This intermediary system allows pure separation through magnetic fields without direct mechanical manipulation of cells, preserving their viability and functionality
3Productivity
If conventional cell separation techniques are used, then isolation can be performed, but throughput and efficiency are limited
Solution Approach 1:
The invention optimizes multiple parameters including bead size distribution, dextran coating thickness, antibody concentration, and magnetic field strength. These parameter optimizations enable high-throughput processing while maintaining pure separation, as the tuned parameters maximize binding efficiency and separation speed without compromising purity
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 results in high yields and purity of isolated cells, such as CD4+ cells, while maintaining cell viability and functionality, and is particularly effective for isolating cells with low abundant surface antigens.
Implementation Method 1
achieve an avidity effect through polymerization/multimerization
Implementation Method 2
providing at least two tagging agents (3) each comprising at least one binding domain (4) capable of specifically binding to the antigen (2) on the biological entity
Implementation Method 3
the binding of the biological entity (1) via the tagging agent (3) to the carrier (11) and the binding of the linking molecule (10) via the tagging agent (3) to the carrier (11) and the binding of the linking molecule (10) to the stationary phase are mediated by non-covalent protein-ligand interaction
Implementation Method 4
purifying the biological entity (1) by a chromatographic procedure
Data Source
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AI summary
Provided are affinity-based methods of isolating biological entities via a surface antigen from a sample with non-chromatographic and chromatographic methods being provided. Also provided is a dextran polymer, kits for use in the method of isolating a biological entity and an apparatus for performing the methods.