Magnetic Nanoparticle Composite for Nucleic Acid Purification
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Solution Overview
Problem
Current magnetic beads for nucleic acid purification are less effective in magnetic separation due to leaching of magnetic particles from the carrier matrix, and their production is cumbersome, making them economically inefficient and unsuitable for subsequent applications like PCR.
Innovation Solution
A particulate solid composite material with magnetic nanoparticles embedded in a polymer carrier matrix obtained by polyaddition of isocyanate-reactive monomers, which enhances the incorporation and retention of magnetic particles, improving handling and performance in magnetic separation and allowing for simpler production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic particles are used in carrier matrix for nucleic acid purification, then magnetic separation capability is improved, but magnetic particles leach from the carrier matrix reducing separation efficiency
Solution Approach 1:
The patent uses a composite material system consisting of magnetic nanoparticles embedded in a polymer carrier matrix. The magnetic nanoparticles (Fe3O4 or Fe2O3) are combined with a polymeric carrier material that provides structural support and prevents particle leaching. This composite structure maintains magnetic separation efficiency while preventing particle loss during purification processes.
Solution Approach 2:
The magnetic nanoparticles are nested within the polymer carrier matrix structure. The carrier matrix acts as a container or host that encapsulates the magnetic particles, preventing them from leaching while still allowing magnetic field penetration. This nested configuration ensures particles remain trapped within the carrier during handling and separation operations.
2Manufacturing precision
If complex production methods are used for magnetic beads, then particle incorporation is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent combines the magnetic nanoparticles and polymer carrier material in a single integrated production process. Rather than separately coating particles with complex multi-step procedures, the method merges the incorporation step with the carrier formation process, achieving good particle distribution and retention through a simplified unified approach.
Solution Approach 2:
The patent optimizes production parameters such as particle size (5-50 μm), magnetic particle concentration (1-50 wt%), and polymer composition to achieve effective particle incorporation. By carefully controlling these parameters, the method achieves good manufacturing precision without requiring complex multi-step processes or specialized equipment.
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 composite material provides improved magnetic separation efficiency, reduced leaching of magnetic particles, and economic viability, making it suitable for nucleic acid purification and subsequent applications such as PCR.
Implementation Method 1
The loaded magnetic beads can subsequently be washed with at least one wash solution. After the wash step is completed, the loaded magnetic beads can be collected by magnetic separation when a magnetic field is applied.
Implementation Method 2
A particulate solid composite material with magnetic nanoparticles embedded in a polymer carrier matrix obtained by polyaddition of isocyanate-reactive monomers
Data Source
AI summary
Particulate solid composite material for purifying nucleic acids containing magnetic nanoparticles embedded in a carrier matrix based on at least one polymer that is obtained by polyaddition ofa) at least one isocyanate-reactive monomer A, selected from compounds containingat least two functional groups, each having at least one Zerewitinoff-reactive hydrogen atom, andin addition to these at least two functional groups, carry at least one anionic or potentially anionic residue, preferably selected from the group consisting of carboxylate, sulfonate or combinations thereof,withb) at least one polyisocyanate monomer Bwith the provisio that said polyaddition occurs in the presence of magnetic nanoparticles,is particularly suitable as carrier material for purification of nucleic acids. Said composite material is easy to prepare, is stable, and magnetic and has outstanding application properties in the bind-wash-elute purification of nucleic acids using magnetic separation.