Magnetic Particle Core-Shell Structure for Fast Bioseparation
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Solution Overview
Problem
Magnetic particles for bioseparation have low magnetic material content, leading to slow collection and difficulty in redispersing after magnetic field removal due to residual magnetization.
Innovation Solution
A magnetic particle with a magnetic core containing an aggregation of superparamagnetic nanoparticles and a polymer layer with functional groups like carboxyl, amino, or epoxy groups, allowing for increased magnetic responsiveness and easy redispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If magnetic nanoparticles are incorporated into a polymer matrix or silica matrix, then the magnetic particle structure is formed, but the capture speed is low and sufficient performance is not obtained
Solution Approach 1:
The magnetic particle is segmented into a core-shell structure where the core contains aggregated magnetic nanoparticles and the shell is a polymer layer. This segmentation allows the magnetic material to be concentrated in the core while the polymer shell provides functional groups for bioconjugation, thereby increasing capture speed without compromising biochemical performance
Solution Approach 2:
The invention uses a composite structure combining magnetic nanoparticles (core) with a polymer matrix (shell). The magnetic nanoparticles provide high magnetic responsiveness for fast capture, while the polymer matrix provides functional groups for antibody conjugation and maintains particle stability in solution
2Productivity
If magnetic nanoparticles are incorporated at high density to increase capture speed, then the magnetic material content is increased, but residual magnetization occurs causing difficulty in redispersion
Solution Approach 1:
The invention changes the magnetic properties by using superparamagnetic nanoparticles with specific saturation magnetization values (0.3-1.0 emu/g). This parameter optimization allows high magnetic responsiveness for fast capture while maintaining zero residual magnetization, enabling easy redispersion after capture operations
Solution Approach 2:
The polymer shell acts as a protective layer that extracts or isolates the magnetic core from direct interaction with the external environment. This shell structure prevents aggregation and maintains zero residual magnetization, allowing the particle to be easily redispersed after magnetic field application
3Reliability
If the magnetic particle is used for capturing substances from specimen solution, then the capture function is achieved, but subsequent treatment becomes difficult due to residual magnetization
Solution Approach 1:
The superparamagnetic properties of the nanoparticles enable the particle to automatically respond to external magnetic fields for capture, but the zero residual magnetization ensures the particle does not retain magnetic memory, making subsequent washing and redispersion treatments simple and effective
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 magnetic particle efficiently captures substances from a specimen solution with a strong magnetic field and can be quickly redispersed, improving collection speed and reducing residual magnetization.
Implementation Method 1
The magnetic particle is used for a specimen test to be used in diagnosis. Specifically, there is given a method of detecting an antigen (antibody) from a specimen through use of a magnetic particle having an antibody (antigen), which specifically binds to the antigen (antibody)
Implementation Method 2
the polymer layer contains a polymer having at least one kind of functional group selected from the group consisting of: a carboxyl group; an amino group; a thiol group; an epoxy group; a maleimide group; and a succinimidyl group
Data Source
AI summary
Provided is a magnetic particle having high magnetic field responsiveness in detection of a substance to be measured, such as an antigen or an antibody, from a specimen. The magnetic particle includes a magnetic core particle and a polymer layer arranged on a surface of the magnetic core particle. The magnetic core particle contains an aggregation of a plurality of magnetic nanoparticles. The polymer layer contains a polymer having at least one kind of functional group selected from the group consisting of: a carboxyl group; an amino group; a thiol group; an epoxy group; a maleimide group; and a succinimidyl group.