Magnetic Microspheres with Partial Surface Coverage for Fluorescence
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Solution Overview
Problem
Current methods for producing fluorescent magnetic microspheres are limited by the sensitivity of fluorescent dye molecules to radical initiation polymerizations, leading to inactivation and the release of magnetic material during dyeing, which compromises the microspheres' fluorescent emission and magnetic properties.
Innovation Solution
A microsphere configuration with a core microsphere covered by a magnetic material and a polymer layer, where less than 50% of the surface is covered by magnetic material, ensuring strong association and preventing magnetic material loss, and a polymer layer formed in the absence of surfactants and stabilizers to enhance light transmission and bioassay performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If radical initiation polymerization is used to form the polymer matrix, then the polymerization process is effective and efficient, but the fluorescent dye molecules are inactivated and magnetic material is released
Solution Approach 1:
The fluorescent dye molecules are incorporated into the polymer matrix during the polymerization process rather than being added afterward. This preliminary incorporation protects the dye molecules from degradation by ensuring they are embedded within the matrix structure before any potential damaging interactions can occur, while still allowing the polymerization to proceed effectively
Solution Approach 2:
The polymer matrix acts as an intermediary that physically separates and protects the magnetic material from direct contact with the external environment. This intermediary structure prevents magnetic material release while maintaining the polymerization efficiency, as the matrix forms a stable encapsulation around the magnetic particles during and after the polymerization process
2Quantity of substance
If more magnetic material is added to increase magnetic content, then magnetic properties are enhanced, but light transmission is hindered
Solution Approach 1:
The magnetic material is distributed in a controlled manner within the polymer matrix, creating localized magnetic regions rather than uniform dense packing. This local distribution allows sufficient magnetic content for enhanced magnetic properties while maintaining light transmission pathways through the less dense polymer matrix regions
Solution Approach 2:
The invention uses a composite structure combining polymer matrix with magnetic material particles. This composite approach allows optimization of both magnetic properties and optical properties by adjusting the composition, particle size, and distribution of magnetic materials within the transparent polymer matrix, achieving enhanced magnetism without complete light blockage
3Reliability
If magnetic material is released during dyeing, then the microsphere structure is compromised, but magnetic properties are maintained
Solution Approach 1:
The polymer matrix is formed to encapsulate the magnetic material before any dyeing or processing steps occur. This preliminary encapsulation creates a stable protective structure that prevents magnetic material release during subsequent operations, maintaining both structural integrity and magnetic properties throughout the process
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 microspheres achieve high magnetic content without hindering light transmission, maintaining fluorescent emission and preventing magnetic material interaction with biomolecules, thus improving the accuracy and reliability of bioassays.
Implementation Method 1
The microspheres may have several configurations such as a magnetic core surrounded by a matrix; small magnetic particles dispersed throughout a matrix; and a magnetic coating on the outside of a spherical matrix
Implementation Method 2
a polymer layer surrounding the magnetic material and the core microsphere
Implementation Method 3
The use of fluorescent labels or fluorescent material coupled to a surface of the microspheres or incorporated into the microspheres allows preparation of numerous sets of microspheres that are distinguishable based on different dye emission spectra and/or signal intensity
Data Source
AI summary
Microspheres, populations of microspheres, and methods for forming microspheres are provided. One microsphere configured to exhibit fluorescent and magnetic properties includes a core microsphere and a magnetic material coupled to a surface of the core microsphere. About 50% or less of the surface of the core microsphere is covered by the magnetic material. The microsphere also includes a polymer layer surrounding the magnetic material and the core microsphere. One population of microspheres configured to exhibit fluorescent and magnetic properties includes two or more subsets of microspheres. The two or more subsets of microspheres are configured to exhibit different fluorescent and/or magnetic properties. Individual microspheres in the two or more subsets are configured as described above.