Silane-Glass Encapsulated Nanomagnetic Particles for Aggregation Control
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Solution Overview
Problem
Existing magnetic particle technologies for biomolecule separation result in particles larger than 0.3 um, leading to aggregation and difficulty in controlling particle size and shape, which affects their effectiveness in complex biological samples.
Innovation Solution
A multi-layered nanomagnetic particle process involving a silane-glass encapsulation with a stabilizing protein/polymer composite, allowing for nanomagnetic particles of 5 nm to 500 nm diameter, specifically coated with targeting moieties for biomolecules, maintaining stability under strong magnetic fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods are used to prepare magnetic particles, then particles can be produced for biomolecule separation, but particle size becomes larger than 0.3 um leading to aggregation and difficulty in controlling particle size and shape
Solution Approach 1:
The magnetic particle is segmented into multiple functional layers: a core magnetic particle, a silane coating layer, and a protein/polymer composite layer. This segmentation allows each layer to be optimized independently, with the core providing magnetic properties and the outer layers controlling size, shape, and stability, thereby preventing aggregation and improving manufacturing precision.
Solution Approach 2:
The patent uses composite materials by combining magnetic particles with silane coatings and protein/polymer composites. The silane coating acts as a transition layer between the magnetic core and the protein/polymer composite, creating a composite structure that controls particle size and prevents aggregation while maintaining magnetic separation functionality.
2Productivity
If magnetic particles are made smaller to improve separation efficiency, then particle aggregation increases and stability decreases
Solution Approach 1:
The patent applies a nested structure where the silane coating is applied first as an inner layer, followed by the protein/polymer composite layer as an outer layer. This nested arrangement provides multiple levels of protection: the silane layer prevents direct contact between the magnetic core and the environment, while the protein/polymer composite layer provides additional stabilization and targeting functionality, maintaining particle stability even at nanometer scales.
Solution Approach 2:
The silane coating acts as an intermediary layer between the magnetic particle core and the protein/polymer composite. This intermediary layer facilitates the transition from the magnetic core to the functional outer layer, providing a stable interface that prevents aggregation and maintains particle integrity while allowing the particle to be made small enough for high separation efficiency.
3Measurement precision
If particles are coated with targeting moieties for specific biomolecule separation, then separation specificity improves, but particle size control becomes more difficult
Solution Approach 1:
The silane coating is applied as a preliminary action before the protein/polymer composite layer is added. This preliminary silane coating establishes a controlled surface that will subsequently bind the protein/polymer composite and targeting moieties. By preparing the surface with silane first, the particle size and structure are controlled before the functional targeting components are added, ensuring that the final particle maintains precise size control while gaining specific separation capabilities.
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 nanomagnetic particles exhibit narrow size distribution, stability under strong magnetic fields, and maintain targeting properties over extended storage, enabling efficient separation of biomolecules and cells from complex mixtures.
Implementation Method 1
a silane-glass encapsulation with a stabilizing protein/polymer composite
Implementation Method 2
silane-glass encapsulation
Implementation Method 3
maintaining stability under strong magnetic fields
Implementation Method 4
nanomagnetic particles
Implementation Method 5
specifically coated with targeting moieties for biomolecules
Data Source
AI summary
Processes and compositions are described for preparing new, colloidally stable, coated nanomagnetic particles useful for both in-vitro and in-vivo biomedical applications, including cell targeting and capturing cells, microorganisms, and cellular organelles or entities such as exosomes. These nanomagnetic particles can also be used as imaging contrast agents due to their small size and high magnetic moment. The nanomagnetic particles include a series of sequentially added, stabilizing surface coatings rendered onto nano-sized magnetic crystal clusters (e.g., magnetite particles) to impart colloidal stability in complex biological samples with minimal leaching of the coating materials, high binding capacity, and low non-specific binding. Another benefit of this invention is the ability to utilize both external and internal magnetic field-generating separation devices to effect separation of the magnetic nanoparticles.