Micromagnet Array for Non-Linear Magnetophoretic Particle Separation
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Solution Overview
Problem
Current lab-on-a-chip systems face challenges with limited detection volume, resolution, and particle focusing, as well as issues with magnetic particle coagulation in linear magnetophoresis, which hinder efficient separation and detection of biological analytes.
Innovation Solution
An integrated optical detection system combined with a non-linear magnetophoretic separation system using a micromagnet array and a rotating magnetic field to manipulate and separate superparamagnetic micro-particles and attached biological materials, enhancing detection sensitivity and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If linear magnetophoresis is used to separate magnetic particles, then separation can be achieved, but magnetic particles coagulate to form undetectable complexes
Solution Approach 1:
The patent applies dynamic magnetic field modulation, switching between linear and non-linear magnetophoresis modes. During non-linear magnetophoresis, particles are immobilized individually on micromagnets preventing coagulation. During linear magnetophoresis, particles are transported for separation. This dynamic switching resolves the contradiction by preventing coagulation when particles are stationary while enabling separation when particles are in motion.
Solution Approach 2:
The system employs periodic alternation between non-linear and linear magnetophoresis modes. Non-linear magnetophoresis is applied periodically to re-immobilize particles and prevent coagulation, while linear magnetophoresis is applied periodically to transport and separate particles. This periodic action maintains particle dispersion throughout the separation process while achieving effective separation.
2Speed
If flow cytometry is used to detect particles, then detection speed is improved, but detection volume and resolution are limited
Solution Approach 1:
The system performs preliminary particle focusing using non-linear magnetophoresis before detection. Particles are immobilized in a focused array on micromagnets, concentrating them in a small detection volume. This preliminary focusing action enables high-resolution optical detection while maintaining fast detection speed, as all particles are pre-positioned in the detection field simultaneously.
Solution Approach 2:
The patent replaces the mechanical flow-based detection system of flow cytometry with a magnetic field-based particle manipulation and optical detection system. Instead of relying on fluid flow to pass particles through a detection point, the system uses magnetic fields to immobilize and focus particles, then uses optical methods to detect them in a stationary position, achieving both high speed and high resolution.
3Measurement precision
If magnetic particles are immobilized for detection, then detection sensitivity is improved, but particle transport and separation become difficult
Solution Approach 1:
The system dynamically switches between non-linear magnetophoresis mode for immobilizing particles during detection and linear magnetophoresis mode for transporting and separating particles. This dynamic switching resolves the contradiction by enabling particles to be immobilized when detection is required and transported when separation is required, without requiring separate systems.
Solution Approach 2:
The magnetic field system performs multiple functions: it can immobilize particles for high-sensitivity optical detection, transport particles for separation, and focus particles for concentration. This multi-functionality resolves the contradiction by showing that the same magnetic field system can achieve both immobilization for detection and transport for separation, depending on the mode of operation.
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 system achieves high sensitivity and efficient separation of biological analytes by controlling particle movement and focusing, overcoming limitations of previous technologies in detection volume and resolution.
Implementation Method 1
non-linear magnetophoretic separation system using a micromagnet array and a rotating magnetic field to manipulate and separate superparamagnetic micro-particles
Implementation Method 2
integrated optical detection system combined with a non-linear magnetophoretic separation system
Data Source
AI summary
There is provided system and a separation substrate device for use with an NLM separator in separating and/or detecting at least one target analyte in a sample, the substrate comprising a micromagnet array of a plurality of micromagnets, the micromagnet array comprising a first capture region, a second focusing region, and, a third detection region, the focusing region comprising a converging and/or diverging micromagnet array region. Also provided is a method for separating and detecting at least one target analyte in a sample. The method including: contacting a plurality of magnetic beads with a sample, the magnetic beads functionalized for binding with one or more target analytes in a sample to form aggregates; providing the sample including magnetic beads and aggregates to a separating substrate comprising a micromagnet array of a plurality of micromagnets; transporting the magnetic beads and aggregates relative to the micromagnet array to provide separation and enable detection of the magnetic beads and aggregates; detecting motion of the beads or aggregates of the sample on the array in response to the applied magnetic field and/or detecting beads or aggregates of the sample on the array at a detection region of the array.