Magnetic Bead Array Assembly via Reversible Trapping
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Solution Overview
Problem
Current array technologies for genetic analysis are labor-intensive, time-consuming, and inflexible, requiring multiple fabrication steps and being poorly adaptable for changing probe sequences or adding new probes, with permanent binding to substrates limiting their reuse and flexibility.
Innovation Solution
The development of devices and methods for forming random arrays of magnetic particles using substrates with magnetic regions that produce localized magnetic fields, allowing for the reversible trapping and random ordering of magnetic beads, which can be encoded and used for analyzing samples and interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional ink-jet printing or photolithography methods are used to fabricate arrays, then probes can be permanently bound to substrate, but the process becomes labor-intensive, time-consuming, and inflexible for changing probe sequences
Solution Approach 1:
The patent applies the dynamics principle by replacing permanent covalent binding with reversible magnetic binding. The magnetic beads can be easily attached to and removed from the substrate by applying and removing magnetic fields, transforming a static permanent binding system into a dynamic reversible one. This enables flexible reconfiguration of probe arrays without requiring new fabrication processes.
Solution Approach 2:
The patent changes the binding mechanism parameter from chemical covalent bonds to magnetic forces. By using magnetic beads that respond to magnetic fields, the system allows for parameter-based control of binding strength through field intensity rather than requiring permanent chemical attachment, thus enabling easy reconfiguration and reuse.
2Manufacturing precision
If multiple fabrication steps are used to create arrays, then probes can be precisely positioned, but the process becomes labor-intensive and time-consuming
Solution Approach 1:
The patent replaces complex mechanical fabrication systems (ink-jet printing, photolithography, robotic positioning) with a magnetic field-based system. Magnetic beads are distributed in solution and positioned by magnetic fields, eliminating the need for complex mechanical deposition and positioning equipment, thereby simplifying the process and increasing throughput.
Solution Approach 2:
The magnetic beads self-assemble on the substrate through magnetic attraction without requiring external mechanical positioning systems. The beads automatically move to and bind at the desired locations guided by magnetic field gradients, eliminating labor-intensive manual or robotic placement steps.
3Stability of the object's composition
If probes are permanently bound to substrate, then array structure is stable, but reusability and adaptability are limited
Solution Approach 1:
The patent transforms the static permanent binding into a dynamic reversible binding system. Magnetic beads remain stably attached during assay operations but can be easily removed and reused by applying magnetic fields, extending the operational lifespan and reusability of the array compared to permanently bound probes that cannot be recovered.
4Loss of information
If traditional array methods are used, then probes can be positionally encoded, but the system lacks flexibility for adding new probes or changing sequences
Solution Approach 1:
The patent enables dynamic reconfiguration of the array by allowing magnetic beads to be added, removed, or relocated by applying magnetic fields. This provides flexibility to update probe sequences or add new probes without being constrained by fixed positional encoding, as the same physical location can be occupied by different beads depending on the magnetic field configuration.
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
This approach enables high-throughput, cost-effective, and flexible genetic analysis by simplifying fabrication, improving sensitivity and speed of assays, and allowing for easy reuse and reconfiguration of arrays, with enhanced sensitivity and signal-to-noise ratios.
Implementation Method 1
a substrate having a plurality of magnetic regions, wherein the magnetic regions produce a plurality of localized magnetic fields when magnetized
Implementation Method 2
the localized magnetic fields are sufficient to trap a magnetic particle with a trapping energy at least five times greater than the thermal energy of the particle at room temperature
Data Source
AI summary
The invention includes devices and methods for forming random arrays of magnetic particles, arrays formed using these devices and methods, and to methods of using the arrays. The invention provides an assembly (chip) with magnetic domains that produce localized magnetic fields capable of immobilizing magnetic particles such as commercially available magnetic beads. Probe or sensor molecules can be coupled to the beads, which are then dispersed on the assembly, forming a random order array. The arrays can be used for analyzing samples, targets, and/or the interaction between samples and targets. The invention finds particular use in processes such as high-throughput genotyping and other nucleic acid hybridization-based assays.