Force-Induced Magnetization Contrast for Molecular Detection
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Solution Overview
Problem
Current methods for diagnosing diseases using magnetic entities face challenges in distinguishing specific binding signals from background noise, leading to inefficiencies and increased costs, particularly due to the need for physical separation and limitations in sensitivity and selectivity.
Innovation Solution
The method involves conjugating magnetic particles with ligands to target molecules, applying external forces to induce magnetization changes, and analyzing these changes using force-induced magnetization contrast to differentiate between bound and unbound particles, allowing for selective measurement and identification of multiple target molecules without separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If physical separation techniques are used to isolate bound magnetic entities from free magnetic entities, then the distinction between specific binding signal and background signal is improved, but the procedure becomes highly undesirable due to excessive toxicity and increased cost
Solution Approach 1:
The patent extracts the background signal contribution from the total measured signal by applying a mathematical subtraction process. The measured signal consists of bound magnetic entities plus free magnetic entities. By measuring the signal from free magnetic entities separately (control measurement) and subtracting it from the total signal, the contribution from specifically bound magnetic entities is isolated without requiring physical separation techniques.
Solution Approach 2:
The patent introduces a control measurement as an intermediary step. This control measurement captures the background signal from free magnetic entities, which then serves as a reference for subtracting the background contribution from the total signal. This intermediary measurement enables the isolation of specific binding signals without physical separation.
2Ease of operation
If conventional magnetization measurement methods are used without separation techniques, then the procedure remains simple, but the background signal from free particles results in lower sensitivity and selectivity
Solution Approach 1:
The patent implements a feedback mechanism where the control measurement (background signal) is used to correct the total signal measurement. By measuring the free particle signal first and then using this information to subtract the background contribution from the total signal, the method continuously refines the measurement accuracy without complicating the overall procedure.
Solution Approach 2:
The patent replaces the mechanical/physical separation system with a mathematical signal processing system. Instead of using physical techniques to separate bound from free magnetic entities, the invention uses signal subtraction based on magnetization measurements, transforming a physical separation problem into a mathematical analysis problem.
3Ease of operation
If magnetic particle relaxation contrast is used to distinguish bound from free particles, then the measurement can be performed without separation, but the difference in relaxation time is small and the time window for measurement is narrow
Solution Approach 1:
The patent changes the measurement parameter from relaxation time differences to total magnetization signal differences. By measuring the overall magnetization signal rather than relying on subtle relaxation time variations, the method extends the measurement time window and improves sensitivity while maintaining the advantage of not requiring physical separation.
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 sensitive, selective, and cost-effective detection of target molecules, reducing background interference and enabling simultaneous measurement of multiple types, making it more efficient than conventional methods.
Implementation Method 1
magnetic entities, most often as particles and in other forms such as rods and shells, are widely used in medical diagnosis and imaging
Implementation Method 2
measuring a first magnetization of the mixture; subjecting the mixture to a first force; measuring a second magnetization value of the mixture; subtracting the second magnetization value from the first magnetization value to calculate a first force-induced magnetization contrast
Data Source
AI summary
A method of detecting target molecules comprising; conjugating a first magnetic particle to a first ligand to form a first magnetic particle ligand conjugate; adding the conjugate to a sample containing target molecules to form a mixture comprising, the free conjugate and conjugate-target molecule binding pairs; measuring a first magnetization of the mixture; subjecting the mixture to a first force; measuring a second magnetization value of the mixture; subtracting the second magnetization value from the first magnetization value to calculate a first force-induced magnetization contrast; subjecting the mixture to a second force; measuring a third magnetization of the mixture; and subtracting the third magnetization value from the second magnetization value to calculate a second force-induced magnetization contrast.