Magneto-Optical Analyte Detection Using Modulated Magnetic Fields
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Solution Overview
Problem
Current bio-sensing methods, such as the limulus amoebocyte lysate (LAL) assay, face challenges in detecting analytes at low concentrations with minimal reagent volume and high sensitivity, particularly in detecting endotoxins, which require improved detection methods to ensure accuracy and speed while minimizing the use of horseshoe crab-derived reagents.
Innovation Solution
A method involving a liquid detection medium with anisotropic magnetic particles and a modulated magnetic field, combined with electromagnetic radiation, to detect changes in the state of the liquid, such as viscosity, which correlates with the presence of analytes, allowing for sensitive and accurate detection of analytes like endotoxins using low volumes of reagents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the LAL assay is used to detect endotoxin, then the detection can be performed with high sensitivity, but large volumes of horseshoe crab-derived reagents are required
Solution Approach 1:
The patent replaces the conventional optical detection system with a magneto-optical system that uses magnetic fields to manipulate anisotropic particles. This substitution enables detection in low-viscosity environments with minimal reagent volumes while maintaining high sensitivity, directly resolving the contradiction between detection sensitivity and reagent volume requirements
Solution Approach 2:
The invention changes the detection parameter from optical properties alone to magneto-optical properties. By applying modulated magnetic fields and detecting the response of anisotropic particles, the system achieves high sensitivity detection with significantly reduced reagent volumes, addressing both the sensitivity and reagent volume concerns
2Quantity of substance
If the LAL assay is performed with minimal reagent volume, then ethical and economical concerns are addressed, but the detection accuracy and reliability may be compromised
Solution Approach 1:
The magneto-optical detection system replaces conventional optical methods, enabling reliable and accurate measurements even at low concentrations and minimal reagent volumes. The magnetic field manipulation of anisotropic particles provides a robust detection mechanism that maintains reliability regardless of reagent volume
Solution Approach 2:
The patent uses anisotropic particles that replicate the detection function in a simplified system. These particles respond to magnetic fields in a manner that copies the sensitivity of biological assays while requiring minimal reagent volumes, ensuring both ethical/economical benefits and detection reliability
3Device complexity
If conventional optical detection methods are used, then the detection system is simple, but the detection sensitivity at low analyte concentrations is insufficient
Solution Approach 1:
The patent substitutes optical detection with magneto-optical detection, adding magnetic field generation capabilities. This substitution significantly enhances detection sensitivity at low analyte concentrations while maintaining reasonable system complexity through the use of modulated magnetic fields and anisotropic particle response
Solution Approach 2:
The invention employs modulated magnetic fields that vary periodically in time. This periodic action enhances the detection signal by creating time-dependent magnetic moments in the anisotropic particles, allowing sensitive detection of low analyte concentrations through lock-in amplification techniques while keeping the system relatively simple
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 the detection of analytes at very low concentrations, including endotoxins, with enhanced sensitivity and speed, reducing the need for large volumes of horseshoe crab-derived reagents and improving the reliability of bio-sensing applications.
Implementation Method 1
applying a modulated magnetic field across at least a portion of the liquid detection medium, wherein the magnetic field induces an alignment of the magnetic particles; introducing electromagnetic radiation into the liquid detection medium; detecting a variable which is modulated by the applied magnetic field, wherein the variable is associated with the interaction of the electromagnetic radiation with the magnetic particles
Data Source
AI summary
There is provided a method of detecting a change of a state of a liquid comprising the steps of: •providing a liquid detection medium (12) comprising a liquid and having a plurality of anisotropic magnetic particles suspended therein; •applying a modulated magnetic field across at least a portion of the liquid detection medium (12), wherein the magnetic field induces an alignment of the magnetic particles; •introducing electromagnetic radiation (22) into the liquid detection medium (12); •detecting a variable which is modulated by the applied magnetic field, wherein the variable is associated with the interaction of the electromagnetic radiation (22) with the magnetic particles and wherein the change in the state of the liquid causes a variation in the detected variable; and •correlating the variation in the detected variable with the change in the state of the liquid.