Magnetic Nanoparticle Analyte Detection via Sensor-Release Motion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for detecting analytes using magnetisable particles face challenges such as complex configurations unsuitable for miniaturization, high particle concentrations leading to non-specific interactions, reduced binding rates, and false positive signals due to non-specific binding, limiting sensitivity and precision in point-of-care testing.
Innovation Solution
A method involving magnetisable particles coated with binding molecules is used, where the particles are positioned near a magnetic field sensor, and the magnetic field is changed to release bound and unbound complexes, allowing detection based on the net movement of particles relative to the sensor, enabling rapid and sensitive analyte detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetisable particles are used for analyte detection, then sensitivity and detection capability are improved, but device complexity increases and miniaturization becomes difficult
Solution Approach 1:
The patent combines the magnetisable particles, binding molecules, and magnetic field sensor into an integrated detection system. The functionalisation of particles with binding molecules (antibodies, aptamers, or nucleic acids) allows direct detection of target analytes without complex separation or washing steps, thereby improving sensitivity while reducing device complexity and enabling miniaturization for point-of-care testing.
2Productivity
If high concentration of magnetisable particles is used, then analyte capture rate is improved, but non-specific interactions and false positive signals increase
Solution Approach 1:
The patent optimizes the concentration of magnetisable particles to achieve the best balance between analyte capture rate and detection accuracy. By carefully controlling particle concentration and using specific binding molecules with high affinity and selectivity for the target analyte, the system maximizes productive binding while minimizing non-specific interactions, thereby maintaining both high productivity and reliability in analyte detection.
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 method achieves rapid detection within 10-20 seconds with a limit of detection (LOD) of 0.05 pg/mL and limit of quantification (LOQ) of 0.1 pg/mL, providing a highly sensitive and miniaturized solution for analyte detection.
Implementation Method 1
positioning the magnetisable particles, comprising both bound and unbound binder complexes, in proximity to a magnetic field sensor
Implementation Method 2
changing the magnetic field sufficient to release at least a portion of the magnetisable particles from their proximity to the magnetic field sensor
Implementation Method 3
the particles being coated with binding molecules complementary to the target analyte, resulting in bound and unbound binder complexes
Data Source
AI summary
Described is a method and device for detecting an analyte in a sample, comprising bringing a sample comprising a target analyte into contact with magnetisable particles, the particles being coated with binding molecules complementary to the target analyte, resulting in bound and unbound binder complexes, positioning the magnetisable particles, comprising both bound and unbound binder complexes, in proximity to a magnetic field sensor, changing the magnetic field sufficient to release at least a portion of the magnetisable particles, comprising both bound and unbound binder complexes, from their proximity to the magnetic field sensor, and measuring changes in a magnetic signal detected from the net movement, being either translational or rotational movement, of the magnetisable particles relative to the magnetic sensor.