Particle Displacement Detection for Analyte Specificity
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Solution Overview
Problem
Existing detection systems struggle to accurately detect low concentrations of target analytes due to limitations in distinguishing specific from non-specific binding, leading to increased background noise and reduced signal clarity.
Innovation Solution
A method involving a complex formed by a first probe coupled to a particle and a second probe coupled to a solid support, both bound to the target analyte if present, allowing for the application of a force to measure particle displacement or Brownian motion to indicate the presence of the target analyte.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reporter markers are used to increase signal, then signal strength is improved, but background noise increases due to non-specific binding
Solution Approach 1:
The detection system is segmented into multiple functional components: capture probes on the solid support, detection probes coupled to reporter markers, and the target analyte. This segmentation allows specific binding events to be distinguished from non-specific binding, as specifically bound reporter markers are positioned at a defined distance from the solid support surface, while non-specifically bound markers remain close to the surface.
Solution Approach 2:
The patent introduces an intermediary measurement approach by measuring the distance between the reporter marker and the solid support surface. This distance measurement acts as an intermediary that distinguishes specifically bound markers (at a characteristic distance) from non-specifically bound markers (close to the surface), thereby reducing background noise while maintaining signal strength.
2Measurement precision
If detection sensitivity is increased to detect low concentration analytes, then detection capability is improved, but ability to distinguish specific from non-specific binding deteriorates
Solution Approach 1:
The patent adds a spatial dimension to the detection by measuring the distance between the reporter marker and the solid support surface. This dimensional information allows the system to distinguish specifically bound analytes (where the marker is at a characteristic distance) from non-specifically bound markers (close to the surface), thereby maintaining high detection sensitivity while preserving specificity.
3Ease of operation
If known detection systems are used, then detection capability is provided, but ability to detect low concentration target analytes is limited
Solution Approach 1:
The patent replaces traditional signal intensity-based detection with a spatial positioning-based detection system. Instead of relying solely on the intensity of the signal from reporter markers, the system measures the position/distance of the markers relative to the solid support surface, providing enhanced detection capability for low concentration analytes while maintaining ease 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
This approach effectively distinguishes specific from non-specific binding, enhances signal clarity, and allows for the detection of low concentrations of target analytes with improved accuracy.
Implementation Method 1
measuring the Brownian motion of the indirectly coupled particle, wherein the amount of Brownian motion indicates whether or not the target analyte is present in the sample
Data Source
AI summary
The present application relates to detection units and methods for detecting one or more target analytes in a sample using a complex formed by a target and first and second probes, wherein the complex comprises an elongated region, a particle that is coupled to the first probe, and a solid support that is coupled to the second probe. Specific binding of a target analyte can be distinguished from non-specific binding of the particle by measuring the displacement of the particle.