Target Analyte Detection Using Tethered Probes to Cut Background Noise
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Solution Overview
Problem
Existing detection systems struggle to accurately detect low concentrations of target analytes in samples due to non-specific binding, leading to high background noise and difficulty in distinguishing specific from non-specific interactions.
Innovation Solution
A method involving a complex formed by a target analyte and two probes, where a detectable piece is coupled to a solid support through an elongated region, allowing for the application of a force or exposure to a disruptor to differentiate between specific and non-specific binding by measuring displacement or Brownian motion of the detectable piece.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reporter markers are used to increase signal from bound target analytes, then detection sensitivity is improved, but background noise from non-specific binding increases
Solution Approach 1:
The patent introduces an elongated molecule as an intermediary between the solid support and the detectable piece. This intermediary creates a physical tether that allows discrimination: specifically bound detectable pieces remain tethered to the solid support, while non-specifically bound pieces are free to move. This resolves the contradiction by maintaining signal from specific binding while eliminating background noise from non-specific binding through spatial separation.
Solution Approach 2:
The system segments the binding interaction into two distinct components: the specific binding event (target analyte binding to probe) and the non-specific binding event (detectable piece adhering to solid support). By requiring both specific binding and elongated molecule tethering for signal retention, the system separates true signal from background noise, improving detection precision while reducing false positives.
2Object-generated harmful factors
If force is applied to remove non-specifically bound particles, then background noise is reduced, but specifically bound particles may be dislodged
Solution Approach 1:
The elongated molecule acts as a pre-established cushion or buffer between the solid support and the detectable piece. This cushion absorbs the mechanical stress of applied force, protecting specifically bound particles from being dislodged while still allowing non-specifically bound particles to be removed. The tether provides a safety margin that maintains specific binding integrity during the noise-reduction process.
3Measurement precision
If detectable pieces are tethered via elongated molecules, then specific binding can be distinguished from non-specific binding, but device complexity increases
Solution Approach 1:
The elongated molecule serves as a simple intermediary component that adds minimal structural complexity while providing substantial functional benefit. Rather than complex detection systems, a single elongated tether molecule distinguishes specific from non-specific binding through its physical presence, maintaining measurement precision while avoiding excessive device complexity.
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
Enables the detection of low concentrations of target analytes while effectively distinguishing between specific and non-specific binding, reducing background noise and improving detection accuracy.
Implementation Method 1
measuring the amount of Brownian motion of the detectable piece
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 first probe is coupled to a detectable piece, the target is coupled to the first probe and the second probe, and the second probe is coupled to a solid support. Specific binding of the detectable piece to the target analyte can be distinguished from non-specific binding of the detectable piece by measuring the number of detectable pieces that leave their initial location after exposure to a disruptor that uncouples the detectable piece from the solid support.