Dual Ligand Analyte Detection Reducing Non-Specific Binding
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Solution Overview
Problem
Existing methods for detecting analyte molecules in fluid samples are hindered by non-specific binding, leading to increased background signals and reduced accuracy, especially when dealing with low concentrations.
Innovation Solution
The use of dual detection methods involving two types of binding ligands that specifically bind to different epitopes of the analyte molecules, spatially segregating them into locations where only analyte molecules with both ligands are counted, thereby reducing false positives and enhancing detection sensitivity and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If single detection method using one binding ligand is used, then device complexity is low, but measurement precision deteriorates due to non-specific binding
Solution Approach 1:
The detection method is segmented into two independent binding events: first binding ligand attaches to first epitope, second binding ligand attaches to second epitope. This segmentation allows verification of specific binding through coincidence detection, reducing non-specific binding effects while maintaining manageable complexity through modular assay design.
Solution Approach 2:
The analyte molecule serves as an intermediary that brings two separately applied binding ligands into proximity. By requiring both ligands to bind to the same analyte molecule, the system verifies specific binding without requiring direct interaction between the ligands, thereby reducing non-specific binding while keeping the detection mechanism relatively simple.
2Measurement precision
If dual detection methods with two binding ligands are used, then measurement precision improves by reducing non-specific binding, but device complexity increases
Solution Approach 1:
The dual detection method is segmented into distinct steps: application of first binding ligand, application of second binding ligand, and coincidence detection. This segmentation improves precision by verifying specific binding while managing complexity through a systematic, stepwise protocol that can be implemented with standard laboratory equipment.
Solution Approach 2:
The method applies local quality by requiring binding at specific epitopes on the analyte molecule. By targeting specific local regions (epitopes) rather than general binding, the system achieves higher specificity and precision while the complexity is localized to the selection of epitope-specific ligands rather than the entire detection system.
3Measurement precision
If spatial segregation into multiple locations is implemented, then measurement precision improves through reduced background signal, but device complexity increases
Solution Approach 1:
The assay is segmented into multiple spatial locations or reaction vessels, with each location serving as an independent detection unit. This segmentation reduces background signal by distributing the analyte across many locations, allowing statistical analysis of positive signals while keeping each individual location simple and manageable.
Solution Approach 2:
The detection approach transitions from a single bulk measurement to a multi-dimensional array of discrete locations. By adding the spatial dimension to the assay, the system achieves better signal-to-background ratios through distributed measurement while maintaining simplicity at each individual measurement point.
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 allows for more accurate and sensitive detection of analyte molecules at lower concentrations by minimizing non-specific binding effects, enabling the quantification of previously undetectable samples and improving the reliability of concentration measurements.
Implementation Method 1
providing the analyte molecules immobilized with respect to a binding surface having affinity for at least one type of analyte molecule
Implementation Method 2
exposing the analyte molecules or particles to a first type of binding ligand having an affinity for a first epitope on the analyte molecules or particles and a second type of binding ligand having an affinity for a second epitope on the analyte molecules or particles
Data Source
AI summary
Described herein are systems and methods for the detection of and/or determination of a measure of the concentration of analyte molecules or particles in a fluid sample. In some cases, the systems and methods employ techniques to reduce or limit the negative effects associated with non-specific binding events. Certain methods of the present invention involve associating the analyte molecules at least a first type of binding ligand and at least a second type of binding ligand, and spatially segregating the analyte molecules into a plurality of locations on a surface. The presence of an analyte molecule at or in a location may be determined by determining the presence of both the first type of binding ligand and the second type of binding ligand.