Polymer Nanoswitches for Analyte Detection in Complex Matrices
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Solution Overview
Problem
Current methods for detecting analytes in complex samples, such as proteins in serum or urine, face challenges in sensitivity and specificity, particularly for low-abundance analytes, due to interference from high concentrations of non-analyte proteins and other components.
Innovation Solution
The use of polymer-based nanoswitches that change configuration upon analyte binding, allowing for separation via gel electrophoresis, where the presence of analytes is indicated by a topological change in the nanoswitch structure, enabling sensitive detection and quantification of analytes like proteins in complex matrices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional ELISA methods are used to detect analytes in complex samples, then the method is easy to use and low cost, but sensitivity and specificity are reduced due to interference from high concentrations of non-analyte proteins
Solution Approach 1:
The patent segments the detection process into two distinct phases: (1) a capture phase where a capture polymer binds to the analyte in the complex sample, and (2) a detection phase where a detection polymer binds to the capture polymer-analyte complex. This segmentation allows the system to distinguish the analyte from non-analyte proteins by requiring sequential binding events, thereby improving sensitivity while reducing interference.
Solution Approach 2:
The capture polymer acts as an intermediary molecule that first binds to the analyte and then serves as a binding site for the detection polymer. This intermediary mechanism allows the detection system to indirectly detect the analyte through the capture polymer, enabling sensitive detection even in the presence of high concentrations of non-analyte proteins that would otherwise interfere with direct detection methods.
2Measurement precision
If polymer-based nanoswitches with gel electrophoresis are used to detect analytes, then sensitivity and specificity are improved, but device complexity and cost increase
Solution Approach 1:
The patent employs polymers with multiple functional properties: they serve as both capture agents and detection agents, and their binding states can be detected through multiple readout mechanisms including gel electrophoresis, fluorescence, and color changes. This multi-functionality reduces the need for separate components and simplifies the overall assay system while maintaining high sensitivity.
Solution Approach 2:
The detection polymers are designed to undergo color changes or fluorescence emissions upon binding to the capture polymer-analyte complex. This optical readout mechanism provides a simple, visual, or measurable signal that indicates analyte presence without requiring complex instrumentation, thereby reducing device complexity while maintaining high detection sensitivity.
3Measurement precision
If conventional detection methods are used for low-abundance analytes, then the approach is simple, but accuracy is reduced due to interference from high concentrations of non-analyte components
Solution Approach 1:
The capture polymer performs a preliminary binding action to the analyte before the detection polymer binds. This preliminary capture step concentrates the low-abundance analyte and presents it to the detection polymer in a controlled manner, enabling accurate detection even when the analyte concentration is very low compared to the concentration of non-analyte components in the sample.
Solution Approach 2:
The patent replaces conventional mechanical or chemical detection methods with a polymer-based molecular recognition system that uses binding affinity and conformational changes. This substitution allows for highly specific interaction between the detection polymer and the capture polymer-analyte complex, enabling accurate detection of low-abundance analytes without being overwhelmed by the presence of high concentrations of non-analyte components.
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 achieves high sensitivity, allowing for the detection of low-abundance analytes with improved accuracy and reduced interference, enabling early detection of conditions such as pregnancy or infectious diseases at low costs and without the need for specialized equipment.
Implementation Method 1
the techniques described herein can be applied to any detection technique that involves (1) gel electrophoresis of large nucleic acids or polymers with modifications and (2) quantification of a band to determine the amount of material within a sample
Implementation Method 2
combining a sample with a first polymer and a second polymer, each conjugated, directly or indirectly, to an analyte-specific binding partner, under conditions that allow binding of analyte-specific binding partners to respective analytes
Data Source
AI summary
Provided herein, inter alia, are improved methods for detecting analytes, including proteins and nucleic acids. In some instances, the analytes are detected in complex matrices such as serum.