Molecular Probe Signal Amplification via Catalyst Mediators
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Solution Overview
Problem
Conventional immunoassays suffer from weak signal intensity and poor detection sensitivity and accuracy due to the inability to generate multiple measurable signals from a single target molecule interaction, leading to potential misdiagnosis and mistreatment.
Innovation Solution
A molecular probe is developed with a detector molecule linked to a catalyst that generates mediators capable of accumulating in a solution, participating in chemical reactions to produce amplified signals, including changes in optical, electromagnetic, thermodynamic, or mechanical properties, thereby enhancing detection sensitivity and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional immunoassays use a detection antibody linked to a detectable label, then the assay can detect the presence of the target molecule, but the signal intensity is weak and detection sensitivity is poor
Solution Approach 1:
The invention segments the detection system into multiple functional components: a detector molecule for target recognition, a catalyst for signal generation, and a mediator for signal amplification. This segmentation allows each component to perform its specific function efficiently, with the catalyst generating multiple mediators from a single target-binding event, thereby amplifying the signal without compromising detection sensitivity
Solution Approach 2:
The invention introduces a mediator as an intermediary substance that bridges the target molecule and the detectable signal. The mediator is generated by the catalyst in response to target binding and accumulates in the solution to produce an amplified measurable signal. This intermediary mechanism enables one target molecule to generate multiple signal carriers, significantly improving both signal intensity and detection sensitivity
2Reliability
If one horseradish peroxidase reacts with one luminol molecule to generate one photon, then the reaction is simple and specific, but the signal fades away immediately after generation resulting in weak signal intensity
Solution Approach 1:
The invention changes the fundamental parameters of the signal generation process by replacing the direct one-to-one enzyme-substrate reaction with a catalytic system that generates multiple stable mediator molecules. The catalyst continuously produces mediators that accumulate in the solution, transforming the transient single-photon signal into a sustained amplified signal, thereby improving both signal stability and detection accuracy
Solution Approach 2:
The invention establishes continuity of useful action through the catalyst-mediated generation of mediators. Instead of a single instantaneous reaction, the catalyst continuously generates mediators that accumulate over time, maintaining a sustained signal level. This continuous action ensures the signal remains detectable and stable throughout the measurement period, improving both reliability and accuracy
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 molecular probe achieves significant signal amplification, allowing for 'one-to-many' signal generation, improving detection sensitivity and accuracy while providing the possibility of double-checking detected signals, thus reducing the risk of misdiagnosis.
Implementation Method 1
The label includes a catalyst for generating electrons and/or mediators from a solution
Data Source
AI summary
A molecular probe includes a detector molecule specific to a target molecule, and at least one label linked covalently or non-covalently to the detector molecule. The label includes a catalyst for generating electrons and/or mediators from a solution. The catalyst includes a nanomaterial, an enzyme, a metal, and/or a metal complex. The mediators can accumulate in the solution for a period of time. The detector molecule and the target molecule interact with each other by a protein based or nucleotide sequence based interaction. The mediators participate in a chemical reaction that generates a signal that may be a change in optical, electromagnetic, thermodynamic or mechanical properties. Generation efficiency of the mediators is enhanced by providing an energy to the solution. The molecular probe may be used with a molecular detection assay performed on a surface. A method for assaying the target molecule using the molecular probe is also provided.