ECL-Labeled Immunoassay Probes for Low-Concentration Analyte Detection
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Solution Overview
Problem
Conventional immunoassay techniques struggle with low sensitivity and specificity due to non-specific binding and instability of sandwich complexes, particularly for analytes at low concentrations, leading to complex and labor-intensive protocols that compromise assay performance.
Innovation Solution
A method involving the use of capture and detection reagents linked to nucleic acid probes, forming a complex on a surface, extending the probe to form an anchoring region, and measuring the bound sequence, which includes electrochemiluminescence for signal amplification, to enhance sensitivity and specificity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sandwich immunoassay techniques are used, then the assay can detect analytes with good sensitivity and specificity, but the detection limit is insufficient for very low concentration analytes and the protocol becomes complex and labor-intensive
Solution Approach 1:
The patent combines the capture antibody and detection antibody into a single biotinylated sandwich complex that can be prepared in advance. This pre-formed complex merges multiple binding steps into one addition step during assay execution, dramatically simplifying the protocol while maintaining detection sensitivity for low concentration analytes
Solution Approach 2:
The sandwich complex is prepared in advance by incubating the capture antibody, analyte, and detection antibody together, then biotinylating the complex before storage. This preliminary preparation eliminates the need for multiple sequential binding steps during actual assay execution, reducing complexity while preserving detection capability
2Reliability
If conventional sandwich immunoassay techniques are used, then the assay can be performed with standard reagents, but the sandwich complexes exhibit instability and high off-rate antibodies limit performance
Solution Approach 1:
The patent creates a composite sandwich complex structure where the capture antibody, analyte, detection antibody, and biotin are assembled into a stable pre-formed complex. This composite structure enhances stability by pre-organizing all components in their functional configuration, preventing dissociation that occurs with conventional stepwise approaches
Solution Approach 2:
The patent changes the chemical state of the sandwich complex by introducing biotinylation. This chemical modification adds biotin groups to the complex, enabling high-affinity streptavidin binding that stabilizes the complex and prevents off-rate issues inherent in conventional antibody-antigen interactions
3Measurement precision
If conventional immunoassay techniques are used, then the assay can be performed without signal amplification, but non-specific binding reduces specificity and detection of low concentration analytes is compromised
Solution Approach 1:
The patent introduces biotin as an intermediary molecule that bridges the sandwich complex and streptavidin-based detection systems. This intermediary enables high-affinity binding and signal amplification through streptavidin-biotin interactions, significantly enhancing signal intensity while the specific biotinylated complex formation maintains assay specificity by reducing non-specific binding
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 method significantly enhances the sensitivity and specificity of immunoassays by stabilizing the complex and providing efficient signal amplification, allowing for accurate detection of low-concentration analytes.
Implementation Method 1
The detectable label is an ECL label and the measuring step can include measuring an ECL signal
Data Source
AI summary
The present invention is directed to assay methods and compounds and kits used in such assays.