TEA ECL Assay Composition for Non-Wash Signal Discrimination
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Solution Overview
Problem
Existing ECL-based assays on solid surfaces require a wash step to differentiate between surface-bound and free ECL labels, which can be cumbersome and lead to high background signals, especially in low-affinity interactions.
Innovation Solution
Compositions comprising triethanolamine (TEA) and an ionic component, optionally with a surfactant, at a pH of 7.0 to 8.0, effectively discriminate between bound and free ECL labels, allowing for non-wash assay formats and maintaining consistent ECL generation across different surfactant conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a wash step is used to differentiate between surface-bound and free ECL labels, then measurement precision is improved, but device complexity and loss of time increase
Solution Approach 1:
The invention changes the chemical parameter of the ECL coreactant from conventional options (like tripropylamine) to triethanolamine (TEA) combined with specific ionic components. This parameter change enables the composition to selectively quench free ECL labels while allowing surface-bound labels to generate signal, thereby achieving differentiation without requiring a wash step. The specific pH range (7.0-8.0) and ionic strength are critical parameters that enable this selective discrimination.
Solution Approach 2:
The TEA-based composition acts as an intermediary medium that facilitates differentiation between bound and free ECL labels. Rather than physically separating them through washing, the composition chemically mediates the distinction by selectively suppressing signal from free labels while permitting signal from surface-bound labels. This intermediary approach simplifies the assay procedure by eliminating the need for complex wash steps.
2Measurement precision
If a wash step is performed to reduce background signals, then measurement precision is improved, but loss of time and ease of operation worsen
Solution Approach 1:
The invention extracts or removes the wash step from the assay procedure by using the TEA-based composition to achieve background suppression in place. Instead of physically removing free ECL labels through washing, the composition chemically extracts the background signal by selectively quenching free labels. This extraction approach maintains high signal-to-background ratios while eliminating the time-consuming wash step.
Solution Approach 2:
By changing the coreactant parameters to TEA with specific ionic components at controlled pH and ionic strength, the invention enables background suppression without time loss. The parameter changes allow the system to achieve what previously required a wash step, thereby reducing assay duration while maintaining measurement precision.
3Ease of operation
If conventional ECL coreactants are used, then ease of operation is maintained, but measurement precision worsens due to high background signals
Solution Approach 1:
The invention changes the chemical parameters of the ECL coreactant system by using TEA instead of conventional coreactants like tripropylamine. This parameter change fundamentally alters the signal generation characteristics, enabling selective quenching of free labels while maintaining simplicity of operation. The new parameter regime (TEA + ionic component at pH 7.0-8.0) inherently provides background suppression without complicating the assay procedure.
Solution Approach 2:
The invention uses a composite ECL composition comprising TEA combined with specific ionic components. This composite material provides synergistic effects where the combination of TEA and ionic components creates selective quenching behavior that neither component achieves alone. The composite nature of the composition enables both ease of operation and improved measurement precision simultaneously.
4Productivity
If non-wash assay format is used, then productivity is improved, but measurement precision worsens without proper discrimination capability
Solution Approach 1:
The invention enables non-wash assay format by changing the coreactant parameters to TEA-based composition. This parameter change provides inherent discrimination capability between bound and free labels through selective quenching, allowing the assay to proceed without wash steps while maintaining measurement precision. The productivity improvement comes from eliminating the wash step, while precision is maintained through the chemical discrimination mechanism.
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 TEA-based compositions enhance assay performance by increasing the ratio of bound to free ECL signal, reducing the need for wash steps and maintaining ECL generation consistency, particularly in assays with sensitive analytes and harsh surfactants.
Implementation Method 1
Compositions comprising an electrochemiluminescence (ECL) co-reactant... Compounds that interact with the ECL label and generate ECL are referred to as ECL coreactants
Data Source
AI summary
The invention relates to novel compositions comprising an electrochemiluminescence (ECL) co-reactant. In embodiments, the composition further comprises an ionic component, a surfactant, or combination thereof. In embodiments, the ECL co-reactant is triethanolamine (TEA), tert-butyldiethanolamine (tBDEA), methyldiethanolamine (MDEA), 3-[Bis-(2-hydroxy-ethyl)-amino]-propane-1-sulfonic acid (DEA-PS), or a combination thereof. Methods of using the compositions and kits comprising the compositions are also provided herein.