Background Blocking Reagents for Time-Resolved Fluorometry Assays
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Solution Overview
Problem
Time-resolved fluorometry binding assays using lanthanide chelates face challenges with non-specific background luminescence and reduced assay sensitivity due to hydrophobic aromatic chromophores, which decrease water solubility and increase non-specific binding, leading to purification issues and reduced yield.
Innovation Solution
The use of background blocking reagents with similar chromophoric chelating ligand structures but without the fluorescent lanthanide ion, such as Gd3+ instead of Eu3+, or chelating ligands without a lanthanide ion, to prevent non-specific binding and reduce background luminescence, while maintaining high water solubility and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If lanthanide chelates with multiple hydrophobic aromatic chromophores are used to improve luminescence intensity, then luminescence intensity is improved, but water solubility decreases and non-specific binding increases
Solution Approach 1:
The patent introduces a background blocking reagent as an intermediary substance that mediates between the hydrophobic chromophores and the aqueous environment. This blocking reagent contains hydrophilic groups that interact with the hydrophobic chromophores, preventing aggregation and maintaining solubility while allowing the chromophores to maintain their luminescence properties.
Solution Approach 2:
The patent modifies the chemical parameters of the chelate system by introducing background blocking reagents with specific hydrophilic groups (such as carboxyl, hydroxyl, or amino groups). These parameter changes alter the overall hydrophilicity of the system, enabling multiple chromophores to remain soluble in aqueous solutions without sacrificing luminescence intensity.
2Illumination intensity
If multiple hydrophobic aromatic chromophores are used to enhance luminescence, then luminescence intensity is improved, but non-specific binding increases leading to background luminescence
Solution Approach 1:
The patent converts the harmful hydrophobic interactions that cause non-specific binding into a beneficial effect by introducing background blocking reagents. These reagents contain hydrophilic groups that preferentially interact with the hydrophobic chromophores, preventing them from binding non-specifically to biomolecules while allowing specific binding to occur. The hydrophobic character is thus transformed from a source of interference into a controlled interaction.
Solution Approach 2:
The background blocking reagent acts as an intermediary that selectively interacts with the hydrophobic chromophores, preventing their non-specific binding to biomolecules. The reagent contains functional groups that compete with biomolecule binding sites, thereby reducing background luminescence while preserving specific signal detection.
3Measurement precision
If background blocking reagents are added to reduce non-specific binding, then background luminescence is reduced, but assay complexity increases
Solution Approach 1:
The background blocking reagent is designed to perform multiple functions simultaneously: it blocks non-specific binding sites, maintains chromophore solubility, and does not interfere with specific binding interactions. This multi-functionality reduces the need for additional separate reagents or steps, thereby limiting the increase in assay complexity while achieving background reduction.
Solution Approach 2:
The patent optimizes the concentration and chemical properties of the background blocking reagent to achieve effective background reduction at minimal concentrations. By carefully adjusting parameters such as reagent concentration, molecular weight, and functional group composition, the assay complexity is minimized while maintaining high sensitivity.
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
Significantly reduces non-specific background luminescence and enhances assay sensitivity by preventing non-specific binding of labeled biomolecules, allowing for improved detection of specific analytes in bio-affinity assays.
Implementation Method 1
Time-resolved fluorometry (TRF), employing long-lifetime emitting luminescent lanthanide chelates
Implementation Method 2
long-lifetime emitting luminescent lanthanide chelates
Implementation Method 3
non-specific binding properties of labeled molecules will enhance background luminescence
Data Source
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AI summary
The present invention relates to a background blocking concept for use in time-resolved fluorometry binding assays. More particular, the invention relates to a binding assay and a kit involving the use of the same or similar chelating ligand in lanthanide chelate-labelled analyte-specific biomolecules and as or in a background blocking agent.