Sulfonated Fluorescence Dyes for Aqueous Analytics
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Solution Overview
Problem
Fluorescence dyes used in chemical, medical, and biological analytics often suffer from non-specific binding to vessel walls and substrate aggregation in aqueous solutions, leading to reduced detection reliability and sensitivity due to their low water solubility and tendency to form non-fluorescing dye aggregates.
Innovation Solution
Development of compounds with sulfonic acid groups incorporated into the dye structure, particularly on nitrogen atoms of the chromophore system, to enhance water solubility and prevent aggregation, allowing for higher degrees of labeling without saturation and maintaining high fluorescence quantum yield even after conjugation to biomolecules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional organic dyes are used as fluorescence markers in aqueous solutions, then detection sensitivity can be high for individual molecules, but non-specific binding to vessel walls and substrate aggregation occur, reducing detection reliability
Solution Approach 1:
The patent modifies the chemical parameters of the dye molecules by introducing sulfonic acid groups (—SO3H) directly onto the chromophore structure. This parameter change fundamentally alters the dye's interaction with aqueous environments, transforming it from hydrophobic to hydrophilic, thereby eliminating non-specific binding and aggregation while preserving fluorescence properties
Solution Approach 2:
The invention applies local quality modification by placing sulfonic acid groups at specific positions on the chromophore structure (such as on nitrogen atoms in xanthene or carbopyronine rings). This localized functionalization targets the specific region responsible for hydrophobic interactions without affecting the overall fluorescence-generating chromophore system
2Measurement precision
If the concentration of dye molecules is increased to enhance fluorescence signal intensity, then detection sensitivity improves, but dye aggregation occurs, causing loss of fluorescence and signal saturation
Solution Approach 1:
By changing the chemical parameter of the dye molecules through sulfonic acid group incorporation, the patent fundamentally alters the intermolecular interaction parameters. The charged sulfonic acid groups create electrostatic repulsion between dye molecules, preventing aggregation even at high concentrations, thus allowing signal intensity to scale linearly with concentration
Solution Approach 2:
The patent converts the potentially harmful hydrophobic interactions that cause aggregation into beneficial hydrophilic interactions. The sulfonic acid groups, which are naturally hydrophilic and charged, create favorable interactions with water molecules, effectively using the aqueous environment itself to prevent aggregation rather than fighting against it
3Measurement precision
If multiple fluorescence dye molecules are coupled to a single biomolecule to increase signal intensity, then detection sensitivity improves, but non-specific binding increases and washing steps cannot remove all non-specifically bound dyes
Solution Approach 1:
The patent changes the surface interaction parameters of the dye molecules by introducing charged sulfonic acid groups. This parameter change creates strong electrostatic repulsion between the anionic dye molecules and typically negatively charged vessel walls and substrates, dramatically reducing non-specific binding even when multiple dyes are present on each biomolecule
Solution Approach 2:
The invention applies preliminary anti-action by pre-equipping the dye molecules with sulfonic acid groups that inherently prevent non-specific binding before the labeling process begins. This preemptive measure ensures that even with high degrees of labeling, the dyes remain resistant to non-specific adsorption on vessel walls and substrates throughout the assay procedure
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 compounds exhibit reduced non-specific binding and aggregation, enabling higher degrees of labeling without fluorescence signal saturation, thus improving detection reliability and maintaining high fluorescence quantum yield in aqueous environments.
Implementation Method 1
The causes of aggregate formation are above all hydrophobic interactions between the dye chromophores and the surrounding water molecules. It is more energy-favorable when two (or more) dye molecules assemble as an aggregate.
Implementation Method 2
This phenomenon can be observed very often in sufficiently concentrated aqueous dye solutions, whereas it normally does not occur in organic solvents. The occurrence of dye aggregates may be seen in the absorption spectrum through a major change in the longwave absorption band
Implementation Method 3
One particular advantage of fluorescence methods is the great detection sensitivity: Due to their fluorescence, even individual molecules can be detected.
Data Source
AI summary
The invention relates to compounds of the general formulae (I)-(IV), which are characterized by substituents B comprising one or more sulfonic acid groups and their use as marker groups for the detection of analytes.