Fluorescent Dyes Using Water-Soluble Polymer Spacers
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Solution Overview
Problem
Conventional fluorescent dyes face limitations such as inter-dye quenching, low fluorescence brightness, and reduced photostability, which affect their effectiveness in biological research and medical diagnostics.
Innovation Solution
Development of fluorescent compounds with a joining moiety containing 1-100 atoms, featuring a fluorophore and water-soluble polymer groups that reduce dimer formation, enhance fluorescence quantum yield, and improve photostability, while maintaining simplicity in synthesis and specificity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple conventional fluorescent dyes are conjugated to a target to maximize brightness, then the number of dye molecules increases, but inter-dye quenching diminishes the effective brightness
Solution Approach 1:
A water-soluble polymer intermediary is introduced between the fluorophore and the target biomolecule. This polymer spacer physically separates multiple fluorophores attached to the same target, preventing them from coming into close proximity where quenching would occur. The polymer acts as a mediating element that maintains optimal spacing while still allowing the fluorophores to function effectively.
Solution Approach 2:
The invention changes the physical and chemical parameters of the dye conjugate by incorporating water-soluble polymer groups. This modification alters the solubility, spacing, and interaction properties of the fluorescent compounds, enabling them to maintain high brightness without the quenching effects that plague conventional hydrophobic dyes.
2Reliability
If sulfonate groups are added to reduce dimer formation, then dimerization decreases, but negative charges disrupt biological activity
Solution Approach 1:
Instead of using sulfonate groups, the invention changes the chemical parameter by employing water-soluble polymer groups with neutral or biocompatible charges. This parameter substitution maintains the anti-aggregation effect while eliminating the harmful impact on biological activity. The polymer groups provide steric hindrance and hydrophilic interactions that prevent dimerization without introducing disruptive negative charges.
3Illumination intensity
If rigidified dye structures are used to improve quantum yield, then fluorescence quantum yield increases, but synthesis complexity and aggregation tendency increase
Solution Approach 1:
The invention segments the fluorescent compound into distinct functional modules: a fluorophore core and a separate water-soluble polymer group. This segmentation allows the fluorophore to maintain its quantum yield properties while the polymer segment provides solubility and prevents aggregation. The modular structure simplifies synthesis compared to highly rigidified fused ring systems.
Solution Approach 2:
The invention creates a composite fluorescent compound combining an organic fluorophore with a water-soluble polymer. This composite structure integrates the high quantum yield of rigid fluorophores with the solubility and anti-aggregation properties of polymers, achieving superior performance without the synthesis complexity of fully rigidified molecular structures.
4Ease of operation
If conventional fluorescent dyes are used, then ease of handling is good, but inter-dye quenching reduces effective brightness
Solution Approach 1:
The water-soluble polymer acts as an intermediary spacer that physically separates fluorophores while maintaining ease of handling. The polymer chains provide steric bulk that prevents dye-dye interactions without complicating the handling or conjugation process. This intermediary approach preserves the user-friendly characteristics of conventional dyes while eliminating the quenching problem.
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 aggregation, increased fluorescence brightness, improved photostability, and extended serum half-life, making them suitable for effective labeling of biomolecules and applications in diagnostics and imaging.
Implementation Method 1
Fluorescent compounds comprise a fluorophore and at least one water soluble polymer group
Implementation Method 2
Dimer formation may be driven by hydrophobic interaction. Because many traditional fluorescent dyes, such as various rhodamine dyes and cyanine dyes, are highly hydrophobic aromatic compounds, these commonly used dyes are particularly prone to forming dimers on labeled biomolecules
Data Source
AI summary
The present invention relates to fluorescent dyes. The present invention provides a wide range of fluorescent dyes and kits containing the same, which are applicable for labeling a variety of biomolecules, cells and microorganisms. In one aspect, the invention provides a compound having a maximal fluorescence excitation wavelength, wherein the compound has a structure of Formula II:wherein Z− is a counterion, Y is a bridge unit permitting electron delocalization between F and Ψ, and F is a moiety having the structure:The present invention also provides various methods of using the fluorescent dyes for research and development, forensic identification, environmental studies, diagnosis, prognosis, and/or treatment of disease conditions.