Phosphine DyLight Dye Derivatives for Aqueous Fluorescence
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Solution Overview
Problem
Conventional fluorescent compounds used for biological imaging and analysis, such as cyanine dyes, tend to aggregate and form dimers in aqueous solutions, leading to unsatisfactory signal-to-noise ratios and purification issues due to insufficient hydrophilicity and non-specific interactions with surfaces.
Innovation Solution
Development of phosphine derivatives of DyLight dyes modified with ethylene glycol or polyethylene glycol groups, which increase hydrophilicity and prevent dimer formation, allowing for high-yielding, stereospecific bioorthogonal reactions and improved solubility, enabling effective conjugation to biomolecules for imaging and analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional fluorescent compounds (cyanine dyes) are used for biological imaging, then they provide fluorescence detection capability, but they aggregate and form dimers in aqueous solutions leading to poor signal-to-noise ratios
Solution Approach 1:
The patent modifies the chemical structure of cyanine dyes by introducing ethylene glycol or polyethylene glycol groups at specific positions (such as the N-position of indole heterocycles). This parameter change in molecular composition increases hydrophilicity, which prevents aggregation and dimer formation in aqueous solutions, thereby improving signal-to-noise ratio while maintaining fluorescence properties
Solution Approach 2:
The invention creates composite fluorescent compounds that combine the hydrophobic cyanine chromophore core with hydrophilic ethylene glycol or polyethylene glycol chains. This composite structure allows the molecule to maintain its fluorescence-generating capability while the hydrophilic groups prevent unwanted interactions with aqueous environments and surfaces, resolving the contradiction between detection capability and stability
2Measurement precision
If conventional fluorescent compounds are used, then they provide detection capability, but they exhibit non-specific interactions with various surfaces causing purification problems
Solution Approach 1:
By changing the hydrophilicity parameter through addition of ethylene glycol or polyethylene glycol groups, the compounds gain resistance to non-specific adsorption on surfaces. This modification enables easier purification of conjugates without loss of detection capability, as the hydrophilic groups create a steric and electrostatic barrier against non-specific interactions
3Device complexity
If compounds with insufficient hydrophilicity are used, then they maintain structural simplicity, but they undergo non-specific interactions with surfaces
Solution Approach 1:
The ethylene glycol or polyethylene glycol groups act as intermediary elements between the hydrophobic cyanine chromophore and the aqueous biological environment. These intermediary groups prevent direct contact and non-specific interactions between the chromophore and surfaces, while maintaining the core structural simplicity and fluorescence-generating capability of the original compound
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 modified phosphine derivatives exhibit high hydrophilicity, photo-stability, and storage stability, providing enhanced fluorescence properties and improved specificity in biological applications, including enzyme kinetics, receptor-ligand interactions, and nucleic acid hybridization, with reduced non-specific interactions and easier purification.
Implementation Method 1
The phosphine derivatives are useful in chemoselective ligation reactions, also termed bioorthogonal reactions, e.g., with azido groups to form a covalent bond
Implementation Method 2
These compounds can be excited by monochromatic (e.g., lasers, laser diodes) or polychromatic (e.g., white light sources) light in the ultraviolet (UV), visible, and near infrared (NIR) spectral region to generate emission of fluorescence light
Data Source
AI summary
A phosphine derivative of DyLight dyes modified with ethylene glycol or (poly)ethylene glycol groups. In one embodiment, the compounds are useful in chemoselective ligation reactions.