Charged Linker Dyes Prevent Fluorescence Quenching
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Solution Overview
Problem
Existing dimeric and polymeric fluorescent or colored dyes do not achieve the desired increase in brightness due to intramolecular fluorescence quenching, limiting their effectiveness in analytical methods.
Innovation Solution
Development of water-soluble dyes with two or more fluorescent or colored moieties covalently linked by a charged linker, which reduces intramolecular fluorescence quenching through electrostatic repulsion, resulting in brighter and more intensely colored compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If dimeric and polymeric compounds comprising two or more fluorescent and/or colored moieties are prepared to increase brightness, then the number of fluorescent moieties is increased, but intramolecular fluorescence quenching occurs and brightness is not achieved
Solution Approach 1:
A charged linker molecule is introduced as an intermediary between fluorescent moieties to prevent direct harmful interactions. The linker's charge creates electrostatic repulsion that maintains spatial separation, preventing intramolecular quenching while still connecting the moieties into a dimeric or polymeric structure that increases overall brightness.
Solution Approach 2:
The physical and chemical parameters of the linker are specifically designed to control the spatial arrangement of fluorescent moieties. By adjusting the linker's charge, length, and flexibility, the distance and orientation between moieties are optimized to prevent quenching while maintaining structural integrity and water solubility.
2Quantity of substance
If multiple fluorescent moieties are linked together to form dimeric and polymeric dyes, then the potential signal intensity is increased, but the dyes do not achieve the desired increase in brightness
Solution Approach 1:
The charged linker serves as a mediator that enables the association of multiple fluorescent moieties while preventing the harmful effect of quenching. This allows the system to achieve the benefits of having multiple moieties (increased potential signal) without suffering from their negative interactions.
Solution Approach 2:
Different parts of the dye molecule are given different functions: the fluorescent moieties provide light-emitting capability, while the charged linker provides spatial separation and electrostatic repulsion. This functional differentiation allows each component to optimize its role without interfering with others.
3Measurement precision
If dimeric and polymeric dyes are developed to provide intense color and fluorescence, then the signal-to-noise ratio should improve, but intramolecular quenching reduces the signal
Solution Approach 1:
The charged linker acts as a protective intermediary that shields fluorescent moieties from each other, preventing energy transfer that would result in quenching. This maintains high signal intensity needed for improved signal-to-noise ratio in analytical measurements.
Solution Approach 2:
The electrostatic repulsion between charged linkers, which might seem to prevent close association of moieties, is actually converted into a beneficial effect by maintaining optimal separation distance that prevents quenching while still allowing the multiplicative brightness effect of multiple moieties.
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 dyes are significantly brighter than their monomeric counterparts, enabling intense color or fluorescence without prior illumination, and can be used for visual detection of analyte molecules in various analytical methods, including biomolecules, with improved signal-to-noise ratio.
Implementation Method 1
electrostatic repulsion of the charged linker acts to maintain the spatial distant between the fluorescent and/or colored moieties, and thus intramolecular fluorescence quenching is reduced and/or eliminated
Implementation Method 2
Fluorescent and/or colored dyes are known to be particularly suitable for applications in which a highly sensitive detection reagent is desirable
Data Source
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AI summary
Compounds useful as fluorescent or colored dyes are disclosed. The compounds have the following structure (I): including stereoisomers, salts and tautomers thereof, wherein R1, R2, R3, R4, R5, L1, L2, L3, L4, M, m and n are as defined herein. Methods associated with preparation and use of such compounds are also provided.