Fluorescent Labeling Compound Linkers That Suppress Dye Association
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Solution Overview
Problem
Fluorescent dye molecules used for fluorescence labeling often experience a decrease in fluorescence intensity due to self-association, which is not effectively suppressed by existing linking groups in compounds utilizing fluorescence resonance energy transfer (FRET) phenomena.
Innovation Solution
A compound is developed with phosphor moieties linked by a linking group having a Molecular Flexibility of 0.510 or less and a cLogP of 6.0 or less, comprising alkynyl groups, aliphatic hydrocarbon rings, or carbonyl groups, to suppress intramolecular and intermolecular associations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a plurality of fluorescent dye molecules are bonded to increase brightness, then fluorescence intensity is improved, but self-association between dyes occurs causing fluorescence intensity to decrease
Solution Approach 1:
A linking group comprising a polyproline backbone with specific substituents (amino acid residues, aromatic hydrocarbon groups, or heterocyclic groups) is introduced as an intermediary between phosphor moieties. This mediator maintains appropriate spacing and orientation while preventing direct interaction between dye molecules, thus avoiding self-association quenching while preserving fluorescence intensity.
Solution Approach 2:
The patent optimizes specific parameters of the linking group including molecular flexibility (0.300 or less), cLogP (5.0 or less), and structural composition (polyproline backbone with specific substituents). These parameter changes enable the linking group to effectively prevent dye association while maintaining the desired fluorescence properties.
2Ease of manufacture
If existing linking groups are used to connect phosphor moieties, then compound structure is achieved, but association of phosphor moieties is not effectively suppressed
Solution Approach 1:
The patent establishes specific parameter thresholds for the linking group: molecular flexibility of 0.300 or less and cLogP of 5.0 or less. These parameter changes differentiate the invention from existing linking groups and enable effective suppression of phosphor moiety association while maintaining manufacturability.
Solution Approach 2:
The linking group is constructed as a composite structure with a polyproline backbone and specific substituents (amino acid residues, aromatic hydrocarbon groups, or heterocyclic groups). This composite design provides both structural integrity for compound formation and functional properties for preventing dye association.
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 compound effectively reduces dye association, maintaining high fluorescence intensity by minimizing quenching, thereby enhancing the performance of labeled biological substances in fluorescence labeling applications.
Implementation Method 1
phosphor moieties adjacent to each other are linked by a linking group having a Molecular Flexibility of 0.510 or less and a cLogP of 6.0 or less
Implementation Method 2
maintaining high fluorescence intensity by minimizing quenching
Implementation Method 3
a coloring agent compound that utilizes a fluorescence resonance energy transfer (FRET) phenomenon
Data Source
AI summary
A compound containing two or more phosphor moieties, in which each of the phosphor moieties adjacent to each other is linked by a linking group having a Molecular Flexibility of 0.510 or less and a cLogP of 6.0 or less, and a labeled biological substance using the compound.