Multichromophore Label Compounds That Suppress Dye Self-Association
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Solution Overview
Problem
Fluorescent dye molecules used for labeling biological substances tend to associate easily, leading to a decrease in fluorescence intensity due to self-association, which is not effectively addressed by existing linking groups in FRET compounds.
Innovation Solution
A compound 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, incorporating alkynyl groups, aliphatic hydrocarbon rings, or carbonyl groups, to suppress intramolecular and intermolecular associations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of fluorescent dye molecules per biological molecule is increased to enhance fluorescence intensity, then the brightness should improve, but self-association between dyes occurs more easily causing fluorescence intensity to decrease
Solution Approach 1:
The patent divides the fluorescent labeling system into separate functional components: a biological molecule with multiple binding sites and a fluorescent dye with multiple reactive groups. This segmentation allows controlled labeling where the degree of fluorescence labeling (DOL) can be optimized without excessive dye-dye interactions, as the dyes are distributed across multiple labeling positions rather than clustered densely
Solution Approach 2:
The patent changes the chemical parameters of the fluorescent dye by using heterocyclic ring structures (such as triazine, pyrimidine, or pyridine rings) instead of traditional aromatic chromophores. This parameter change reduces the planarity and aromaticity of the dye core, thereby decreasing the tendency for self-association while maintaining fluorescence properties
2Device complexity
If conventional linking groups are used in FRET compounds to connect phosphor moieties, then the compound structure is simplified, but the association of phosphor moieties is not effectively suppressed
Solution Approach 1:
The patent applies local quality by introducing specific heterocyclic ring structures (triazine, pyrimidine, or pyridine rings) at the linking group positions between phosphor moieties. These localized structural modifications create regions of reduced planarity and adjusted electronic properties that specifically suppress phosphor-phosphor association without requiring complete restructuring of the entire molecule
Solution Approach 2:
The patent creates composite molecular structures by combining different heterocyclic ring systems with phosphor moieties through specific linking groups. This composite approach integrates multiple functional elements (heterocyclic rings for association suppression, phosphor moieties for fluorescence) into a unified structure that achieves both structural simplicity and effective association suppression
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, thus enhancing the performance of labeled biological substances.
Implementation Method 1
a coloring agent compound that utilizes a fluorescence resonance energy transfer (FRET) phenomenon is known. As a coloring agent compound that utilizes such a FRET phenomenon, for example, a compound in which a phosphor moiety I (an energy donor) that is excited with excitation light is linked, by a group containing peptide such as polyproline, to another phosphor moiety II (an energy acceptor) that receives energy from the phosphor moiety I and emits light or is quenched
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.