Multichromophore Labeling Compound With Linkers to Prevent Quenching
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Solution Overview
Problem
Existing fluorescent dyes used for fluorescence labeling exhibit decreased fluorescence intensity due to self-association and interactions, particularly when multiple dye molecules are bonded to a biological molecule, leading to reduced brightness.
Innovation Solution
A compound with two or more phosphor moieties linked through a structure containing a nitrogen-containing saturated 5-membered ring, such as a proline-derived linker, which suppresses intramolecular and intermolecular associations, maintaining high fluorescence intensity in solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple fluorescent dye molecules are bonded to a biological molecule to increase brightness, then the fluorescence intensity should increase, but the fluorescence intensity decreases due to self-association and interactions between dyes
Solution Approach 1:
A spacer molecule is introduced as an intermediary between phosphor moieties to prevent direct interaction and self-association. The spacer acts as a physical barrier that maintains separation between dye molecules while allowing them to remain part of the same conjugated system, thereby preventing fluorescence quenching while maintaining brightness enhancement
Solution Approach 2:
The molecule is segmented into distinct functional regions: phosphor moieties for light emission and spacer regions for separation. This segmentation allows multiple phosphor units to be distributed throughout the molecule with controlled spacing, preventing aggregation while maintaining the multiplicative brightness effect
2Ease of manufacture
If phosphor moieties are linked directly to each other to form a conjugated system, then the molecule can be synthesized, but energy transfer occurs between phosphor moieties causing decreased fluorescence intensity
Solution Approach 1:
The spacer serves as a mediating structure that connects phosphor moieties through a controlled linkage. This intermediary connection allows the phosphor units to be part of the same molecular system for synthesis purposes while preventing direct energy transfer that would cause fluorescence quenching
Solution Approach 2:
The energy transfer parameter is changed by introducing the spacer, which alters the electronic coupling between phosphor moieties. The spacer modifies the distance and orientation parameters between phosphor units, thereby changing the energy transfer efficiency from high (direct linkage) to low (spacer-mediated linkage), preserving fluorescence intensity
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 maintains excellent fluorescence intensity by preventing energy transfer between phosphor moieties, ensuring brightness is proportional to the number of phosphor moieties present.
Implementation Method 1
a phosphor moiety I (an energy donor) that is excited with excitation light is linked, by a group containing proline, to another phosphor moiety II (an energy acceptor) that receives energy from the phosphor moiety I and emits light or is quenched
Implementation Method 2
a coloring agent compound that utilizes a fluorescence resonance energy transfer (FRET) phenomenon is known
Data Source
AI summary
A compound containing two or more phosphor moieties having light absorption characteristics that are equivalent to each other, in which each of the phosphor moieties adjacent to each other is linked through a group containing a structure represented by General Formula (I), and a labeled biological substance using the compound. In the formula, X1 to X3 represent -O-, -S-, >NR1, or >CR2R3, R1 to R3 and R11 represent a hydrogen atom or a substituent, R8 represents a hydrogen atom or a substituent, n represents an integer of 2 or more, and * represents a bonding site.