AIE-Active Fluorescent Particles for Bioimaging
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Solution Overview
Problem
Conventional fluorescent particles suffer from concentration quenching at high concentrations, limiting their brightness and suitability for detecting small targets, and quantum dots are toxic and have low fluorescence yield.
Innovation Solution
Development of fine fluorescent particles using AIE-active compounds that do not covalently bind to polymeric resins, allowing for higher aggregation and luminance, with silole molecules incorporated into polystyrene particles to achieve high luminance and low toxicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional fluorescent substances with extended π-conjugated systems are used at high concentration, then the amount of fluorescent substance per unit can be increased, but concentration quenching occurs and emission intensity is drastically reduced
Solution Approach 1:
The patent changes the molecular structure parameter from planar extended π-conjugated systems to AIE-active compounds with specific spatial arrangements (e.g., tetraphenylethene core with phenyl groups). This structural parameter change enables the compound to exhibit aggregation-induced emission, where fluorescence intensity increases with concentration rather than decreasing, thereby resolving the concentration quenching problem while allowing high amounts of fluorescent substance per unit.
2Illumination intensity
If quantum dots are used to achieve high brightness, then fluorescence yield can be improved, but toxicity from cadmium or selenium makes them unsuitable for in vivo use
Solution Approach 1:
The patent employs organic AIE-active compounds as fluorescent substances instead of inorganic quantum dots containing toxic elements. These organic compounds can be incorporated into polymeric resins to form fluorescent particles that exhibit high fluorescence yield without the toxicity associated with cadmium or selenium-based quantum dots, making them suitable for in vivo applications.
Solution Approach 2:
The patent creates composite fluorescent particles by incorporating AIE-active compounds into polymeric resin matrices. This composite structure combines the high fluorescence yield of the AIE-active compound with the biocompatibility and processability of the polymeric resin, achieving both high brightness and low toxicity simultaneously.
3Measurement precision
If conventional fluorescent substances are used to label small targets, then detection sensitivity can be improved, but concentration quenching limits the brightness available for detection
Solution Approach 1:
The patent changes the concentration-dependence parameter of the fluorescent substance from negative (concentration quenching) to positive (aggregation-induced emission). AIE-active compounds exhibit enhanced fluorescence at higher concentrations, allowing the use of high amounts of fluorescent material per unit to achieve both high brightness for detection sensitivity and avoiding the quenching that would otherwise limit performance.
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 resulting particles exhibit high luminance and fluorescence quantum yield, enabling effective detection of small targets with low biological toxicity, suitable for bioimaging in vivo.
Implementation Method 1
a phenomenon by which molecules, in which multiple aryl groups and the like bind to one another such that they surround a ring in the center, aggregate with one another and emit fluorescence with high efficiency by ultraviolet irradiation
Data Source
AI summary
It is an object of the present invention to provide a fine fluorescent particle, which does not cause concentration quenching and has low ecotoxicity. Specifically, the present invention relates to a fine fluorescent particle containing an AIE-active compound, the particle consisting of a network polymer, wherein the fine fluorescent particle is characterized in that the AIE-active compound is, for example, a compound represented by the following formula (1):wherein E represents silicon or germanium; R1 and R2, which are the same or different, each represent a hydrocarbon group containing 1 to 6 carbon atoms, or a substituted or unsubstituted phenyl group; and R3, R4, R5 and R6, which are the same or different, each represent a substituted or unsubstituted phenyl group.