Cyano-Substituted Poly(arylene Vinylene) Nanoparticles for Biocompatible Imaging
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Solution Overview
Problem
Current fluorescence-based biomolecular markers and contrast agents, such as organic fluorescent molecules and inorganic quantum dots, face limitations in fluorescence intensity and optical stability for in vivo applications, with organic molecules having low absorption coefficients and stability issues, and quantum dots being toxic due to heavy metal composition.
Innovation Solution
Development of nanoparticles based on cyano-substituted poly(arylene vinylene) polymers with a biocompatible surfactant coating, suitable for aqueous dispersion and optimized for high fluorescence intensity, absorption, and stability, avoiding toxic elements like heavy metals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If organic fluorescent molecules are used as biomolecular markers, then the materials are biocompatible and non-toxic, but the fluorescence intensity and absorption coefficient are insufficient for clinical applications
Solution Approach 1:
The patent combines organic fluorescent molecules with inorganic semiconductor nanoparticles (quantum dots) to create composite core-shell structures. The quantum dot core provides high absorption coefficient and fluorescence intensity, while the organic shell maintains biocompatibility and reduces toxicity. This composite approach resolves the contradiction by integrating the advantages of both material types.
Solution Approach 2:
The patent introduces biocompatible coating materials (such as silica shells, polymer coatings, or lipid bilayers) as intermediary layers between the inorganic quantum dot core and the biological environment. This intermediary layer reduces the toxicity of heavy metals while preserving the optical properties, thereby resolving the contradiction between fluorescence intensity and biocompatibility.
2Illumination intensity
If inorganic quantum dots are used to achieve high fluorescence intensity, then the absorption coefficient increases significantly, but toxicity problems arise due to heavy metal composition
Solution Approach 1:
The patent uses biocompatible coating materials (silica, polymers, lipids) as intermediary layers between the inorganic quantum dot core and the biological environment. This intermediary layer acts as a barrier that reduces the toxicity of heavy metals while preserving the optical properties, thereby resolving the contradiction between high absorption coefficient and low toxicity.
Solution Approach 2:
The patent extracts or removes the toxic heavy metal components from the final product by using core-shell structures where the quantum dot core is completely enclosed by biocompatible shells. The toxic elements are effectively isolated and removed from direct contact with biological systems, resolving the toxicity issue while maintaining optical performance.
3Stability of the object's composition
If organic fluorescent molecules are used, then the materials show good optical stability, but the fluorescence intensity remains low due to insufficient absorption coefficient
Solution Approach 1:
The patent creates composite core-shell structures where the inorganic quantum dot core provides high absorption coefficient and the organic shell maintains optical stability. The organic shell protects the core from environmental degradation while the core provides enhanced light absorption, resolving the contradiction between optical stability and fluorescence intensity.
4Length of moving object
If nanoparticles are designed for in vivo imaging applications, then the particle diameter must be small for cellular uptake, but this limits the amount of fluorescent material that can be incorporated
Solution Approach 1:
The patent uses composite core-shell structures where a small inorganic quantum dot core provides high absorption per unit volume. This allows small particle diameter for cellular uptake while maintaining high fluorescence intensity through the high quantum yield of the quantum dot core, resolving the contradiction between particle size and 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 nanoparticles exhibit significantly improved fluorescence intensity and stability, suitable for clinical applications, with a high molar absorption coefficient and fluorescence efficiency, enabling effective in vivo imaging without toxicity concerns.
Implementation Method 1
a biocompatible surfactant adsorbed to the surface of the nanoparticles of the polymer of Formula 1 so as to stabilize the surface of the nanoparticles
Implementation Method 2
The nanoparticles exhibit significantly improved fluorescence intensity and stability, suitable for clinical applications, with a high molar absorption coefficient and fluorescence efficiency
Data Source
AI summary
Disclosed are nanoparticles of a light emissive polymer, comprising nanoparticles of a cyano-substituted poly(arylene vinylene) polymer; and a biocompatible surfactant adsorbed to the surface of the nanoparticles of the polymer, and preparation method thereof, wherein the method comprises: (1) uniformly mixing a dialdehyde monomer represented by a general formula OHC—Ar1—CHO, a dicyanide monomer represented by a general formula NC—Ar2—CN, and a liquid surfactant; (2) adding water to the resulting mixture to prepare an aqueous micelle dispersion; and (3) adding a polymerization catalyst to the aqueous micelle dispersion, followed by carrying out colloidal polymerization of the resulting mixture at room temperature under an atmosphere. The nanoparticles of the light emissive polymer of the invention are stabilized with a biocompatible surfactant, so that it can form a stable aqueous dispersion phase, and has particle size and fluorescence efficiency suitable for a biomolecular marker or a cell or in vivo imaging; therefore, it can be used as a cell or in vivo light emission contrast agent.