Polymeric Nanoparticles for Afterglow Molecular Imaging
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Solution Overview
Problem
Current afterglow molecular imaging techniques face challenges due to the limited availability of biologically compatible materials that can produce afterglow luminescence without real-time light excitation, and existing inorganic nanoparticles are hampered by toxicity concerns and limited targeting capabilities.
Innovation Solution
Development of polymeric composite nanoparticles that emit near-infrared afterglow luminescence, comprising a semiconducting polymer, an optional amphiphilic copolymer, and a small molecular dye, which can be used for deep tissue imaging without the need for real-time excitation, utilizing a NIR laser for activation and imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic nanoparticles are used for afterglow luminescence, then afterglow imaging capability is achieved, but toxicity concerns arise
Solution Approach 1:
The patent changes the material composition parameter from inorganic nanoparticles to organic polymer nanoparticles, specifically using poly(p-phenylene vinylene) (PPV) and its derivatives. This parameter change eliminates toxicity while maintaining afterglow luminescence capability, as the organic polymer materials are biocompatible and can be functionalized without introducing harmful inorganic components.
Solution Approach 2:
The patent employs composite material design by combining PPV polymer with various functional groups and moieties (such as carboxyl, hydroxyl, amino groups) to create nanoparticles with both afterglow properties and specific biological functionalities. This composite approach allows the material to maintain biocompatibility while achieving targeted imaging capabilities.
2Reliability
If inorganic afterglow nanoparticles are used, then afterglow signal is produced, but targeting capability is limited
Solution Approach 1:
The patent applies local quality modification by introducing specific functional groups at particular locations on the nanoparticle surface. Different moieties (carboxyl for cell membrane interaction, hydroxyl for protein binding, amino for enzyme interaction) are strategically placed to enable specific targeting functions while preserving the core afterglow luminescence property.
Solution Approach 2:
The patent achieves multi-functionality by designing a universal PPV nanoparticle platform that can be functionalized with various moieties to perform different targeting functions. The same core nanoparticle structure can be adapted for different applications (tumor imaging, inflammation detection, etc.) by simply changing the surface functional groups, eliminating the need for separate nanoparticles for each function.
3Reliability
If real-time light excitation is used for imaging, then imaging capability is maintained, but tissue autofluorescence increases
Solution Approach 1:
The patent applies preliminary action by pre-exciting the PPV nanoparticles to a high-energy state before injection into the living subject. The nanoparticles store this energy and release it as afterglow luminescence without requiring continuous external excitation during the imaging process. This preliminary energy loading eliminates the need for real-time excitation light, thereby avoiding tissue autofluorescence contamination.
Solution Approach 2:
The patent achieves continuous useful action through the afterglow effect, where the nanoparticles continue to emit luminescence signal without requiring continuous external light excitation. The stored energy in the PPV nanoparticles is released gradually over time, providing sustained imaging capability that outlasts the excitation period and eliminates the need for concurrent light sources during imaging.
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 polymeric nanoparticles provide effective afterglow luminescence for deep tissue imaging, overcoming toxicity issues and enhancing imaging sensitivity and specificity, allowing for the visualization of pathological conditions at the molecular level without the need for concurrent light excitation.
Implementation Method 1
Afterglow luminescence is an intrinsic luminescent process that occurs after the end of light excitation. Afterglow luminescence is generally caused by the slow release of photons from energy traps in the material in question upon thermal simulation.
Implementation Method 2
The irradiation of the PPV-based SPNs forms unstable chemical defects (dioxetane units) that can spontaneously and slowly break down to release photons that result in afterglow luminescence.
Data Source
AI summary
Disclosed herein are semiconducting polymers of formula I and polymeric composite materials containing said polymer, where said polymer displays near-infrared afterglow luminescence. The polymers of formula I have the following structure:where n, m, o, p, A and R1 to R7 are as defined herein, and r is used to denote a random order to the repeating units.