Covalently Bonded Fluorophore Nanoparticles for Brain Mapping
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Solution Overview
Problem
Current neuronal tracers are limited by their inability to provide sufficient spectral diversity for accurate neural anatomy characterization, as they often rely on single emission wavelengths and are prone to leakage and imaging imprecision due to noncovalent fluorophore encapsulation and surface functionalization, restricting their use to specific electromagnetic spectra and imaging methods.
Innovation Solution
Development of nanoparticles with covalently bonded fluorophores within their interior bulk, allowing for the creation of multi-color tracing agents through emulsion polymerization, enabling fluorescence, MRI, PET, and SPECT imaging, and providing enhanced stability and spectral coverage from 300 nm to 800 nm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If noncovalent fluorophore encapsulation or surface functionalization is used in existing fluorescent latex particles, then the particle structure is simpler and manufacturing is easier, but fluorophore leakage occurs and imaging precision is reduced
Solution Approach 1:
The fluorophore is covalently bonded to the polymer chain during the emulsion polymerization process itself, before the nanoparticle is formed. This preliminary incorporation ensures the fluorophore is permanently integrated into the particle structure, preventing any subsequent leakage and ensuring consistent fluorescence signal for high-precision imaging.
Solution Approach 2:
The invention creates a composite nanoparticle where the fluorophore and polymer are chemically bonded to form a unified structure. This composite approach combines the structural integrity of the polymer nanoparticle with the fluorescent properties of the embedded fluorophore, eliminating leakage while maintaining manufacturing feasibility through emulsion polymerization.
2Device complexity
If only two types of fluorescent synthetic latex particles with single emission wavelengths are used, then the tracer system is simpler, but spectral diversity is insufficient for accurate neural anatomy characterization
Solution Approach 1:
The emulsion polymerization method described can incorporate various vinyl-containing fluorophores with different emission wavelengths into the same nanoparticle system. This universal approach allows a single nanoparticle formulation to provide multi-spectral imaging capabilities, enabling accurate characterization of complex neural anatomy without requiring multiple different tracer types.
Solution Approach 2:
By changing the type of vinyl-containing fluorophore used in the emulsion polymerization, the emission wavelength of the nanoparticle can be tuned across a broad spectral range. This parameter change approach allows flexible adjustment of tracer properties to match specific imaging requirements while maintaining a consistent nanoparticle platform.
3Stability of the object's composition
If fluorescent latex particles are limited to a specific portion of the electromagnetic spectrum (490-550 nm), then the particle formulation is more stable, but the spectral coverage is insufficient for comprehensive brain mapping
Solution Approach 1:
The invention extends the spectral coverage by selecting fluorophores with different emission characteristics while maintaining the stable emulsion polymerization framework. By changing the fluorophore parameters (molecular structure, conjugation length) within the polymerization process, the system achieves broad spectral coverage from 490 nm to over 650 nm while preserving nanoparticle stability and retrograde transport properties.
4Ease of manufacture
If fluorophores are only functionalized on the outer surface of particles, then the functionalization process is simpler, but the fluorophore amount is limited by surface area and may be insufficient for detection
Solution Approach 1:
Instead of placing fluorophores only on the surface, the invention embeds fluorophores within the interior bulk of the nanoparticle by incorporating them during polymerization. This nested structure allows numerous fluorophores to be contained within each particle volume, dramatically increasing the total fluorophore amount and detection sensitivity while simplifying the manufacturing process to a single-step emulsion polymerization.
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 enable detailed brain mapping and axonal tracing with improved spectral resolution, reduced leakage, and multi-modal imaging capabilities, overcoming the limitations of existing tracers by offering a broader spectral range and increased imaging precision.
Implementation Method 1
a first fluorophore moiety, and nanoparticles, wherein the nanoparticles comprise: a first plurality of a first nanoparticle, the first nanoparticle comprising: a first outer surface, a first interior bulk, and a first polymer, wherein the first polymer is covalently bonded to the first fluorophore moiety within the first interior bulk of the first nanoparticle
Data Source
AI summary
Disclosed is composition comprising: a first fluorophore moiety, and nanoparticles, wherein the nanoparticles comprise: a first plurality of a first nanoparticle, the first nanoparticle comprising: a first outer surface, a first interior bulk, and a first polymer, wherein the first polymer is covalently bonded to the first fluorophore moiety within the first interior bulk of the first nanoparticle. Also disclosed is a composition comprising: a chelate moiety, and nanoparticles, wherein the nanoparticles comprise: a plurality of a chelate nanoparticle, the chelate nanoparticle comprising: an outer surface, an interior bulk, and a polymer, wherein the polymer is covalently bonded to the chelate moiety within the interior bulk of the chelate nanoparticle. Also disclosed are methods of making such compositions and using such composition for brain mapping and tracing of axonal projections.