Boron Nitride Nanotube Capsule for Fluorogenic Probe Stability
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Solution Overview
Problem
Current fluorescence probes face limitations such as photobleaching, chemical reactivity, and instability due to environmental factors, particularly in the near-infrared (NIR) spectral range, which hampers their effectiveness in imaging applications.
Innovation Solution
Encapsulation of fluorogenic molecules within boron nitride (BN) nanotubes, which provides a stable and transparent environment for fluorescence emission, enhancing photostability and shifting the emission spectrum to the NIR range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorogenic dyes are used for fluorescence imaging, then optical contrast and labeling capability are provided, but photobleaching and chemical reactivity occur leading to unstable fluorescence emission
Solution Approach 1:
The patent introduces boron nitride nanotubes as an intermediary material that encapsulates fluorogenic dyes. The BN nanotube shell acts as a protective mediator between the dye molecules and the external environment (oxygen, water, quenchers), preventing photobleaching and chemical reactions while allowing fluorescence emission to pass through. This resolves the contradiction by providing environmental protection without compromising optical performance.
Solution Approach 2:
The boron nitride nanotube creates an inert protective environment around the fluorogenic dye molecules. The BN material is chemically inert and resistant to oxidation, effectively isolating the dye from reactive species in the surrounding environment. This inert encapsulation environment prevents photobleaching and chemical degradation, ensuring stable fluorescence emission over time.
2Reliability
If dyes are encapsulated in porous materials like mesoporous silica, then protection from environmental quenchers is provided, but dielectric quality is poor and quenching defects remain
Solution Approach 1:
The patent changes the material parameter from conventional porous materials (silica, polymers) to boron nitride nanotubes. This material substitution provides superior dielectric properties and eliminates quenching defects while maintaining the protective encapsulation function. The BN nanotube's unique electronic structure and wide bandgap prevent energy transfer quenching that occurs in other materials.
Solution Approach 2:
The invention creates a composite structure where fluorogenic dye molecules are encapsulated within boron nitride nanotubes. This composite system combines the fluorescent properties of the dye with the protective and optically transparent properties of BN nanotubes, achieving both protection from quenchers and high dielectric quality without the defects present in single-material systems.
3Reliability
If dyes are encapsulated in organic materials like polymers, then some protection is provided, but structural stability is insufficient and molecular diffusion is not completely stopped
Solution Approach 1:
The boron nitride nanotube provides a robust inert environment that completely encapsulates the fluorogenic dye molecules. The rigid BN nanotube structure prevents molecular diffusion and maintains structural stability, overcoming the limitations of soft polymer materials that allow dye migration and degradation over time.
4Length of stationary object
If fluorescence probes are designed for deep tissue imaging in NIR range, then imaging depth is improved, but photostability and brightness are reduced due to environmental factors
Solution Approach 1:
The BN nanotube serves as a protective intermediary that enables the fluorogenic dye to maintain high photostability and brightness even when designed for deep tissue NIR imaging. The encapsulation protects against environmental degradation that would otherwise reduce signal quality at imaging depths where longer wavelengths are required.
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 encapsulation within BN nanotubes significantly improves the photostability and spectral properties of the probes, allowing for stable and bright fluorescence emission in the NIR range, suitable for deep tissue imaging and bio-applications.
Implementation Method 1
Encapsulation of fluorogenic molecules within boron nitride (BN) nanotubes, which provides a stable and transparent environment for fluorescence emission
Implementation Method 2
The aggregate emits a fluorescent signal at one or more wavelengths within the fluorescence spectral range when the probe is illuminated by an excitation light beam
Implementation Method 3
emits a fluorescent signal at one or more wavelengths within the fluorescence spectral range... the fluorescent spectral range is in the near-infrared region of the spectrum
Data Source
AI summary
A fluorescent probe having a capsule of nanometric size and an aggregate of fluorogenic molecules coupled to the capsule is provided. The aggregate emits a fluorescent signal at one or more wavelengths within the fluorescence spectral range when the probe is illuminated by an excitation light beam at one or more wavelengths within the excitation spectral range. Preferably, the fluorescent spectral range is in the near-infrared region of the spectrum. In some embodiments, the capsule is a boron nitride (BN) nanotube and the aggregate comprise 3,6-Bis[2,2′]bithiophenyl-5-yl-2,5-di-n-octylpyrrolo[3,4-c]pyrrole-1,4-dione as fluorogenic molecules. In some embodiments, the 3,6-Bis[2,2′]bithiophenyl-5-yl-2,5-di-n-octylpyrrolo[3,4-c]pyrrole-1,4-dione fluorogenic molecules are in a J-aggregation state.