FRET Nanoparticles for Ratiometric Singlet Oxygen Detection
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Solution Overview
Problem
Current fluorescent probes for detecting singlet oxygen are not suitable for in vivo applications, particularly for intracellular imaging, due to limitations in their ability to accurately quantify singlet oxygen levels without specialized techniques.
Innovation Solution
A composition comprising nanoparticles with an energy donor and an energy acceptor that utilize Fluorescence Resonance Energy Transfer (FRET) or electron exchange energy transfer mechanisms to detect and quantify singlet oxygen, where the energy acceptor reacts with singlet oxygen to reduce energy transfer, allowing for ratiometric detection through changes in light emission intensity at specific wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional fluorescent probes are used for singlet oxygen detection, then detection capability is achieved, but measurement precision and reliability are insufficient for in vivo applications
Solution Approach 1:
The patent changes the detection mechanism from direct fluorescence emission to FRET-based energy transfer efficiency measurement. By monitoring the efficiency of energy transfer from the photoluminescent polymer to the luminescent molecule, and how this efficiency changes upon singlet oxygen reaction, the system achieves ratiometric detection that is both precise and reliable for in vivo applications
Solution Approach 2:
The patent creates a composite nanoparticle system combining a photoluminescent polymer (energy donor) with a luminescent molecule (energy acceptor) that reacts with singlet oxygen. This composite structure enables dual-emission ratiometric detection, where the ratio of donor to acceptor emission intensities provides accurate quantification of singlet oxygen levels in complex biological environments
2Measurement precision
If FRET mechanism is implemented in nanoparticle composition, then energy transfer efficiency can be modulated by singlet oxygen, but device complexity increases
Solution Approach 1:
The patent divides the detection system into two functional segments within the nanoparticle: an energy donor segment (photoluminescent polymer) and an energy acceptor segment (luminescent molecule). This segmentation allows independent optimization of each component's properties while maintaining a relatively simple overall nanoparticle structure that can be synthesized using standard methods
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
Enables accurate and sensitive detection and quantification of singlet oxygen in vivo, facilitating improved intracellular imaging and therapeutic applications by using a ratiometric method that measures light intensity changes in response to singlet oxygen levels.
Implementation Method 1
the photoluminescent polymer at the donor excited state can emit light through fluorescence or phosphorescence
Implementation Method 2
the photoluminescent polymer at the donor excited state can emit light through fluorescence or phosphorescence
Implementation Method 3
The energy transfer mechanism can be a Fluorescence Resonance Energy Transfer (FRET) or an electron exchange energy transfer
Implementation Method 4
the luminescent molecule at the acceptor excited state can emit light through fluorescence or phosphorescence
Implementation Method 5
the luminescent molecule at the acceptor excited state can emit light through fluorescence or phosphorescence
Implementation Method 6
In the presence of the molecule at the singlet state, the energy acceptor reacts with the molecule to reduce a degree of energy transfer on the energy transfer mechanism
Data Source
AI summary
A composition, as well as methods using the composition, for detection or quantification of a molecule at a singlet state (e.g., singlet oxygen). The composition includes one or more nanoparticles, and the nanoparticle has an energy donor, an energy acceptor associated with the energy donor, and an energy transfer mechanism between the energy donor and the energy acceptor.