Luminescent Compound Time-Resolved Cellular Imaging
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Solution Overview
Problem
Current luminescent compounds used for imaging cellular compositions primarily exhibit a single emergent, turn-off/turn-on paradigm, limiting their ability to report detailed information about their environments.
Innovation Solution
Development of luminescent compounds that exhibit multiple distinct luminescent states based on chemical environment, utilizing time-resolved spectroscopic techniques to differentiate between these states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If steady-state emission spectroscopy is used to image cellular compositions with AIE compounds, then the imaging process is simple and rapid, but the ability to distinguish between different chemical environments is limited
Solution Approach 1:
The patent transitions from steady-state emission spectroscopy (one-dimensional measurement of emission intensity) to time-resolved fluorescence lifetime imaging (adding the time dimension). By measuring the fluorescence lifetime in addition to emission intensity, the system can distinguish between different chemical environments even when emission wavelengths overlap, thereby resolving the contradiction between operational simplicity and measurement precision.
2Reliability
If AIE compounds are used to report environmental information, then they provide turn-off/turn-on switching signals, but they cannot provide nuanced information about specific chemical environments
Solution Approach 1:
The patent utilizes changes in fluorescence lifetime as an additional parameter to report environmental information. Different chemical environments (such as lipid droplets vs. aqueous phases) cause distinct changes in the fluorescence lifetime of the AIE compound, providing nuanced information about the specific chemical environment beyond simple turn-off/turn-on signals.
3Measurement precision
If multiple luminescent states with different emission wavelengths are used to distinguish chemical environments, then environmental information can be obtained, but the emission spectra overlap makes differentiation difficult
Solution Approach 1:
The patent resolves spectral overlap interference by measuring fluorescence lifetime in the time domain rather than relying solely on wavelength differentiation in the frequency domain. Different chemical environments produce distinct fluorescence lifetime signatures even when emission wavelengths overlap, enabling clear environmental differentiation without spectral interference.
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 detailed imaging of cellular compositions by distinguishing between different chemical environments within cells, even when emission wavelengths overlap, thereby providing more nuanced environmental information.
Implementation Method 1
imaging the cellular composition with a time-resolved spectroscopic technique
Implementation Method 2
Aggregation-induced emission (AIE) is a luminescence phenomenon characterised by large changes in the emission intensities of luminophores as a function of their solvation states
Data Source
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Figure 5(A)~5(E)
AI summary
A method of imaging a cellular composition is disclosed. The method comprises the steps of contacting the cellular composition with a luminescent compound and imaging the cellular composition with a time-resolved spectroscopic technique. The luminescent compound exhibits a first luminescent state having a first emission lifetime in a first chemical environment and a second luminescent state having a second, different, emission lifetime in a second chemical environment. Also disclosed are luminescent compounds, compositions comprising an amphiphilic polymer and a luminescent compound, and the use of a luminescent compound in combination with a time-resolved spectroscopic technique for imaging a cellular composition.