Ratiometric Fluorescent Particle Characterization
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Solution Overview
Problem
Current methods for characterizing inter- and intramolecular interactions of fluorescently labeled particles face challenges in resolving small alterations in fluorescence spectra, are prone to errors due to environmental changes, and require large sample volumes, making it difficult to analyze temperature-sensitive or unstable samples effectively.
Innovation Solution
A method involving the ratiometric characterization of fluorescently labeled particles by exciting them at a first wavelength and detecting fluorescence emission at two different wavelengths, with the option to repeat under varying conditions, allowing for precise calculation of ratios and localization determination, even in small sample volumes, and with defined temperature perturbations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If FRET measurements are used to characterize intermolecular interactions, then binding reactions can be determined, but the measurements are falsified by undesired changes in the local environment of the fluorophores and have lower signal strength
Solution Approach 1:
The patent extracts the problematic element (environmental sensitivity of fluorescent labels) from the measurement system by using a single fluorescent label that is insensitive to environmental changes, rather than using FRET measurements with two fluorescent labels that are sensitive to environmental changes. This eliminates the source of measurement falsification while maintaining binding reaction characterization capability.
Solution Approach 2:
The patent uses a single fluorescent label that replicates the binding reaction detection function without requiring the donor-acceptor fluorophore pair. The single label provides sufficient signal strength and avoids the environmental sensitivity issues that plague FRET measurements, effectively copying the essential measurement function in a more reliable way.
2Measurement precision
If FRET measurements are performed with two different fluorescent labels, then intermolecular interactions can be characterized, but the signal-to-noise ratio is lower and more sample is required
Solution Approach 1:
The patent removes the unnecessary component (second fluorescent label) from the FRET measurement system. By using a single fluorescent label that can detect binding reactions through spectral changes, the method eliminates the need for donor-acceptor pairs, thereby reducing sample volume requirements and improving signal-to-noise ratio while maintaining interaction characterization capability.
Solution Approach 2:
The patent changes the measurement parameter from relying on energy transfer efficiency between two fluorophores to detecting spectral changes (intensity and/or spectral shifts) of a single fluorophore. This parameter change enables the use of smaller sample volumes and improves signal strength by avoiding the inherent limitations of FRET measurements.
3Adaptability or versatility
If fluorescence spectrophotometers are used to detect alterations in fluorescence spectrum, then measurements can be performed over a large spectral range, but small changes in fluorescence intensity cannot be resolved
Solution Approach 1:
The patent applies local quality by using a single fluorescent label with specific spectral properties that are highly sensitive to binding reactions. Rather than attempting to resolve small intensity changes across a broad spectral range, the method focuses on detecting characteristic spectral shifts and intensity changes of the single label, thereby achieving high precision in a targeted manner while maintaining spectral range adaptability.
4Measurement precision
If combined measurements at multiple wavelengths are performed to enhance resolution, then fluorescence changes can be detected, but the process is more cumbersome and time-consuming
Solution Approach 1:
The patent merges the detection of multiple spectral parameters (intensity and spectral shifts) into a single measurement approach using one fluorescent label. Instead of performing separate measurements at multiple wavelengths with different fluorescent labels, the single label's inherent spectral sensitivity allows simultaneous extraction of binding information from intensity and spectral shift data, thereby maintaining high precision while improving measurement speed and simplicity.
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
This approach enhances sensitivity to detect arbitrarily small alterations in fluorescence spectra, enables fast measurements of temperature-sensitive samples, and determines thermodynamic and kinetic parameters, while reducing sample consumption and improving signal-to-noise ratios.
Implementation Method 1
exciting the fluorescently labeled particles at a first wavelength, c) detecting the fluorescence emission intensity of the fluorescently labeled particles at a second and a third wavelength
Data Source
AI summary
The present invention relates to devices and methods for the characterization of fluorescently labeled particles in solution by analyzing alterations in the fluorescence spectrum of the fluorescently labeled particles. In particular, a sample of fluorescently labeled particles is analyzed under different conditions/environments by fluorescent excitation and detection of the corresponding fluorescence emissions. The particles are characterized by analyzing the detected fluorescence emissions under these different conditions/environments. More specifically, the present invention relates to methods and devices for ratiometric characterization of inter- and/or intramolecular interactions, and/or conformational modifications and/or localization of fluorescently labeled particles.