Dichromic Fluorescent Compounds for Deep Tissue Imaging
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Solution Overview
Problem
Current NIR fluorescent dyes face challenges in sensitivity to molecular processes due to poor fluorescence intensity changes, nonspecific interactions, and difficulty in detecting molecular interactions, especially in deep tissue imaging, where ratiometric analysis is hindered by the lack of dual emitting probes and complex requirements for FRET methods.
Innovation Solution
Development of dichromic compounds with distinct fluorescence lifetimes at different emission wavelengths, achieved by conjugating structurally distinct groups to symmetrical or asymmetrical moieties, allowing for asymmetry or symmetry, enabling ratiometric analysis and improved sensitivity in biological imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If NIR fluorescent dyes are used for deep tissue imaging, then light penetration depth is improved, but sensitivity to molecular processes deteriorates due to poor fluorescence intensity changes
Solution Approach 1:
The patent changes the detection parameter from fluorescence intensity to fluorescence lifetime, which maintains sensitivity to molecular processes while enabling deep tissue imaging. The fluorescence lifetime ratiometric probe measures changes in lifetime rather than intensity, overcoming the limitation that NIR dye intensity doesn't change sufficiently for sensitive detection.
Solution Approach 2:
The patent introduces an intramolecular FRET mechanism as an intermediary process within a single molecule. The donor and acceptor dyes are positioned at specific distances (20-50 Å) to enable energy transfer that reports molecular conformational changes, providing sensitive detection without requiring multiple separate dye molecules.
2Measurement precision
If ratiometric methods are used for fluorescence quantification, then measurement accuracy is improved, but device complexity increases due to lack of dual emitting NIR probes
Solution Approach 1:
The patent merges two fluorescent dyes (donor and acceptor) into a single molecular probe structure with defined spatial positioning. This intramolecular design enables ratiometric measurements from one probe rather than requiring two separate probes, simplifying the system while maintaining quantification accuracy.
Solution Approach 2:
The patent pre-positions the donor and acceptor dyes at specific distances (20-50 Å) and orientations within the molecular structure before the measurement is made. This preliminary structural arrangement enables the FRET mechanism to function automatically in response to molecular conformational changes, eliminating the need for complex external positioning equipment.
3Measurement precision
If FRET methods are used to detect molecular interactions, then detection sensitivity is improved, but ease of operation deteriorates due to stringent positioning requirements and multiple dye selection
Solution Approach 1:
The patent combines multiple functional elements (donor dye, acceptor dye, and molecular recognition elements) into a single integrated probe molecule. This eliminates the need to separately select and position multiple dyes, as they are already positioned within the same molecular structure at appropriate distances for FRET.
Solution Approach 2:
The patent creates a universal probe design that can detect various molecular interactions by changing only the molecular recognition elements while maintaining the FRET-active backbone structure. The standardized donor-acceptor positioning (20-50 Å) makes the probe universally applicable to different molecular targets without requiring re-optimization of dye positions.
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 dichromic compounds provide enhanced sensitivity and specificity for monitoring biological events and molecular interactions, enabling effective ratiometric analysis and deep tissue imaging with reduced nonspecific interactions and improved fluorescence intensity changes.
Implementation Method 1
dichromic fluorescent compounds... two distinct fluorescence lifetimes at two different emission wavelengths
Implementation Method 2
selective activation of light emission by fluorescence resonance energy transfer (FRET) or related methods
Data Source
AI summary
The present invention provides dichromic fluorescent compounds, as well as processes for making and methods for using the dichromic fluorescent compounds.