Silicon-Modified Fluorescent Probe for Multiplexed Imaging
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Solution Overview
Problem
Existing fluorescent probes using fluorescein as a parent compound face limitations due to overlapping fluorescence wavelengths and the need for precise oxidation potential control, restricting structural modifications, especially at the 10-position oxygen atom of the xanthene ring, which hinders simultaneous use in molecular imaging and sensitive measurement applications.
Innovation Solution
Development of a fluorescent probe with a silicon atom replacing the oxygen atom at the 10-position of the xanthene ring, offering significantly deviated maximal absorption wavelengths between non-dissociated and dissociated forms, enabling highly sensitive pH and enzyme measurements without relying on intramolecular photoinduced electron transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If fluorescein-based dyes are used for molecular imaging, then high water solubility and fluorescence quantum yield are achieved, but fluorescence wavelengths overlap preventing simultaneous use of multiple dyes
Solution Approach 1:
The patent replaces the oxygen atom at the 10-position of the xanthene ring with a silicon atom, fundamentally changing the optical parameters of the fluorophore. This substitution shifts the fluorescence emission spectrum to a different wavelength range, enabling multiplexed imaging while preserving the high quantum yield characteristic of fluorescein-based dyes
2Measurement precision
If intramolecular photoinduced electron transfer is used for probe design, then sensitive detection is achieved, but precise oxidation potential control is required limiting structural modification
Solution Approach 1:
By substituting the oxygen atom with silicon at the 10-position, the patent changes the electronic structure and oxidation potential characteristics of the core fluorophore. This parameter change enables the development of probes based on dissociation/cyclization mechanisms rather than photoinduced electron transfer, thereby reducing structural design constraints while maintaining detection sensitivity
3Measurement precision
If oxygen atom at 10-position of xanthene ring is replaced with silicon atom, then significantly deviated maximal absorption wavelengths between non-dissociated and dissociated forms are achieved, but such compounds have not been previously reported
Solution Approach 1:
The patent systematically investigates the optical properties of silicon-substituted xanthene compounds, establishing their characteristic large wavelength separation between protonated and deprotonated forms. This parameter change creates a new class of fluorophores with enhanced performance for pH and enzyme detection, transforming an untested compound class into a reliable platform for molecular imaging
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 silicon-modified fluorescent probe allows for sensitive measurement of pH and enzymes with improved spectral separation, enhancing imaging capabilities and reducing structural design constraints, while avoiding the need for precise oxidation potential control.
Implementation Method 1
the maximal absorption wavelengths of the non-dissociated form (neutral form) and dissociated form (anion form) of such a compound significantly deviated
Implementation Method 2
fluorescent probe, capable of highly sensitive measurement of pH, various enzymes, and the like, was successfully provided
Data Source
AI summary
A compound represented by the formula (I) (R1 represents hydrogen atom or a monovalent substituent; R2 and R3 represent hydrogen atom, an alkyl group, or a halogen atom; R4 and R5 represent an alkyl group or an aryl group; R6 and R7 represent hydrogen atom, an alkyl group, or a halogen atom; R8 represent hydroxy group or a dialkoxyboranetriyl group; and X represents silicon atom, germanium atom, or tin atom), which is a novel fluorophore usable as a mother nucleus of an off/on type fluorescent probe not utilizing the intramolecular photoinduced electron transfer.