Two-Photon Fluorescent Probe for MAO Enzyme Imaging
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Solution Overview
Problem
Current two-photon absorbing fluorescent substances lack effective probes for sensing monoamine oxidase (MAO) enzyme activity and substrates, particularly for in-vivo imaging and disease treatment, with limited research on two-photon absorbing fluorescent probes based on coumarin derivatives.
Innovation Solution
Development of novel two-photon absorbing fluorescent substances, such as IminoPOS, with high photo-stability and large two-photon absorption cross-section, and their precursors, which can react with specific substrates to generate fluorescent probes for MAO enzyme activity sensing and imaging, including compounds with R groups like vinyl ether and t-butyldimethylsilyl ether for selective substrate detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two-photon absorbing fluorescent substances are used for in-vivo imaging, then cell permeability and resolution are improved, but fluorescence efficiency and brightness are reduced compared to one-photon substances
Solution Approach 1:
The patent develops compound 1 as a hybrid fluorescent substance that combines the two-photon absorbing core structure (providing high resolution and low quenching) with coumarin derivative moieties (providing high fluorescence efficiency). This composite molecular structure enables the substance to exhibit both two-photon absorption characteristics for deep tissue imaging and high fluorescence quantum yield for bright signal detection.
2Reliability
If acedan-based two-photon fluorescent substances are used, then photo-stability and two-photon absorption cross-section are improved, but fluorescence efficiency is reduced
Solution Approach 1:
The patent merges the structurally stable two-photon absorbing unit (resembling acedan) with the highly fluorescent coumarin derivative unit into a single integrated molecule. The two-photon absorbing core maintains photo-stability while the coumarin moieties contribute high fluorescence efficiency, achieving both properties simultaneously in compound 1.
3Illumination intensity
If one-photon absorbing fluorescent substances are used for enzyme sensing, then fluorescence efficiency is improved, but cell permeability and in-vivo imaging capability are reduced
Solution Approach 1:
The patent creates a fluorescent probe (compound 1) that possesses multiple functions: it exhibits two-photon absorption for deep tissue penetration and high-resolution imaging, maintains high fluorescence efficiency for sensitive detection, and enables enzyme sensing through its reactive group. This multi-functional design allows the single compound to replace both one-photon fluorescent substances and two-photon substances in different applications.
4Measurement precision
If reaction-based fluorescent probes are developed for substrate sensing, then sensitivity and selectivity are improved, but device complexity and synthesis difficulty increase
Solution Approach 1:
The patent incorporates a pre-installed reactive group (vinyl ether or t-butyldimethylsilyl ether) into the fluorescent probe structure during synthesis. This reactive group is designed to specifically react with the target enzyme (MAO) or substrate, enabling the probe to undergo a chemical transformation that activates or enhances fluorescence signal only upon encountering the target, thereby achieving high sensitivity and selectivity.
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 fluorescent substances demonstrate high sensitivity and selectivity in both one-photon and two-photon microscopy, enabling effective MAO enzyme activity measurement and inhibitor screening, as well as in-vivo imaging, particularly for diseases like Parkinson's disease and depression.
Implementation Method 1
A two-photon (TP) absorbing fluorescent substance is excited by receiving energy with a wavelength corresponding to a half of a one-photon (OP) absorbing fluorescent substance to have an excitation characteristic
Implementation Method 2
a two-photon absorbing fluorescent substance... has a characteristic capable of implementing a very high resolution because only a focus portion thereof is excited
Data Source
AI summary
Disclosed is a compound which is a two-photon absorbing fluorescent substance, a production method for the compound, a fluorescence sensor and molecular probe able to sense various substrates or enzyme activity or the like using the same, and a method of sensing enzyme activity or the like using the same. The disclosed compound can be used as a fluorescence sensor, and can be used in the study and treatment of diseases in which MAO enzymes are involved such as mood disorders using MAO enzyme activity and inhibitor screening.