Fluorinated 7-Hydroxycoumarin Compounds for Acidic Microorganism Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fluorescent indicators for detecting microorganisms, such as 7-hydroxycoumarin-based compounds, are ineffective in acidic environments and require alkaline conditions for maximum fluorescence, which is not suitable for samples with acidic pH due to metabolic processes of microorganisms like E. coli, leading to diminished fluorescence signals.
Innovation Solution
Development of fluorinated 7-hydroxycoumarin compounds that are fluorescent under acidic conditions, either inherently or after enzyme-mediated hydrolysis of an enzyme-labile group, allowing for stable fluorescence signals in acidic environments and utilizing excitation wavelengths around 400 nanometers for reduced background interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If 7-hydroxycoumarin-based compounds are used as fluorescent indicators, then fluorescence signal is maximized under alkaline conditions, but fluorescence signal is diminished under acidic conditions
Solution Approach 1:
The patent introduces fluorinated derivatives of 7-hydroxycoumarin compounds where the fluorine substitution at specific positions (e.g., 6-fluoro, 8-fluoro) fundamentally changes the pH-dependent fluorescence characteristics. This parameter change in molecular structure enables the compound to maintain high fluorescence quantum yield across a broader pH range, particularly under acidic conditions where conventional umbelliferones fail. The fluorine atom's electron-withdrawing effect modifies the electronic distribution and stabilizes the excited state, allowing effective detection in acidic environments without requiring pH adjustment.
2Measurement precision
If conventional fluorescent indicators are used in acidic samples, then detection of microorganisms is possible, but pH adjustment is required which adds complexity
Solution Approach 1:
The fluorinated 7-hydroxycoumarin compounds are designed to be self-adaptable to acidic conditions without requiring external pH adjustment. The molecular structure inherently provides stability and fluorescence under acidic pH, allowing the detection system to function autonomously in the native sample environment. This eliminates the need for additional pH buffer systems or adjustment protocols, simplifying the overall detection methodology while maintaining measurement precision.
3Illumination intensity
If excitation wavelengths are used for maximum fluorescence, then background interference increases in acidic samples
Solution Approach 1:
The fluorinated coumarin compounds exhibit modified spectral properties with distinct excitation and emission maxima that are optimized for reduced background interference. The fluorine substitution creates a localized electronic environment that shifts the fluorescence spectrum to wavelengths where biological samples have lower endogenous fluorescence. This local quality change in the molecular electronic structure enables selective excitation and emission at wavelengths that minimize background signals from cellular components, enhancing signal-to-noise ratio.
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 fluorinated compounds provide stable and enhanced fluorescence signals in acidic conditions, enabling effective detection of microorganisms without the need for pH adjustment, and are suitable for use with low-cost laser diode light sources.
Implementation Method 1
The umbelliferones are fluorescent but when the 7-hydroxy group is functionalized with an enzyme-labile group, the fluorescence of the resulting compound is quenched. When contacted with an appropriate enzyme, the enzyme-labile group can be released through hydrolysis resulting in the reformation of the 7-hydroxy group and restoration of fluorescence.
Implementation Method 2
When contacted with an appropriate enzyme, the enzyme-labile group can be released through hydrolysis resulting in the reformation of the 7-hydroxy group and restoration of fluorescence.
Implementation Method 3
Compounds are provided that are either (a) fluorescent under acidic conditions or (b) fluorescent under acidic conditions after exposure to an enzyme that converts an enzyme-labile group to a hydroxyl group... utilizing excitation wavelengths around 400 nanometers for reduced background interference.
Data Source
AI summary
Compounds are provided that are either fluorogenic or fluorophoric. Compositions and articles that include the compounds are also provided. Additionally, methods of detecting a microorganism using the compounds are provided. The compounds are fluorinated and can be used advantageously under acidic conditions.