Chlorinated Alkylumbelliferyl Substrate for Sterilization Fluorescence
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Solution Overview
Problem
Current biological sterilization indicators, such as those using 4′-methylumbelliferyl-α-D-glucopyranoside, have limitations in fluorescence intensity at high and low spore levels, particularly in the presence of Geobacillus stearothermophilus spores, and are not optimal across a wide pH range, which affects the accuracy and speed of sterilization efficacy assessment.
Innovation Solution
The use of chlorinated 4′-alkylumbelliferyl α-D-glucopyranosides, which are easily prepared and exhibit enhanced fluorescence yield at various spore levels and pH conditions, serving as enzyme substrates that react with Geobacillus stearothermophilus to generate highly fluorescent compounds, facilitating rapid detection of sterilization efficacy through fluorescence spectroscopy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If 4′-methylumbelliferyl-α-D-glucopyranoside is used as the enzyme substrate, then the sterilization efficacy can be assessed, but the fluorescence intensity is insufficient at high and low spore levels
Solution Approach 1:
The patent modifies the enzyme substrate by introducing a chlorinated alkyl group at the 4′ position of the umbelliferone moiety, changing the chemical structure to chlorinated 4′-alkylumbelliferyl-α-D-glucopyranoside. This structural parameter change results in enhanced fluorescence intensity while maintaining enzymatic activity, thereby improving detection accuracy across different spore levels
Solution Approach 2:
The invention creates a composite substrate molecule combining chlorinated alkyl groups with the umbelliferyl glucopyranoside structure. This composite molecular design integrates the fluorescent properties of umbelliferone with the enzymatic substrate functionality, achieving both high fluorescence yield and reliable detection across the full range of spore concentrations
2Adaptability or versatility
If traditional enzyme substrates are used, then the sterilization process can be monitored, but the performance is not optimal across a wide pH range
Solution Approach 1:
The patent modifies the substrate's chemical structure by introducing electron-withdrawing chlorinated alkyl groups, which changes the electron distribution and stabilizes the fluorescent product across varying pH conditions. This parameter change enables the substrate to maintain optimal performance from pH 6 to pH 9, making it adaptable to different sterilization process conditions
Solution Approach 2:
The chlorinated substrate is designed as a single-use, disposable indicator that maintains its functionality across the required pH range without requiring complex buffering systems or additional stabilizing agents, simplifying the overall system while ensuring consistent performance
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 chlorinated 4′-alkylumbelliferyl α-D-glucopyranosides provide a higher fluorescent signal across a broader pH range and spore concentration spectrum compared to traditional substrates, enabling more accurate and rapid assessment of sterilization processes, including steam and hydrogen peroxide vapor phase sterilization.
Implementation Method 1
a spore-derived enzyme rapidly hydrolyzes the substrate to release the intensely fluorescent molecule
Implementation Method 2
the substrate 4′-methylumbelliferyl-α-D-glucopyranoside is incorporated into a detection medium. Once in contact with the medium, a spore-derived enzyme rapidly hydrolyzes the substrate
Implementation Method 3
Highest fluorescence is observed in its deprotonated anionic form, typically having a greater fluorescence intensity at pH=10 than at a pH of 6-8, when excited at 360 nanometers (nm), with an emission maximum of 455 nm
Data Source
AI summary
A chlorinated 4′-alkylumbelliferyl α-D-glucopy-ranoside represented by the structural formula (I) One of R1 and R2 is Cl and the other is H. R3 represents an alkyl group having 1 to 12 carbon atoms. A method of assessing efficacy of a sterilization process including the same is also disclosed.