Aspergillus flavus metabolome extraction using cold glycerol quenching
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Solution Overview
Problem
Current methods for detecting the metabolome of Aspergillus flavus are inadequate, leading to poor coverage and failure to detect low-level metabolic compounds and important markers, due to inefficient pretreatment processes that affect the accuracy and stability of analysis results.
Innovation Solution
A pretreatment method involving culturing Aspergillus flavus, quenching with a cold glycerol buffer solution, rapid filtration, freeze-drying, and ultrasonic disruption for metabolome extraction, followed by LC-MS analysis using a specific solvent mixture and optimized conditions to ensure accurate and comprehensive metabolome detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional pretreatment methods are used for metabolome detection, then the detection process is simple, but the coverage of metabolome compounds is poor and low-level metabolic compounds are not detected
Solution Approach 1:
The pretreatment process is divided into multiple sequential steps: quenching with cold glycerol buffer solution, rapid filtration, freeze-drying, and ultrasonic disruption with specific solvent mixtures. Each step targets specific metabolite classes, collectively achieving comprehensive coverage without requiring overly complex individual operations
Solution Approach 2:
Multiple solvent systems are used in combination: cold glycerol buffer solution for quenching, methanol-chloroform for initial extraction, and methanol-acetonitrile-water for final extraction. This composite approach allows simultaneous extraction of diverse metabolite types (polar, non-polar, and intermediate) that single solvents cannot achieve
2Reliability
If conventional quenching methods are used, then the process is quick, but enzyme activity is not effectively stopped and metabolome accuracy is reduced
Solution Approach 1:
Cold glycerol buffer solution is prepared in advance and immediately applied to the sample upon collection. The pre-cooled solution instantly quenches enzyme activity upon contact, preventing metabolic changes during the transition from sample collection to processing
Solution Approach 2:
The sample undergoes rapid phase transition from liquid suspension to frozen state through freeze-drying after quenching. This phase change locks metabolites in their native state, preserving the metabolic snapshot while the initial quick quenching prevents enzymatic degradation
3Quantity of substance
If traditional extraction methods are used, then the procedure is simple, but polar compounds and important markers are not detected
Solution Approach 1:
Different solvent systems with varying polarity are sequentially applied: methanol-chloroform (less polar) followed by methanol-acetonitrile-water (more polar). This gradient approach extracts metabolites across the full polarity spectrum, ensuring both polar markers and non-polar compounds are captured
Solution Approach 2:
The cold glycerol buffer solution acts as an intermediary medium during quenching that protects polar metabolites from degradation. Glycerol's hygroscopic nature maintains the hydration shell around polar compounds, preserving their integrity for subsequent extraction
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
This method effectively quenches enzyme activity, maintains cell integrity, and achieves high coverage of metabolome compounds, enhancing the repeatability and accuracy of metabolome analysis, reducing false positives and improving the detection of polar compounds.
Implementation Method 1
a sample of Aspergillus flavus obtained from step (1) is added to a cold glycerol buffer solution quenching agent, rapidly mixed and vortexed, homogenized, then cooled under low temperature conditions
Implementation Method 2
then rapidly filtered a mixture by vacuum filtration, and a solid sample is collected
Implementation Method 3
the solid sample is freeze-dried to obtain a cell sample of Aspergillus flavus
Implementation Method 4
the cell sample of Aspergillus flavus obtained by freeze-drying in step (2) is disrupted and an extraction process is performed
Data Source
AI summary
The invention belongs to the field of chemical analysis and detection, and specifically relates to a pretreatment method for LC-MS detecting metabolomics of Aspergillus flavus. The method includes: culturing a strain of Aspergillus flavus; quenching the Aspergillus flavus; disrupting the cell membrane of Aspergillus flavus, and extracting a metabolome. The invention adopts a cold glycerol buffer solution combined with a rapid filtration method for quenching, and a MeOH/DCM/ACN/EA/HCOOH mixture is used as an metabolome extract, thereby achieving the object of efficiently extracting different polar compounds, and metabolome compound coverage is high; pretreatment of the cell metabolomics of Aspergillus flavus by the method of the invention can ensure the repeatability and stability of the metabolomics analysis method and reduce the false positive of the test results.