Biological Sample Processing with Dual LC and Tandem MS
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Solution Overview
Problem
Existing metabolomics methods struggle with unambiguous identification and quantification of metabolites, particularly in complex health conditions like hypertensive disorders of pregnancy, due to isomer ambiguity and limited mass spectrometer accuracy, necessitating improved analytical technologies for precise and cost-effective multi-variable prognostic tests.
Innovation Solution
A dual chromatography approach combined with tandem mass spectrometry, using liquid chromatography (LC) to separate hydrophobic and hydrophilic metabolites, and targeted tandem MS for specific ion pair identification, along with a metabolite extraction solvent and volumetric absorptive microsampling, enables accurate resolution and quantification of closely related metabolites.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mass-based search is used for metabolite identification, then identification speed is improved, but measurement precision deteriorates due to isomer ambiguity and limited mass spectrometer accuracy
Solution Approach 1:
The patent segments the identification process into multiple stages: initial mass-based screening followed by targeted tandem MS verification. This segmentation allows rapid initial filtering while maintaining high precision through subsequent specialized analysis of candidate metabolites.
Solution Approach 2:
The patent introduces an intermediary verification step using targeted tandem mass spectrometry between the initial mass-based search and final identification. This intermediary layer resolves ambiguities from isomers and compositional variations that the initial mass search cannot distinguish.
2Adaptability or versatility
If untargeted discovery studies are performed, then comprehensive metabolite coverage is improved, but measurement precision deteriorates due to compound ambiguity
Solution Approach 1:
The patent divides the analysis into untargeted discovery phase for comprehensive coverage and targeted verification phase for precision. This segmentation enables the system to maintain broad metabolite coverage while achieving high identification accuracy through focused follow-up analysis.
Solution Approach 2:
The patent performs preliminary untargeted metabolite profiling to identify candidate metabolites of interest, then applies targeted tandem MS analysis in a subsequent action. This preliminary action enables comprehensive screening while the follow-up targeted analysis ensures precise identification.
3Ease of operation
If compound-class centric approaches are used, then analysis simplicity is improved, but adaptability deteriorates when combining metabolites from different compound classes
Solution Approach 1:
The patent employs a universal analytical framework using liquid chromatography-tandem mass spectrometry that can handle multiple compound classes (amino acids, organic acids, lipids, etc.) through a single integrated system, enabling both simple operation and broad adaptability.
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 achieves high-throughput, precise, and robust metabolite profiling, resolving and quantifying closely related metabolites like 2-HBA and 3-HBA, leucine, and sphingosine-1-phosphate, enhancing the specificity and accuracy of disease prediction, especially for preeclampsia, prior to symptom onset.
Implementation Method 1
treating the pre-treated sample by liquid chromatography (LC) to provide a mass spectrometry compatible eluent containing resolved metabolites
Implementation Method 2
pre-treating the biological sample by precipitation with a metabolite extraction solvent or/and by solid phase extraction to provide a pre-treated sample
Implementation Method 3
pre-treating the biological sample by precipitation with a metabolite extraction solvent or/and by solid phase extraction
Implementation Method 4
assaying the eluent using tandem mass spectrometry
Data Source
AI summary
A method of preparing a mass spectrometry compatible eluent containing multiple metabolites is described. The method comprises the steps of providing an absorptive sampling device comprising a biological sample absorbed on an absorptive medium; extracting the biological sample from the absorptive sampling device into a metabolite extraction solvent to provide a mixture; separating a metabolite rich supernatant from the mixture; and performing a liquid chromatography (LC) step on the metabolite rich supernatant to provide a mass spectrometry compatible eluent containing multiple metabolites.