Mass Spectrometry Workflow for Selective Ring vs Chain Cleavage
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Solution Overview
Problem
The CID method for metabolome analysis lacks selectivity in dissociation sites, making it difficult to determine whether product ions are generated by ring cleavage or chain cleavage of precursor ions, which is crucial for structural analysis of organic compounds.
Innovation Solution
A mass spectrometry method that acquires product ion spectrum data by both collision-induced dissociation (CID) and hydrogen-attached dissociation (HAD) of precursor ions, allowing for the extraction of product ions with specific mass-to-charge ratio differences to differentiate between cyclic and chain moiety dissociations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If collision-induced dissociation (CID) is used to dissociate precursor ions, then product ions can be generated at various dissociation sites, but the selectivity of dissociation sites is low and it is difficult to obtain information on whether product ions are generated by ring cleavage or chain cleavage
Solution Approach 1:
The patent segments the dissociation process into two distinct methods: CID for comprehensive coverage and HAD for selective ring cleavage. By dividing the analysis into multiple dissociation modes, the system achieves both broad dissociation site coverage and high selectivity for specific structural information.
Solution Approach 2:
Hydrogen radicals serve as an intermediary in the HAD process, mediating the dissociation of precursor ions to produce characteristic product ions from ring cleavage. This intermediary enables selective generation of structural information that cannot be obtained through CID alone.
2Ease of operation
If only CID method is used for metabolome analysis, then the analysis process is simple, but it is difficult to obtain structural information about cyclic vs chain moiety dissociation
Solution Approach 1:
The patent merges CID and HAD methods into a unified analysis workflow. By combining the simplicity of CID with the structural specificity of HAD, the system maintains ease of operation while preventing loss of critical structural information about metabolite cyclic vs chain moieties.
Solution Approach 2:
The system performs preliminary CID analysis to obtain comprehensive product ion data, then follows up with HAD analysis to obtain specific structural information. This preliminary action sequence ensures both operational simplicity and complete structural characterization.
3Measurement precision
If hydrogen radicals are introduced for HAD to achieve selective dissociation, then information on cyclic moiety dissociation can be obtained, but the device complexity increases with additional introducing sections
Solution Approach 1:
The mass spectrometer is designed with multi-functional capability to perform both CID and HAD using the same core dissociation chamber and detection system. This universality allows the system to achieve high dissociation site selectivity without proportionally increasing device complexity, as the same hardware serves multiple analytical functions.
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
Enables accurate estimation of product ion generation sites by identifying specific mass-to-charge ratio differences, improving structural analysis of organic compounds in metabolome studies.
Implementation Method 1
a collision-induced dissociation (CID) method is known in which precursor ions are dissociated by collision of the precursor ions with inert gas molecules such as nitrogen gas
Implementation Method 2
acquiring second product ion spectrum data by dissociating the precursor ion by a reaction of the precursor ion with hydrogen radicals to generate product ions
Data Source
AI summary
First product ion spectrum data is acquired by dissociating a precursor ion derived from a sample component by collision between the precursor ion and an inert gas molecule to generate product ions, and detecting the product ions after separating the product ions according to a mass-to-charge ratio; second product ion spectrum data is acquired by dissociating the precursor ion by a reaction of the precursor ion with hydrogen radicals to generate product ions, and detecting the product ions after separating the product ions according to a mass-to-charge ratio; and a set of product ions having a predetermined mass difference is extracted in the first product ion spectrum data and the second product ion spectrum data.