Lipid Double Bond Localization via VUV Photon-Induced Fragmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional mass spectrometry methods, such as Collision Induced Dissociation, are unable to provide structural information about the position of unsaturated bonds in lipid molecules, often requiring derivatization and having low efficiency.
Innovation Solution
The method involves ionizing lipid molecules, subjecting them to photon-induced fragmentation, and analyzing the intensity profile of fragment ions to determine the position of unsaturated bonds, which can be achieved without derivatization using a simple and inexpensive UV lamp, resulting in a stochastic fragmentation process that directly probes carbon-carbon bonds along the hydrocarbon chain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If Collision Induced Dissociation is used to ionize and fragment lipid molecules, then the method is simple and widely applicable, but no structural information about the position of unsaturated bonds is obtained
Solution Approach 1:
The patent changes the fragmentation mechanism from collision-induced to photon-induced by using VUV radiation at 100-200 nm. This parameter change in the energy input method enables direct C-C bond cleavage and produces a characteristic fragment ion envelope that reveals unsaturated bond positions, resolving the information loss problem without requiring complex derivatization procedures
Solution Approach 2:
The patent replaces the mechanical collision-based fragmentation system with a photonic system using vacuum ultraviolet radiation. This substitution enables direct probing of carbon-carbon bonds through photon-induced electron detachment and subsequent fragmentation, providing structural information about unsaturated bonds that was inaccessible through conventional mechanical CID methods
2Loss of information
If derivatization is performed to determine unsaturated bond positions, then structural information can be obtained, but the process becomes more complex and time-consuming
Solution Approach 1:
The patent enables the lipid molecules to self-reveal their unsaturated bond positions through direct VUV photon-induced fragmentation without requiring external derivatization agents or chemical modifications. The characteristic fragment ion envelope is generated directly from the native lipid structure, eliminating time-consuming derivatization steps while preserving structural information
Solution Approach 2:
The patent extracts the structural information about unsaturated bond positions directly from the fragmentation pattern of native lipid molecules. By analyzing the characteristic fragment ion envelope produced through VUV irradiation, the position of unsaturated bonds is determined without extracting or modifying the lipid structure through derivatization, thus saving time and simplifying the process
3Loss of information
If conventional CID methods are used, then the analysis is fast and efficient, but no information about carbon-carbon bond cleavage positions is provided
Solution Approach 1:
The patent changes the fundamental parameter of energy input from collisional to photonic, using VUV radiation at 100-200 nm to induce electron detachment and subsequent fragmentation. This parameter change enables direct C-C bond cleavage information to be obtained through the characteristic fragment ion envelope, maintaining analytical speed while providing previously inaccessible structural information about unsaturated bond positions
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 approach allows for the accurate localization of unsaturated bonds in lipid molecules by analyzing the intensity profile of fragment ions, providing structural information not available through conventional methods, and offering higher efficiency and cost-effectiveness.
Implementation Method 1
subjecting the lipid parent ions to photon-induced fragmentation in order to cause the lipid parent ions to fragment to form a plurality of fragment or product ions
Implementation Method 2
It is known to use an Electrospray ion source in positive ion mode to ionise lipids and other biomolecules to form [M+H]+ singly charged molecular cations
Data Source
AI summary
A method of mass spectrometry for analyzing lipids and similar biological molecules is disclosed. The lipid molecules may be ionized to form a plurality of lipid parent ions and subjected to photon-induced fragmentation to form a plurality of fragment or product ions. The position of one or more unsaturated bonds in the lipid molecules may be determined by mass analyzing the fragment and product ions and analyzing their intensity profile.