Electron Transfer Dissociation Reagent Ion Generation
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Solution Overview
Problem
Current Electron Transfer Dissociation (ETD) methods face challenges in generating high charge state reagent ions with a large reaction cross-section and are limited to a small subset of compounds, making it difficult to resolve highly charged fragment ions and preserve post-translational modifications during mass spectrometry.
Innovation Solution
The method involves subjecting primary ions to an electron detachment, capture, or transfer process to form secondary ions with a different charge state, which are then interacted with analyte ions to fragment them, using processes such as Electron Photo Detachment, Electron Detachment, Electron Capture, or Electron Transfer, to produce multiply charged ETD reagent ions from a variety of compound classes and ionization methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Electron Capture Dissociation (ECD) is used to fragment peptide ions, then Post Translational Modifications (PTMs) are preserved, but the equipment becomes very large and prohibitively expensive
Solution Approach 1:
The patent introduces an intermediary substance (reagent gas such as SF6, CF4, or CCl4) that mediates the electron transfer process. Instead of directly confining thermal electrons and positive ions as in ECD, the reagent gas molecules act as intermediaries that capture electrons and subsequently transfer them to the analyte ions, achieving ECD-like fragmentation without requiring superconducting magnets or large magnetic fields
Solution Approach 2:
The patent replaces the mechanical/magnetic field-based electron confinement system of ECD (requiring superconducting magnets) with a chemical-based electron transfer system using reagent gases. This substitution eliminates the need for complex magnetic field generation and maintenance infrastructure, dramatically reducing equipment size and cost while preserving the beneficial fragmentation characteristics
2Ease of operation
If singly charged reagent ions are used in Electron Transfer Dissociation (ETD), then the process is simpler to implement, but the reaction cross-section is small and efficiency is reduced
Solution Approach 1:
The patent changes the charge state parameter of the reagent ions from singly charged to multiply charged (e.g., doubly or triply charged). This parameter change increases the reaction cross-section and efficiency of the ETD process, as multiply charged reagent ions have greater electron affinity and can transfer electrons more effectively to multiply charged analyte ions, while still maintaining relative operational simplicity through the use of standard ionization techniques
3Reliability
If a small subset of compounds is used to generate reagent ions, then the ionization process is more controlled, but the range of usable compounds is limited
Solution Approach 1:
The patent identifies reagent gas molecules (such as SF6, CF4, CCl4, and other halogen-containing compounds) that can serve as universal electron acceptors and transfer agents across a wide variety of analyte types. These reagent gases provide a multi-functional platform that works with peptides, proteins, and other biomolecules, significantly expanding the range of usable compounds while maintaining controlled and reliable ionization through consistent electron transfer mechanisms
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 enhances the efficiency of the ETD process by generating multiply charged reagent ions, increasing the range of usable compounds and improving the identification of post-translational modifications, while reducing the complexity of resolving highly charged fragment ions.
Implementation Method 1
subjecting first ions having a charge state m to an electron detachment, electron capture or electron transfer process to form second ions having a charge state n
Implementation Method 2
subjecting first ions having a charge state m to an electron detachment, electron capture or electron transfer process to form second ions having a charge state n
Implementation Method 3
subjecting first ions having a charge state m to an electron detachment, electron capture or electron transfer process to form second ions having a charge state n
Implementation Method 4
causing at least some of the second ions to interact with analyte ions so as to cause at least some of the analyte ions to fragment in order to form daughter, fragment or product ions
Data Source
AI summary
A method of mass spectrometry is disclosed wherein ions are subjected to an electron detachment, electron capture or electron transfer process in order to form ions having a different charge state. At least some of the ions having a different charge state are caused to interact with analyte ions to cause at least some of the analyte ions to fragment to form daughter, fragment or product ions.