Ion Trap Mass Spectrometry for 2D Analysis
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Solution Overview
Problem
The development of two-dimensional mass spectrometry techniques is hindered by the high cost and maintenance requirements of Fourier Transform Ion Cyclotron Resonance (FT-ICR) instruments, and the lengthy duty cycle of these instruments, which limits the application of 2D MS to other mass spectrometers and complicates the analysis of complex samples.
Innovation Solution
The implementation of two-dimensional mass spectrometry using an electrostatic or electrodynamic ion trap, where ions are modulated in a mass-to-charge ratio-dependent fashion, allowing for radius-dependent fragmentation and the generation of mass spectra that correlate precursor and fragment ions, potentially enabling faster analysis and compatibility with liquid chromatography or gas chromatography timescales.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If FT-ICR instruments are used for two-dimensional mass spectrometry, then comprehensive fragmentation pattern analysis is achieved, but the instrument cost and maintenance requirements increase significantly
Solution Approach 1:
The patent replaces expensive FT-ICR instruments with more affordable ion trap or quadrupole mass spectrometers. While these instruments have different operational characteristics, they can still perform 2D MS experiments through alternative methodologies, making the technique accessible to more laboratories without sacrificing the core analytical capability of comprehensive fragmentation pattern analysis
Solution Approach 2:
The patent modifies the experimental parameters and pulse sequences to be compatible with ion trap and quadrupole instruments rather than FT-ICR. This involves adapting the excitation and detection methods to match the resonant characteristics and operational modes of these more affordable instrument types, enabling 2D MS on cost-effective platforms
2Measurement precision
If FT-ICR instruments are used for two-dimensional mass spectrometry, then comprehensive sample analysis is achieved, but the duty cycle becomes excessively long
Solution Approach 1:
The patent employs ion trap and quadrupole mass spectrometers which have significantly faster duty cycles compared to FT-ICR instruments. These instruments can perform 2D MS experiments much more quickly, enabling analysis on liquid chromatography timescales and improving throughput while maintaining the comprehensive sample analysis capability through adapted experimental methodologies
3Productivity
If ion trap instruments are used instead of FT-ICR, then analysis speed increases, but vacuum requirements become less stringent
Solution Approach 1:
The patent adjusts the experimental parameters and data processing methods to account for the different vacuum conditions in ion trap instruments. By modifying the pulse sequences, excitation schemes, and detection parameters, the methodology maintains effectiveness despite the less stringent vacuum requirements, enabling faster analysis while accommodating the operational characteristics of ion trap instruments
4Measurement precision
If radius-dependent fragmentation is implemented, then precursor-fragment ion correlation is achieved, but the instrumentation requirements become more complex
Solution Approach 1:
The patent segments the mass spectrum into multiple two-dimensional spectra by applying selective resonant excitation at different frequencies. Each frequency targets ions of a specific mass-to-charge ratio, causing them to oscillate and fragment in a controlled manner. This segmentation approach enables precise precursor-fragment ion correlation while using standard ion trap or quadrupole instrumentation without requiring additional complex components
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 quicker 2D MS analysis compared to FT-ICR instruments, reduces the stringent vacuum requirements, and enables the use of less expensive and more tolerant ion traps, facilitating the analysis of complex samples on faster chromatographic timescales.
Implementation Method 1
using an electrostatic or electrodynamic ion trap to contain a plurality of ions
Implementation Method 2
using an electrostatic or electrodynamic ion trap to contain a plurality of ions
Implementation Method 3
modulating the radii of the ions in a mass to charge ratio-dependent fashion dependent upon the mass to charge ratio
Implementation Method 4
modulating the radii of the ions in a mass to charge ratio-dependent fashion dependent upon the mass to charge ratio
Implementation Method 5
fragmenting the ions thus modulated in a radius-dependent fashion
Data Source
AI summary
A method of carrying out mass spectrometry, comprising: using an electrostatic or electrodynamic ion trap to contain a plurality of ions, each ion having a mass to charge ratio, the ions having a first plurality of mass to charge ratios, each ion following a path within the electrostatic or electrodynamic ion trap having a radius; and for each of a second plurality of the mass to charge ratios: modulating the radii of the ions in a mass to charge ratio-dependent fashion dependent upon the mass to charge ratio; fragmenting the ions thus modulated in a radius-dependent fashion; and determining a mass spectrum of the ions.