Modulated Ion Intensity Correlation for Mass Spectrometry
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Solution Overview
Problem
Mass spectrometry faces challenges in analyzing complex mixtures and distinguishing substructures due to limitations in current separation techniques, which result in reduced sample throughput and loss of structural information, especially when trying to associate precursor and product ions.
Innovation Solution
The method involves generating precursor ions, transmitting them into a collision cell to produce product ions, and applying modulation to the ion intensities to identify correlations or anti-correlations, using parameters like declustering potential and collision energy to analyze intensity profiles and associate precursor and product ions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If chromatographic separation techniques (LCMS, GCMS) are used to reduce mixture complexity, then the ability to analyze related ions is improved, but the analysis time increases and sample throughput decreases
Solution Approach 1:
The patent modulates ion transmission parameters (such as ion mobility, mass-to-charge ratio, or arrival time) to create distinct intensity profiles for different ion types. By changing these parameters dynamically during analysis, the system can separate and identify related ions without requiring time-consuming chromatographic separation, thus maintaining high sample throughput while improving the ability to analyze related ions.
Solution Approach 2:
The system applies periodic modulation to ion intensities based on their transmission parameters, creating correlated intensity patterns that encode ion identity information. This periodic modulation allows the system to distinguish related ions through pattern recognition rather than physical separation, eliminating the need for slow chromatographic processes while preserving ion relationship information.
2Productivity
If all ionized species are fragmented simultaneously to increase throughput, then analysis time is reduced, but the ability to associate fragment and precursor ions is lost
Solution Approach 1:
The system uses the modulated intensity profiles as feedback to associate precursor and product ions. By monitoring how ion intensities correlate across different modulation phases, the system can retrospectively link fragments to their precursors even when all ions are processed simultaneously, thus maintaining structural information while achieving high throughput.
Solution Approach 2:
The modulation parameter acts as an intermediary that encodes ion identity information into intensity patterns. This intermediary allows the system to maintain ion-fragment relationships without requiring sequential processing, as the modulation pattern serves as a unique identifier that links precursors to their products across the simultaneous analysis.
3Measurement precision
If MS3 analysis is performed to distinguish substructures with same mass, then structural resolution is improved, but additional time is required for multiple fragmentation steps
Solution Approach 1:
The system performs preliminary modulation of ion intensities based on transmission parameters before fragmentation occurs. This preliminary encoding of ion identity information allows the system to rapidly distinguish substructures through pattern recognition rather than requiring multiple sequential fragmentation steps, achieving high structural resolution in a single pass.
Solution Approach 2:
Instead of resolving substructures through additional fragmentation dimensions (MS3), the system introduces a new dimension of discrimination based on modulated intensity profiles. By analyzing ions in this additional parameter space rather than solely through mass spectral fragmentation, the system achieves superior structural resolution faster than traditional multi-stage MS approaches.
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 enables high-throughput analysis of complex samples with improved compound coverage by correlating precursor and product ions, maintaining structural information and reducing analysis time.
Implementation Method 1
transmitting the precursor ions into a collision cell; generating product ions in the collision cell
Implementation Method 2
applying modulation to one or more of the precursor ion intensity and the product ion intensity; identifying precursor ion and product ion relationships by analyzing intensity profiles defined by the modulation
Data Source
AI summary
A method is provided for mass spectrometry. The method includes generating precursor ions from a sample; transmitting the precursor ions into a collision cell; generating product ions in the collision cell; detecting the precursor and product ions; applying modulation to one or more of the precursor ion intensity and the product ion intensity; and identifying precursor ion and product ion relationships by analyzing intensity profiles defined by the modulation.