Mass Spectrometry Fragment Ion Identification via Differential Spectrum Subtraction
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Solution Overview
Problem
Current mass spectrometry methods face challenges in effectively analyzing and distinguishing between parent and fragment ions, particularly in identifying noise and enhancing signal clarity for fragment ions of interest, which hinders the accurate detection of neutral loss reaction pairs.
Innovation Solution
A method involving a mass analysis system that performs low and high fragmentation scans, subtracts the low fragmentation spectrum from the high fragmentation spectrum to obtain a differential spectrum, shifts and multiplies it by a selected neutral loss to align and amplify fragment ion signals, thereby reducing noise and improving the identification of parent/fragment pairs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional mass spectrometry methods are used to analyze parent and fragment ions, then the analysis can be performed with standard equipment, but the noise in the mass spectra reduces the clarity and detectability of fragment ion signals
Solution Approach 1:
The patent extracts and removes the low fragmentation spectrum from the high fragmentation spectrum through subtraction, isolating the fragment ion signals from the background noise and parent ion signals. This extraction process separates the useful fragment ion information from the harmful noise, significantly improving signal clarity and detectability.
Solution Approach 2:
The patent performs preliminary processing by acquiring a low fragmentation spectrum before the high fragmentation spectrum and using it to subtract background noise and parent ion signals from the high fragmentation spectrum. This preliminary action prepares the data by removing interfering signals before the actual fragment ion analysis, enhancing the clarity of fragment ion signals.
2Measurement precision
If high fragmentation scans are performed to enhance fragment ion signals, then the detectability of fragment ions improves, but the parent ion signals and background noise also increase
Solution Approach 1:
The patent extracts and removes the low fragmentation spectrum (containing parent ion signals and background noise) from the high fragmentation spectrum through subtraction. This extraction process isolates the fragment ion signals by removing the unwanted parent ion signals and background noise that accompany high fragmentation scans.
Solution Approach 2:
The patent uses the low fragmentation spectrum as an intermediary to mediate the analysis of the high fragmentation spectrum. By subtracting the low fragmentation spectrum from the high fragmentation spectrum, the low fragmentation spectrum acts as a mediator that removes parent ion signals and background noise, allowing clear detection of fragment ions without the interference of excessive parent ion signals.
3Productivity
If neutral loss reaction pairs are identified using correlation methods, then the identification of reaction pairs can be achieved, but the accuracy is reduced by noise and overlapping signals in the mass spectra
Solution Approach 1:
The patent performs preliminary subtraction of the low fragmentation spectrum from the high fragmentation spectrum to remove background noise and parent ion signals before conducting correlation analysis. This preliminary action cleans the data by removing interfering signals that would otherwise reduce the accuracy of reaction pair identification, enabling more accurate detection of neutral loss reaction pairs.
Solution Approach 2:
The patent extracts and removes the interfering low fragmentation spectrum from the high fragmentation spectrum, isolating the fragment ion signals associated with neutral loss reactions. This extraction process eliminates background noise and parent ion signals that would interfere with the correlation analysis, significantly improving the accuracy of reaction pair identification.
Data Source
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AI summary
A first mass spectrum and a second mass spectrum of the same ion sample can be analyzed to determine reaction pairs. These reaction pairs are determined based on a selected neutral difference by shifting the second mass spectrum by the neutral difference relative to the first mass spectrum to provide a shifted mass spectrum. Then, the shifted mass spectrum is compared with the first mass spectrum of the ion sample to determine the reaction pairs based on the neutral difference.