Product Ion Filtering for Specific Precursor Association
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Solution Overview
Problem
Current mass spectrometry methods face challenges in assigning precursor ions to product ions with high specificity, especially in complex mixtures, due to low peak capacity and resolution in liquid chromatographic separation, leading to inefficient data processing and analysis.
Innovation Solution
The method filters product ions to only transmit those that could theoretically result from a specific modification of interest, by adjusting mass to charge ratios and ion mobilities, thereby simplifying data comparison and reducing unnecessary data processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all product ions are transmitted and analyzed without filtering, then complete spectral data is obtained for comprehensive analysis, but data processing complexity and storage requirements increase significantly
Solution Approach 1:
The patent applies preliminary action by performing mass filtering of product ions before detection and analysis. The mass filter is configured to transmit only product ions within a specific mass-to-charge ratio range that corresponds to the modification of interest, thereby pre-processing the ion population to eliminate irrelevant ions before they enter the detection and data processing stages. This reduces the complexity of subsequent data processing while maintaining reliability for the specific modification being investigated.
Solution Approach 2:
The patent extracts only the relevant subset of product ions that correspond to the modification of interest by using a mass filter. Instead of analyzing all product ions, the system selectively transmits and detects only those ions whose mass-to-charge ratios match the expected values for the modification being studied, thereby separating useful information from unnecessary data and reducing processing burden.
2Measurement precision
If ion mobility data is retained for all product ions, then comprehensive identification information is available, but data storage and transmission requirements increase
Solution Approach 1:
The patent extracts and retains ion mobility data only for product ions that pass through the mass filter and correspond to the modification of interest. By combining mass filtering with selective ion mobility data retention, the system maintains sufficient identification accuracy for the relevant ions while discarding data for irrelevant ions, thereby reducing overall data storage and transmission requirements without compromising the precision needed for identifying the modification.
3Productivity
If liquid chromatographic separation is used alone, then separation of mixture components is achieved, but peak capacity and resolution are insufficient for complex mixtures
Solution Approach 1:
The patent merges liquid chromatographic separation with ion mobility separation and mass filtering to create a multi-dimensional separation system. The ion mobility separator provides an additional separation dimension based on ion size and shape, while the mass filter provides selective transmission based on mass-to-charge ratio. This combination of multiple separation mechanisms significantly increases peak capacity and resolution for complex mixtures, allowing better discrimination of co-eluting ions that liquid chromatography alone cannot resolve.
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 significantly enhances the specificity of precursor ion to product ion assignment, reduces data storage and processing, and simplifies the identification of relevant precursor ions by filtering out irrelevant product ions, improving the efficiency of mass spectrometry analysis.
Implementation Method 1
transmitting the separated product ions to the mass filter and varying the mass to charge ratios transmitted by the mass filter with time
Implementation Method 2
separating precursor ions according to ion mobility
Implementation Method 3
subjecting the separated precursor ions to a fragmentation or reaction condition so as to produce product ions
Data Source
Figure 1~2
AI summary
A method of mass spectrometry is disclosed comprising selecting a modification of interest that may modify the mass to charge ratios of precursor ions of interest when said precursor ions are subjected to a fragmentation or reaction condition for producing product ions. The method then filters the product ions (or product ion data) such that only a subset of the product ions are transmitted and detected (or a subset of the data remains) and so as to exclude product ions (or product ion data) that could not have possibly resulted from the modification of interest. This significantly simplifies the product ion data, enabling the product ions to be identified or compared to precursor ion spectra more efficiently.