Mass Spectrometry Mass Correction Using Background Ion Libraries
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Solution Overview
Problem
Current chromatographic techniques face challenges in accurately correcting mass-to-charge ratio data due to the variability of background components, which are often unknown and difficult to identify, especially when chromatographic conditions change, leading to difficulties in resolving analyte components.
Innovation Solution
A method involving the creation of a library of measured background component data under various chromatographic conditions, allowing for the identification and correction of background components in subsequent analyses without requiring knowledge of their elemental composition, by comparing physico-chemical properties across retention times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If background component correction is performed using known elemental composition methods, then mass to charge ratio accuracy is improved, but the method fails when background components are unknown or difficult to identify
Solution Approach 1:
The patent performs preliminary measurement and characterization of background components under various chromatographic conditions before actual sample analysis. A library of background component data including mass spectra and retention times is constructed in advance, enabling subsequent correction without requiring knowledge of elemental composition during the analysis phase.
Solution Approach 2:
The patent creates a reference library that copies and stores the characteristics of background components (mass spectra, retention times) under different chromatographic conditions. This library serves as a template for identifying and correcting background components in subsequent analyses by matching observed data against the stored reference data.
2Reliability
If background component data is collected under multiple chromatographic conditions, then correction accuracy across varying conditions is improved, but the complexity of data management and library construction increases
Solution Approach 1:
The patent constructs a universal background component library that stores data under multiple chromatographic conditions, enabling the same library to serve correction purposes across varying analytical conditions. The library is designed to be broadly applicable to different chromatographic methods and instruments, reducing the need for condition-specific corrections.
Solution Approach 2:
The system automatically matches observed background components during analysis against the reference library and performs correction without requiring manual intervention. The automated identification and correction process reduces the operational complexity despite the comprehensive nature of the library.
3Measurement precision
If precise identification of background ions is performed to calculate exact m/z ratios, then mass to charge ratio drift correction is improved, but the method requires knowledge of elemental composition which is often unavailable
Solution Approach 1:
The patent replaces the traditional approach of calculating m/z ratios from elemental composition with an empirical measurement approach. Instead of using theoretical calculations based on known chemistry, the system directly measures the mass spectra of background components under actual chromatographic conditions and uses these measured values for correction.
Solution Approach 2:
The patent changes the approach from using theoretical parameters (elemental composition) to using experimentally determined parameters (measured mass spectra and retention times). This parameter substitution allows the method to work with unknown background components while maintaining correction accuracy.
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 accurate correction of mass spectral data by accounting for background components, improving the resolution and accuracy of analyte component analysis across varying chromatographic conditions, reducing the need for external calibrants and enhancing the reliability of mass spectrometry results.
Implementation Method 1
Chromatographic techniques such as liquid chromatography ('LC') and gas chromatography ('GC') coupled with mass spectrometry are routinely used to analyse samples
Implementation Method 2
chromatographic separation in which a mobile phase moves through a stationary phase
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A method of mass spectrometry comprising the steps of: providing a library of background ion data including m/z data for multiple background ions in respect of different chromatographic conditions including a change of solvent composition from aqueous (1) to organic (3), chromatographically separating a sample containing analyte components, wherein the chromatographic separation is performed under a chromatographic condition in respect of which background ion data is provided in the library, analysing the sample to obtain sample data comprising m/z values for the sample components as a function of retention time (RT), and calculating one or more error values including ppm error as a function of retention time based on a comparison between background ions identified in the sample data and the library of background ion data. Outliers (4), corrupted measurements and inconsistent measurements at specific retention times are rejected.