High M/Z Cutoff Mass Filtering for Cleaner Food Sample Analysis
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Solution Overview
Problem
Mass spectrometric methods for analyzing food-based samples often result in complex matrices that contaminate the mass spectrometer system, leading to performance degradation and increased maintenance costs due to charge build-up, particularly in systems with low entrance ion energies.
Innovation Solution
Implementing a mass filter with a high m/z cutoff greater than the maximum m/z ratio of ions associated with analytes of interest to inhibit the passage of contaminating ions, thereby reducing contamination of the downstream mass analyzer and allowing target ions to pass through, using a quadrupole or time-of-flight mass analyzer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mass spectrometer is used to analyze food-based samples with complex matrices, then the detection of analytes is achieved, but the mass analyzer becomes contaminated leading to performance degradation and frequent cleaning requirements
Solution Approach 1:
A mass filter is introduced as an intermediary component between the ion source and the mass analyzer. This mass filter selectively transmits ions within a specific m/z range while blocking higher m/z ions that would otherwise contaminate the mass analyzer, thereby protecting the analyzer from contamination while allowing analyte ions to pass through
Solution Approach 2:
The mass filter is configured with specific transmission parameters (m/z range) that change based on the analyte requirements. By adjusting the mass filter transmission window to match the m/z range of analytes of interest, the system allows analyte ions to pass while blocking contaminating ions with higher m/z ratios
2Object-generated harmful factors
If the mass filter is configured with a high m/z cutoff to block contaminating ions, then contamination is reduced, but the ability to detect analytes with higher m/z ratios is limited
Solution Approach 1:
The mass filter transmission window is made dynamically adjustable rather than fixed. The system can adapt the m/z transmission range based on the specific analyte being analyzed, allowing the high m/z cutoff to be optimized for each analytical application. This dynamic configuration enables the system to block contaminants while maintaining the ability to detect analytes across different m/z ranges
3Reliability
If periodic cleaning of the mass analyzer is performed to maintain performance, then contamination is removed, but the workflow efficiency decreases and operating costs increase
Solution Approach 1:
The mass filter performs preliminary filtering of ions before they reach the mass analyzer, preventing contamination in the first place rather than requiring subsequent cleaning operations. This proactive approach maintains mass analyzer performance over extended periods without interrupting the analytical workflow for maintenance
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 extends the cleaning interval of the mass spectrometer, maintaining performance and reducing contamination, as demonstrated by a three-fold extension in the experiments with food-based samples like tea and arugula, where high m/z cutoffs effectively deposited debris on upstream components rather than the primary mass analyzer.
Implementation Method 1
a mass filter is configured to provide a high m/z cutoff greater than a maximum m/z ratio of ions associated with one or more analytes of interest in the sample so as to allow passage of the analyte ions while inhibiting passage of ions having m/z ratios above the high m/z cutoff
Data Source
AI summary
In one aspect, a method of performing mass spectrometric analysis of a sample, e.g. a food-based sample, is disclosed, which comprises ionizing the sample to generate a plurality of ions, introducing the plurality of ions into a mass filter configured to provide a high m/z cutoff greater than a maximum m/z ratio of ions associated with one or more analytes of interest in the sample so as to allow passage of the analyte ions while inhibiting passage of ions having m/z ratios above said high m/z cutoff, and performing a mass analysis of ions passing through said mass filter. In a related aspect, a mass spectrometer is disclosed, which comprises an atmospheric pressure ion source, a first mass filter, a user interface and a controller.