Reaction Cell Ion Suppression in Mass Spectrometry
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Solution Overview
Problem
Conventional mass spectrometers face challenges in accurately distinguishing analyte ions from interfering ions with the same mass-to-charge ratio, leading to inaccurate measurements due to spectral interferences.
Innovation Solution
A system is configured with a mass analyzer positioned upstream of a cell, where the mass analyzer selects native ions with a single mass-to-charge ratio, and the cell, configured as a reaction or collision cell, removes interfering ions by reacting or colliding them with a gas, allowing only the analyte ions to pass through to the detector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single mass analyzer is used, then device complexity is reduced, but the ability to remove interfering ions with the same mass-to-charge ratio is insufficient
Solution Approach 1:
The system divides the ion processing function into two distinct stages: first, the mass analyzer separates ions by mass-to-charge ratio; second, the reaction cell performs chemical reactions to remove interfering ions that have the same mass-to-charge ratio as analyte ions. This segmentation allows each component to specialize in one function, achieving high precision without requiring multiple mass analyzers.
Solution Approach 2:
A reaction cell is introduced as an intermediary component between the mass analyzer and detector. This reaction cell uses chemical reactions (such as charge exchange or dissociation) to transform interfering ions into different species that can then be removed by the mass analyzer, effectively solving the problem of isobaric interferences without adding another mass analyzer.
2Measurement precision
If conventional mass spectrometers are used, then measurement of analyte ions is possible, but spectral interferences from ions with the same mass-to-charge ratio lead to inaccurate measurements
Solution Approach 1:
The system performs preliminary chemical reactions in the reaction cell before detection to remove interfering ions. By pre-treating the ion beam through chemical reactions that selectively affect interfering ions (such as charge exchange reactions that change the mass-to-charge ratio of interfering ions), the system eliminates spectral interferences before they reach the detector, ensuring accurate measurement of analyte ions.
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 configuration enables precise and accurate measurement of analyte ions by eliminating interfering species, similar to triple quad devices but with a simpler design and lower costs, reducing the need for additional mass analyzers and infrastructure.
Implementation Method 1
the cell, configured as a reaction or collision cell, removes interfering ions by reacting or colliding them with a gas
Implementation Method 2
the cell, configured as a reaction or collision cell, removes interfering ions by reacting or colliding them with a gas
Implementation Method 3
Mass spectrometry separates species based on differences in mass-to-charge ratios
Data Source
AI summary
Certain embodiments described herein are directed to systems including a cell downstream of a mass analyzer. In some instances, the cell is configured as a reaction cell, a collision cell or a reaction/collision cell. The system can be used to suppress unwanted ions and/or remove interfering ions from a stream comprising a plurality of ions.