Ion Mobility Gas Composition Control for Multi-Analyte Separation
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Solution Overview
Problem
Conventional mass spectrometry and ion mobility spectrometry face limitations in optimizing conditions for multiple targeted ions during experiments, as existing methods can only optimize for a proportion of ions at any given time due to static gas composition in ion mobility separation devices.
Innovation Solution
Dynamic variation of gas composition within ion mobility separation devices based on the elution time of ions or molecules from upstream devices, allowing for optimal separation conditions to be set for multiple analytes by changing the proportions of gases or pressure over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the gas composition in the ion mobility separation device is maintained static during the experiment, then the device complexity is reduced and operation is simplified, but the resolution and detection limits for multiple analyte ions cannot be optimized
Solution Approach 1:
The gas composition in the ion mobility separation device is dynamically varied during the chromatographic separation process. The controller adjusts the proportions of different gases in the buffer gas mixture in real-time based on the elution time of different analyte ions, allowing optimization of ion mobility separation conditions for multiple targeted ions throughout the experiment.
Solution Approach 2:
The composition parameters of the buffer gas are changed during the experiment to optimize separation conditions. By varying the gas composition (e.g., ratios of nitrogen, carbon dioxide, and other gases), the ion mobility characteristics are tuned to achieve optimal resolution for different analyte ions at different time points.
2Measurement precision
If the gas composition is optimized for one analyte ion, then the separation conditions are optimal for that ion, but the conditions become non-optimal for other analyte ions eluting at different times
Solution Approach 1:
The system dynamically adapts the gas composition throughout the chromatographic run. The controller varies the gas mixture ratios in real-time to match the elution profile of different analyte ions, ensuring that optimal ion mobility separation conditions are maintained for each targeted ion as it elutes from the chromatograph.
Solution Approach 2:
The controller is pre-programmed with the optimal gas composition settings for each targeted analyte ion based on their expected elution times. This allows the system to proactively adjust the gas composition in anticipation of which ions will be present, optimizing separation conditions before each analyte reaches the detector.
3Measurement precision
If a static gas composition is used, then the experimental procedure is simpler and faster to implement, but only a compromise optimization can be achieved for multiple ions
Solution Approach 1:
The system uses feedback from the chromatographic separation process to control gas composition adjustments. The controller monitors the elution profile and automatically adjusts the gas mixture ratios to maintain optimal ion mobility separation conditions, eliminating the need for manual optimization and reducing setup time while improving detection limits.
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 enhances the resolution and detection limits of mass spectrometry by optimizing ion mobility separation conditions for multiple analytes simultaneously, improving the separation and quantification of target ions by adjusting gas composition in real-time.
Implementation Method 1
Ions may be separated according to their ion mobility by virtue of their different interactions with a buffer gas under the influence of an applied electric field
Implementation Method 2
The nature of the interaction between the analyte ions and the gas determines the collision cross-section and hence the measured drift time of ions through an IMS device
Data Source
Figure 1
AI summary
A mass spectrometer or ion mobility spectrometer is disclosed comprising: a first device for separating ions or molecules according to a physicochemical property (3); an ion mobility separation device (4) for receiving and separating at least some of said ions or ions derived from said molecules according to their ion mobility; a gas supply (6-10) connected to said ion mobility separation device (4) for supplying gas into said ion mobility separation device (4); and a control system (11) configured to adjust said gas supply (6-10) so as to change the composition of gas within the ion mobility separation device (4) as a function of time.