Ion Mobility Spectrometer Dual Gate for Concurrent Analysis
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Solution Overview
Problem
Dual gate ion mobility spectrometers face limitations in experiment speed due to lengthy mobility scanning, which restricts their adaptability, especially when combined with High Performance Liquid Chromatography (HPLC), and struggle with resolving complex samples where co-eluting components require sequential analysis.
Innovation Solution
Implementing a dynamic waveform for the second ion gate that defines discrete time periods or windows for selective and concurrent transmission of ions in a 'multi gate' mode, allowing multiple ion mobility windows to be processed simultaneously, thereby enhancing the capability for mass analysis and reducing the need for sequential scanning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sequential mobility scanning is used to analyze co-eluting components, then measurement precision is improved, but productivity deteriorates due to lengthy analysis time
Solution Approach 1:
The patent segments the ion mobility spectrum into multiple discrete windows, allowing simultaneous analysis of different mobility regions. Instead of sequentially scanning through each component, the system divides the spectrum into segments (windows) that can be processed concurrently, thereby maintaining resolution while improving throughput.
Solution Approach 2:
The patent introduces a temporal dimension to the analysis by using time-resolved ion detection. Ions are separated in the mobility dimension and then detected at different times corresponding to their drift times. This time dimension allows simultaneous acquisition of multiple mobility windows without sequential scanning, resolving the contradiction between precision and productivity.
2Measurement precision
If dual gate system with sequential scanning is used, then measurement precision is improved for mobility spectrum reconstruction, but loss of time increases due to lengthy experiment duration
Solution Approach 1:
The patent implements continuous ion detection throughout the drift tube flight time. Instead of sequentially scanning and waiting for each mobility window, the system continuously detects ions across all mobility windows simultaneously during their drift through the tube. This continuous action eliminates idle scanning time while maintaining spectral reconstruction accuracy.
Solution Approach 2:
The patent performs preliminary separation of ions by mobility in the drift tube before detection. Ions are pre-separated spatially and temporally during their drift, so that when they reach the detector, they are already organized by mobility window. This preliminary action eliminates the need for time-consuming sequential scanning during detection, reducing experiment duration while preserving measurement precision.
3Productivity
If traditional ion gate operation is used, then device complexity is minimized, but productivity deteriorates due to inability to process multiple mobility windows simultaneously
Solution Approach 1:
The patent employs dynamic gate control where the ion gate timing and window positions are adjusted based on the specific analytical requirements. The gate system can dynamically open and close at different times to select specific mobility windows, allowing flexible concurrent processing of multiple windows. This dynamic control enables high productivity while keeping the physical gate structure relatively simple.
Solution Approach 2:
The patent changes the temporal parameters of ion gate operation to achieve simultaneous transmission of multiple mobility windows. By adjusting gate opening times, closing times, and duty cycles, the system can selectively transmit different mobility windows in a coordinated manner. This parameter-based control achieves concurrent processing capability without requiring complex additional hardware.
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 faster and more efficient analysis of complex samples by allowing multiple IMS peaks to be interrogated concurrently during HPLC experiments, improving the throughput and specificity of mass spectrometry data, particularly in pharmaceutical reaction monitoring and peptide identification.
Implementation Method 1
subsequent to separation by mobility in the drift tube
Implementation Method 2
dual gate ion mobility devices provide an effective means by which mobility-mass experiments can be accomplished
Data Source
AI summary
A second gate in an Ion Mobility Spectrometer is used to select or block different time windows of the ion mobility spectrum. A second gate in the Ion Mobility Mass Spectrometer is used to modulate peak intensities in the IMS spectrum, allowing each peak in the IMS spectrum to be unambiguously matched with its set of fragment ions in a subsequent MS-MS mass spectrum.