Segmented Linear Ion Trap for High Throughput Mass Spectrometry
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Solution Overview
Problem
Conventional linear ion traps face challenges in efficiently performing tandem mass spectrometry and handling a large dynamic range of mass-to-charge ratios, requiring improved methods to enhance precision, throughput, and automation in biological and biochemical applications.
Innovation Solution
A spatially partitionable linear ion trap with multiple segments allows for independent manipulation and expulsion of ion populations, enabling simultaneous processing and detection, optimized ion capacity, and reduced scan time by partitioning ions based on mass-to-charge ratios and using distinct q parameters for ion motion stability diagrams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional three-sectioned linear ion trap is used, then the device structure is simple, but the throughput and data quality are insufficient for high-demand applications
Solution Approach 1:
The linear ion trap is divided into multiple independently controllable segments along the axial direction. Each segment can manipulate and expel ion populations independently, enabling parallel processing of multiple ion populations simultaneously. This segmentation increases throughput by allowing simultaneous MS/MS experiments on different ion populations while maintaining a relatively simple overall device structure.
2Loss of time
If ions are processed sequentially in a conventional linear ion trap, then the device operation is simple, but the scan time is too long for high throughput applications
Solution Approach 1:
Multiple segments enable parallel processing of different ion populations simultaneously. Each segment can perform isolation, fragmentation, and expulsion operations on different ion populations at the same time, dramatically reducing scan time. For example, while one segment processes precursor ions for MS/MS, another segment can simultaneously process different ions or perform preparatory operations.
Solution Approach 2:
The segmented design allows continuous processing by eliminating idle time between sequential operations. While one segment is expelling ions, another segment is already preparing the next batch of ions for processing, ensuring continuous productive operation and minimizing scan time without overly complicating the operation.
3Quantity of substance
If the ion trap capacity is increased to handle large dynamic range, then the measurement range improves, but the precision and data quality deteriorate due to space charge effects
Solution Approach 1:
By dividing the ion trap into multiple segments, each segment can maintain a manageable ion population within its space charge limits while collectively handling a broad dynamic range. Each segment optimizes its ion capacity independently, preventing space charge effects from degrading data quality, while the overall system achieves high ion capacity through parallel operation of multiple segments.
Solution Approach 2:
Each segment can be optimized for specific ion populations or mass ranges, allowing local optimization of ion capacity and precision. Different segments can handle different portions of the dynamic range with appropriate ion populations, ensuring high data quality for each segment while collectively covering a broad mass range.
4Productivity
If a single ion population is processed at a time, then the operation is straightforward, but the productivity is insufficient for high throughput requirements
Solution Approach 1:
Multiple independently controllable segments enable simultaneous manipulation and processing of multiple ion populations in parallel. Each segment can perform isolation, fragmentation, and expulsion operations on different ion populations at the same time, significantly increasing throughput. The segmented architecture allows complex parallel operations while maintaining relatively simple control for each individual segment.
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 rapid tandem mass spectrometry with improved data quality and reduced scan time, optimizing ion capacity and processing efficiency across a broad mass range, particularly beneficial for proteomic applications.
Implementation Method 1
spatially partition an initial ion population into at least a first and a second ion population... ions corresponding to the first ion population can be expelled by shifting the ions from a region of stable ion motion to a region of unstable motion in an (a,q) stability diagram for ion motion
Implementation Method 2
maintain the spatial partitioning of the initial population within the linear ion trap... region of stable ion motion to a region of unstable ion motion in an (a,q) stability diagram
Data Source
AI summary
A method and apparatus are provided for operating a linear ion trap. A linear ion trap configuration is provided that allows for increased versatility in functions compared to a conventional three-sectioned linear ion trap. In operation, the linear ion trap provides multiple segments, the segments spatially partitioning an initial ion population into at least a first and a second ion population, and enabling the ions corresponding to the first ion population to be expelled from the linear ion trap substantially simultaneously with the ions corresponding to the second ion population. Each segment is effectively independent and ions corresponding to the first ion population are able to be manipulated independently from ions corresponding to ions corresponding to the second ion population; the ions having been generated by an ion source under the same conditions.