IMS Pre-screening Gate for Mass Spectrometry Throughput
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Solution Overview
Problem
Mass spectrometry-based trace detection systems face inefficiencies in real-world security screening due to the time-consuming nature of full MS/MS analysis and rapid contamination of ion traps, making them unsuitable for high-throughput applications like airport screening.
Innovation Solution
Implementing a pre-mass spectrometry screening step using Ion Mobility Spectroscopy (IMS) to pre-screen samples and control the flow of ions through a sample gate, allowing only positively identified ions to proceed to the mass spectrometer for further analysis, thereby reducing unnecessary ion flow and contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full MS/MS analysis is performed on all samples, then detection reliability is improved, but analysis time increases and throughput decreases
Solution Approach 1:
The analysis process is segmented into two stages: a rapid pre-screening stage using ion mobility spectroscopy (IMS) that filters samples, and a detailed MS/MS analysis stage that processes only positive samples. This segmentation allows the system to maintain high detection reliability for confirmed positives while achieving high throughput through efficient filtering of negative samples.
Solution Approach 2:
A preliminary screening action is performed using IMS before the full MS/MS analysis. The IMS pre-screen rapidly identifies positive samples that require further analysis, eliminating the need to perform time-consuming MS/MS analysis on all samples. This preliminary action resolves the contradiction by maintaining reliability for true positives while dramatically improving throughput.
2Measurement precision
If full MS/MS analysis is performed on all samples, then detection precision is improved, but ion trap contamination increases
Solution Approach 1:
The harmful factor of ion trap contamination is addressed by extracting only the necessary samples for detailed analysis. The IMS pre-screen extracts and identifies positive samples, allowing the system to perform precise MS/MS analysis only on these extracted samples rather than all samples, thereby minimizing ion trap contamination while maintaining detection precision.
Solution Approach 2:
A preliminary screening action using IMS is performed before MS/MS analysis to identify which samples require detailed examination. This preliminary action prevents unnecessary introduction of negative samples into the ion trap, reducing contamination while ensuring that all positive samples receive the precise MS/MS analysis they require for accurate detection.
3Object-generated harmful factors
If ion trap is cleaned frequently, then contamination is reduced, but system downtime increases
Solution Approach 1:
A preliminary screening using IMS is performed before samples enter the ion trap, preventing contamination at the source by identifying and routing only positive samples for MS/MS analysis. This preliminary action dramatically reduces the frequency of required cleanings and associated system downtime, as the ion trap is exposed to far fewer total samples.
Solution Approach 2:
The system uses feedback from the IMS pre-screen to control the sample gate, allowing ions to pass to the mass spectrometer only when positive samples are detected. This feedback mechanism ensures that the ion trap is protected from unnecessary contamination, reducing cleaning frequency and system downtime while maintaining optimal performance.
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 improves efficiency by reducing analysis time and minimizing ion trap contamination, enabling faster and more reliable detection of analytes with lower false alarm rates and higher throughput.
Implementation Method 1
Mass spectrometry measures the mass-to-charge ratio of charged particles from a sample to determine the masses of the particles, and thus the elemental composition of the sample. During mass spectrometry the components of the sample are ionized, which results in the formation of charged particles (ions).
Implementation Method 2
The ions are separated according to their mass-to-charge ratio in an analyzer by electromagnetic fields, and detected to produce an ion signal.
Implementation Method 3
A sample gate. The sample gate is configured to be opened to allow flow of at least a portion of the ionized sample from the pre-mass spectrometry apparatus to the mass spectrometer, and to be closed to prevent flow of the ionized sample
Data Source
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AI summary
A mass spectrometry system for screening a sample for one or more analytes includes a pre-mass spectrometry screening apparatus configured to pre-screen an ionized sample to generate output correlated to the composition of the sample, and a mass spectrometer. A sample gate is opened to allow flow of at least a portion of the ionized sample to the mass spectrometer and closed to prevent flow of the ionized sample to the mass spectrometer. A processing system compares results of the pre-mass spectrometry screening to an analyte database, wherein correlation of the results to an analyte within the analyte database comprises a preliminary positive identification. When the processing system determines that a preliminary positive identification is made, it causes the gate to open for a period of time. However, when the processing system determines that a preliminary positive identification is not made, it causes the gate to remain closed.