Multi-Pressure Chemical Ionization for Broad Breath Compound Detection
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Solution Overview
Problem
Current breath analysis devices struggle to detect a wide range of volatile and non-volatile compounds in exhaled breath due to limitations in ionization efficiency and methodological standardization, leading to skepticism about their diagnostic potential.
Innovation Solution
A multi-pressure chemical ionization multi-ion identification device (MPCI MION-MS) that combines high-pressure and low-pressure ionization schemes with machine learning algorithms to analyze a broad spectrum of compounds, including polar and non-polar molecules, using a Multi-Pressure Chemical Ionization Multi Ion Orbitrap Mass Spectrometer (MPCI MION-OT-MS) for comprehensive gas phase analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional ionization methods (GC, PTR-MS) are used for breath analysis, then the system is simple and easy to operate, but the detection capability is limited to certain ranges of compounds with poor ionization efficiency
Solution Approach 1:
The ionization process is segmented into multiple pressure stages (atmospheric pressure ionization followed by vacuum pressure ionization), allowing different ionization mechanisms to operate at optimal pressures. This segmentation enables detection of diverse compound classes without requiring multiple separate instruments, thus improving versatility while managing complexity through integrated design.
Solution Approach 2:
The mass spectrometer is designed to perform multiple ionization functions within a single instrument. By incorporating both atmospheric pressure chemical ionization (APCI) and vacuum chemical ionization (VCI) capabilities, the system can detect a universal range of compounds including volatile organic compounds, semi-volatiles, and non-volatiles, eliminating the need for multiple specialized devices.
2Measurement precision
If atmospheric pressure ionization is used, then ionization efficiency is improved for polar compounds, but collision losses increase reducing detection sensitivity
Solution Approach 1:
The ionization process is divided into two pressure regimes: atmospheric pressure stage for efficient ionization of polar compounds, followed by a vacuum stage where collision losses are minimized. This segmentation allows the system to capture the benefits of high ionization efficiency while subsequently reducing energy losses through pressure reduction before mass analysis.
Solution Approach 2:
The system dynamically changes the pressure parameter between ionization stages. Atmospheric pressure conditions favor ionization efficiency for polar compounds, while subsequent vacuum conditions reduce collision frequency and energy loss. This parameter change optimizes both ionization efficiency and detection sensitivity for different compound types.
3Loss of energy
If low pressure ionization is used, then collision losses are reduced improving sensitivity, but ionization efficiency decreases for polar and functionalized compounds
Solution Approach 1:
The ionization process is segmented into atmospheric pressure ionization (for efficient ionization of polar compounds) followed by vacuum pressure ionization (for reduced collision losses). This two-stage segmentation allows the system to achieve both high ionization efficiency for functionalized compounds and high detection sensitivity by performing ionization at optimal pressures for each compound class.
Solution Approach 2:
The pressure parameter is changed between ionization stages to optimize performance. Atmospheric pressure conditions maximize ionization efficiency for polar compounds, while vacuum conditions minimize collision losses. This parameter change strategy enables the system to overcome the limitations of single-pressure ionization methods.
4Adaptability or versatility
If multiple ionization methods are combined in one device, then the detection range is expanded to cover diverse compound classes, but the device complexity increases
Solution Approach 1:
Multiple ionization methods (atmospheric pressure chemical ionization and vacuum chemical ionization) are merged into a single integrated mass spectrometer device. This combining approach expands the detection range to cover volatile organic compounds, semi-volatiles, and non-volatiles simultaneously, while the integrated design manages complexity through shared components and unified control systems.
Solution Approach 2:
The mass spectrometer is designed with universal multi-functionality to perform diverse ionization tasks. By incorporating both APCI and VCI capabilities along with multiple reagent ion sources, the device can detect a universal range of compound classes without requiring multiple separate instruments, thus expanding detection range while maintaining manageable complexity through consolidation.
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
Enables the detection of a wide variety of chemical compounds in exhaled breath with unprecedented sensitivity and selectivity, providing data for personalized medical diagnoses and creating a knowledge base for gas phase chemistry, overcoming the limitations of existing technologies.
Implementation Method 1
The ionization source is configured to ionize reagent molecules to reagent ions
Implementation Method 2
chemical ionization of analyte molecules with the reagent ions to form analyte ions
Data Source
AI summary
The present disclosure of the invention concerns embodiments directed to a multi-pressure chemical ionization multi-ion identification device (MPCI MION device), a system and method using the same to utilize chemical ionization (CI) in multiple adduct formation from the substances in the sampled gas of a gas sample being addressed to be analyzed in a mass analyzer. The multi-pressure multi-ion identification (MPCI MION) device comprises a buffering region to have the sample flow turbulence decayed before the sample flow entrance to the low pressure ionization regions (IR(A)), IR(B), (IR(B′), (IR(C′), IR(D′)) (IR(E′)) utilizing chemical ionization by reagents from an ensemble of reagent ion towers (R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R16, R17, R18,).