Low-Temperature Plasma Ionizer for Real-Time VOC Analysis
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Solution Overview
Problem
Current VOC analysis techniques, such as GC-MS and SIFT-MS, are limited by requiring sample preconcentration, long analysis times, and inability to analyze VOCs directly from surfaces or in real-time, especially for diagnostic applications like breast cancer detection.
Innovation Solution
A system and method using low-temperature plasma mass spectrometry (LTP-MS) that ionizes VOCs adsorbed on an adsorbent membrane, allowing for direct analysis of ionized gases with a mass spectrometer, enabling real-time detection and reducing analysis time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If GC-MS or FID techniques are used for VOC analysis, then identification and quantification information is improved, but analysis time increases to about 30 minutes
Solution Approach 1:
The patent extracts and eliminates the preconcentration and high-temperature desorption steps from the traditional GC-MS workflow. By using LTP-MS with direct atmospheric pressure ionization, the system analyzes VOCs in real-time without requiring sample preconcentration on resins or adsorbent stationary phases, reducing analysis time from 30 minutes to near real-time while maintaining identification and quantification capabilities
Solution Approach 2:
The patent replaces the mechanical GC separation system with a direct LTP-MS ionization and detection system. Instead of using GC columns for separation followed by MS or FID detection, the system uses low-temperature plasma at atmospheric pressure for direct ionization and mass spectrometric analysis, eliminating the time-consuming GC separation step while preserving analytical information
2Productivity
If SIFT-MS technique is used for real-time VOC analysis, then analysis speed and ease of operation are improved, but the ability to analyze surface adsorbed VOCs deteriorates
Solution Approach 1:
The patent makes the LTP-MS system universal by enabling it to analyze both gaseous VOCs and surface-adsorbed VOCs using the same instrumentation. The low-temperature plasma ionization source can ionize VOCs whether they are in the gas phase or adsorbed on surfaces, providing both real-time analysis capability and surface analysis capability through a single system
Solution Approach 2:
The patent changes the ionization parameters by using low-temperature plasma at atmospheric pressure instead of the high-vacuum plasma used in traditional SIFT-MS. This parameter change allows the system to handle both gaseous and surface-adsorbed samples effectively, as the atmospheric pressure plasma can interact with VOCs in both states without requiring vacuum conditions
3Productivity
If PTR-MS technique is used for rapid VOC analysis, then analysis speed is improved, but the ability to analyze VOCs with lower proton affinity deteriorates
Solution Approach 1:
The patent changes the ionization mechanism from proton transfer (PTR-MS) to low-temperature plasma ionization (LTP-MS). This parameter change enables the detection of VOCs with lower proton affinity because plasma ionization does not rely on proton transfer reactions, which are limited to compounds with higher proton affinity than hydronium ion. The plasma generates a broader range of ions that can react with diverse VOCs regardless of their proton affinity
Solution Approach 2:
The patent replaces the proton transfer reaction mechanism with a plasma-based ionization mechanism. Instead of using H3O+ ions for proton transfer, the system uses low-temperature plasma to generate multiple ion species that can ionize VOCs through various mechanisms including electron impact, ion-molecule reactions, and radiative processes, thereby expanding detection capability to include VOCs with lower proton affinity
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
Facilitates rapid, real-time analysis of VOCs from surfaces, improving diagnostic accuracy and efficiency, particularly for breast cancer detection by providing actionable medical status information.
Implementation Method 1
a low-temperature plasma ionizer suitable for emitting a plasma stream in a plasma emission direction, thus ionizing the VOCs adsorbed by the membrane
Implementation Method 2
ionizing the VOCs adsorbed by the membrane and forming an ionized gas laden with VOCs
Data Source
AI summary
A system and method for analyzing volatile organic compounds (VOCs) adsorbed on an adsorbent membrane, by low-temperature plasma and mass spectrometry (LTP-MS). The system includes a receptacle for receiving the adsorbent membrane, a low-temperature plasma ionizer configured to emit a plasma stream in a plasma emission direction, thereby ionizing the VOCs adsorbed by the membrane and forming a VOC-laden ionized gas, and a mass spectrometer for analyzing the ionized VOCs.