Mesh-Collision Microtube Plasma Ion Source for Direct Mass Spectrometry Analysis

Area of Science:

• Analytical Chemistry
• Plasma Physics
• Materials Science

Background:

• Ambient ionization mass spectrometry (MS) is essential for rapid, direct sample analysis.
• Existing methods often require complex sample preparation or are limited in scope.
• Developing portable, efficient ionization sources is key for on-site applications.

Purpose of the Study:

• To present a compact device for direct online MS analysis using mesh-collision microtube plasma (MC-μTP) ionization.
• To demonstrate the device's capability for analyzing diverse sample types and monitoring volatile organic compounds (VOCs).
• To enhance ionization efficiency through optimized plasma-ion-molecule interactions.

Main Methods:

• Development of a self-aspirating MC-μTP device with a single microneedle electrode and a high-efficiency molecule-ion reactor.
• Integration of a screen mesh within the reactor to disrupt plasma and improve analyte ionization.
• Application of the device for differential analysis of red wine components and online monitoring of VOCs from leather products.

Main Results:

• The MC-μTP device achieved direct online MS analysis of various samples.
• Venn diagrams were used for differential analysis of red wine components.
• Online monitoring successfully detected eight distinct VOCs released from leather products under simulated conditions.

Conclusions:

• The developed MC-μTP ionization method offers a compact and efficient solution for direct MS analysis.
• The technology demonstrates significant potential for on-site VOC monitoring, particularly in enclosed environments like vehicle interiors.
• This advancement facilitates rapid sample-to-answer capabilities in real-world monitoring scenarios.