U-Shaped Mobility Analyzer: A Compact and High-Resolution Counter-Flow Ion Mobility Spectrometer

Area of Science:

• Analytical Chemistry
• Spectrometry
• Biophysics

Background:

• Counter-flow ion mobility spectrometers (IMS) offer improved resolution and functionality.
• There is a growing need for advanced analytical techniques in omics research.

Purpose of the Study:

• To develop a novel U-shaped mobility analyzer (UMA) for enhanced ion mobility spectrometry-mass spectrometry (IMS-MS).
• To demonstrate the UMA's capability for high-resolution ion selection and improved dynamic range.

Main Methods:

• Development of a U-shaped mobility analyzer (UMA) with two channels for ion manipulation.
• Implementation of a mobility band-pass filter by controlling electric fields in the UMA channels.
• Operation in both filter-scan and trap-scan modes for ion analysis.

Main Results:

• Achieved a resolution of ~180 for small organic molecules and ~370 for myoglobin in filter-scan mode.
• Achieved higher resolutions of ~210 for small organic molecules and ~590 for myoglobin in trap-scan mode.
• Demonstrated significant enhancement in the dynamic range of IMS-MS instruments.

Conclusions:

• The UMA device offers high resolution and dynamic range, benefiting targeted analysis in complex matrices.
• The UMA is suitable for omics studies, particularly for analyzing low-concentration analytes in high chemical backgrounds.
• The UMA's filter-scan mode is advantageous for scrutinizing trace analytes.