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Updated: May 15, 2026
08:40
Using a Cyclic Ion Mobility Spectrometer for Tandem Ion Mobility Experiments
Published on: January 20, 2022
Carbohydrate structure characterization by tandem ion mobility mass spectrometry (IMMS)2
Hongli Li1, Brad Bendiak, William F Siems
1Department of Chemistry, Washington State University, Pullman, Washington 99164, United States.
Analytical Chemistry
|January 22, 2013
Summary
A new IMMS-IMMS analysis method using dual gate drift tube ion mobility spectrometry (DTIMS) and traveling wave ion mobility spectrometry (TWIMS) enhances carbohydrate structural analysis. This technique improves isomeric separation and characterization of complex mixtures.
Area of Science:
- Analytical Chemistry
- Biochemistry
- Spectrometry
Background:
- Ion mobility spectrometry (IMS) coupled with mass spectrometry (MS) is crucial for analyzing complex biological molecules.
- Distinguishing isomers, molecules with the same chemical formula but different structures, remains a significant challenge in IMS-MS.
- Advancements in instrumentation are needed to improve the resolution and depth of isomer analysis.
Purpose of the Study:
- To develop and validate a novel IMMS-IMMS analysis method for enhanced structural characterization of isomeric compounds, particularly carbohydrates.
- To integrate a high-resolution dual gate drift tube ion mobility spectrometer (DTIMS) with a Synapt G2 high definition mass spectrometer (HDMS).
- To evaluate the capabilities of the new hybrid instrument for separating and analyzing isomeric ions and their fragments.
Main Methods:
- Interfacing a high-resolution ion mobility spectrometer with a Synapt G2 HDMS to create an IMMS-IMMS platform.
- Utilizing a dual gate drift tube ion mobility spectrometer (DTIMS) for initial ion selection and separation.
- Employing a traveling wave ion mobility spectrometer (TWIMS) for subsequent separation of fragment ions after collision-induced dissociation.
- Performing mobility-selected MS/MS experiments to analyze fragmentation patterns.
Main Results:
- The hybrid IMMS-IMMS instrument successfully enabled detailed structural analysis of carbohydrates.
- DTIMS demonstrated superior resolving power (70-80) compared to TWIMS (30-40) for physical separation of isomeric oligosaccharides.
- Mobility-selected MS/MS spectra revealed the existence of isomeric fragment ions with identical m/z values, highlighting the method's sensitivity.
Conclusions:
- The developed IMMS-IMMS analysis provides a powerful approach for dissecting isomeric heterogeneity in complex samples.
- The enhanced resolving power of DTIMS combined with TWIMS fragmentation analysis offers deeper insights into molecular structures.
- This methodology significantly advances the study of structural diversity in carbohydrates and other complex isomeric mixtures.
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