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Using a Cyclic Ion Mobility Spectrometer for Tandem Ion Mobility Experiments

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Chemometric data analysis for deconvolution of overlapped ion mobility profiles.

Behrooz Zekavat¹, Touradj Solouki

¹Department of Chemistry and Biochemistry, Baylor University, Waco, TX 76706, USA.

Journal of the American Society for Mass Spectrometry

|September 6, 2012

Summary

This study introduces a new data analysis method to separate overlapping ion mobility (IM) species using fragmentation patterns. The technique successfully deconvolutes complex mixtures, enabling clearer analysis of peptides and sugar isomers.

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Area of Science:

Analytical Chemistry
Biochemistry
Chemometrics

Background:

Ion mobility (IM) spectrometry separates ions based on size and charge.
Overlapping IM signals complicate the analysis of complex mixtures.
Distinguishing isobaric or co-eluting species requires advanced analytical techniques.

Purpose of the Study:

To develop and validate a data analysis approach for deconvoluting ion mobility (IM) overlapped species.
To leverage ion fragmentation variations across IM arrival times for improved separation.
To provide a method for calculating individual component spectra from mixture data.

Main Methods:

Utilized a custom data preprocessing platform for post-IM/collision-induced dissociation mass spectrometry (post-IM/CID MS) data conversion.
Applied Principle Component Analysis (PCA) to identify mobility-overlapped species.
Employed interactive self-modeling mixture analysis for spectral deconvolution.

Main Results:

Demonstrated PCA's utility in detecting mobility-overlapped species in post-IM/CID MS data.
Successfully calculated total IM spectra (TIMS) and CID mass spectra for individual components in mixtures.
Validated PCA and deconvolution techniques using peptide and isobaric sugar isomer mixtures.

Conclusions:

The developed data analysis approach effectively deconvolutes IM-overlapped species.
PCA and IM deconvolution provide complementary data for validating spectral profiles.
The method is applicable to diverse mixtures, including peptides and isobaric isomers.