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Using a Cyclic Ion Mobility Spectrometer for Tandem Ion Mobility Experiments

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Published on: January 20, 2022

Multiplexed MS/MS in a miniature rectilinear ion trap.

Adam M Graichen¹, Richard W Vachet

¹Department of Chemistry, University of Massachusetts, LGRT 701, 710 N. Pleasant St., Amherst, MA 01003, USA.

Journal of the American Society for Mass Spectrometry

|April 8, 2011

Summary

A new multiplexed method enables simultaneous MS/MS analysis of multiple ions in a miniature rectilinear ion trap (RIT). This technique decodes complex spectra by analyzing ion intensity changes during external injection, improving mass spectrometry efficiency.

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Area of Science:

Analytical Chemistry
Mass Spectrometry
Spectroscopy

Background:

Multiplexed MS/MS analysis enhances throughput in mass spectrometry.
Rectilinear ion traps (RITs) offer miniaturization potential for mass spectrometers.
Efficient ion manipulation and detection are crucial for complex mixture analysis.

Purpose of the Study:

To develop a multiplexed MS/MS method for simultaneous analysis of multiple ions.
To leverage ion encoding via mass bias during external injection into a rectilinear ion trap.
To enable deconvolution of multiplexed MS/MS spectra for enhanced data interpretation.

Main Methods:

Utilized a miniature rectilinear ion trap (RIT) mass spectrometer.
Implemented an ion encoding procedure based on mass bias during external ion injection.
Varied radiofrequency (rf) amplitudes and low mass cutoff (LMCO) values during ion accumulation.
Analyzed precursor ion intensity changes and correlated them with product ion intensities.

Main Results:

Demonstrated a Gaussian-like ion injection profile dependent on rf amplitude/LMCO.
Established a relationship between ion m/z and trapping efficiency, likely due to optimal pseudo-potential well depths.
Showed that precursor ion intensity changes predict corresponding product ion changes.
Successfully deconvoluted multiplexed MS/MS spectra based on observed ion intensity correlations.

Conclusions:

The developed multiplexed MS/MS method allows simultaneous analysis of multiple ions in a miniature RIT.
Ion encoding via controlled injection parameters enables effective spectral deconvolution.
This approach significantly advances the capabilities of RIT mass spectrometry for complex sample analysis.