Direct Performance of Triple-Stage Tandem Mass Spectrometry Analysis Using Dual-Direction Dipolar Excitation in a...

Area of Science:

• Analytical Chemistry
• Mass Spectrometry
• Physical Chemistry

Background:

• Tandem mass spectrometry (MS/MS) is crucial for molecular analysis.
• Traditional triple-stage MS/MS (MS/MS/MS) in ion traps is complex and time-consuming.
• Collision-induced dissociation (CID) typically uses AC signals for excitation.

Purpose of the Study:

• To develop a simplified and efficient method for direct MS/MS/MS analysis.
• To enhance fragment ion intensity and spectral information in ion trap mass spectrometry.
• To improve the speed and accuracy of analyzing complex chemical samples.

Main Methods:

• Developed digital ion trap technology with simultaneous dual-direction dipole excitation.
• Applied dual-direction excitation for direct MS/MS/MS spectra acquisition.
• Utilized increased pseudopotential well depth for lower precursor ion q values.

Main Results:

• Direct MS/MS/MS spectra acquisition was achieved, simplifying workflows.
• Dual-direction excitation enhanced product ion intensity and spectral information.
• Effectively distinguished between isomeric compounds (n-butyl acetate and isobutyl acetate) and analyzed volatile hazardous chemicals rapidly.

Conclusions:

• Digital ion trap technology with dual-direction excitation enables direct MS/MS/MS.
• The method offers simplified workflows, faster analysis, and enhanced accuracy.
• Improved fragment ion intensities and richer spectral data benefit compound analysis, especially for low mass fragments.