A Structures for Lossless Ion Manipulations (SLIM) Module for Collision Induced Dissociation

Area of Science:

• Analytical Chemistry
• Mass Spectrometry
• Separation Science

Background:

• Collision-induced dissociation (CID) is crucial for peptide fragmentation in mass spectrometry.
• Ion mobility (IM) separation enhances analytical depth but requires efficient fragmentation methods.
• Previous CID methods faced limitations in efficiency and operating pressure.

Purpose of the Study:

• To introduce and evaluate a novel collision-induced dissociation (CID) module integrated with Structures for Lossless Ion Manipulations (SLIM) technology.
• To assess the efficiency of the SLIM CID module for peptide fragmentation.
• To demonstrate the application of the SLIM CID module in conjunction with ion mobility separation.

Main Methods:

• A SLIM CID module was developed and coupled to a quadrupole time-of-flight (QTOF) mass spectrometer.
• The module was positioned after an ion mobility (IM) drift tube for IM/CID/MS experiments.
• CID efficiency was quantified using the model peptide leucine enkephalin and a mixture of nine peptides.

Main Results:

• The SLIM CID module achieved a CID efficiency of 62%, comparable to existing beam-type CID methods.
• Successful fragmentation of a nine-peptide mixture was demonstrated after IM separation.
• The SLIM CID module operated effectively at 0.3–0.5 Torr, a significantly lower pressure range than previously reported.

Conclusions:

• The developed SLIM CID module is an efficient tool for peptide fragmentation in IM/CID/MS workflows.
• This technology enables high-efficiency fragmentation at reduced operating pressures, expanding the applicability of SLIM.
• The findings pave the way for enhanced structural characterization of peptides and other biomolecules.