Mobility labeling for parallel CID of ion mixtures

Area of Science:

• Analytical Chemistry
• Mass Spectrometry
• Biophysical Chemistry

Background:

• Collision-induced dissociation (CID) is crucial for analyzing molecular structures.
• Analyzing CID patterns for multiple ions simultaneously presents significant challenges.
• Existing methods often lack the ability to directly correlate fragment ions with their specific parent ions in complex mixtures.

Purpose of the Study:

• To develop a novel ion mobility/mass spectrometry (IM/MS) technique.
• To enable parallel recording of CID patterns for multiple ions.
• To establish a method for unambiguous determination of fragment ion origins.

Main Methods:

• Utilizing ion mobility separation in a drift tube based on ion mobility through a buffer gas.
• Accelerating separated ions into a collision cell for CID.
• Employing time-of-flight mass spectrometry (TOF-MS) to analyze fragment ions.
• Correlating fragment ion drift times with parent ion drift times.

Main Results:

• Demonstrated parallel recording of CID patterns for multiple ions.
• Successfully linked fragment ions (a-, b-, y-type) to their [M + H]+ parent ion.
• The technique allows for the determination of fragment origins from a mixture of ions.
• Fragmentation patterns of [D-Ala2,3]methionine enkephalin were analyzed.

Conclusions:

• The developed IM/MS technique offers a powerful approach for analyzing CID patterns in complex ion mixtures.
• This method facilitates the direct correlation of fragment ions with their parent ions.
• The technique enhances structural elucidation capabilities in mass spectrometry.