Method of mass spectrometry and a mass spectrometer

Details Method of mass spectrometry and a mass spectrometer Method of mass spectrometry and a mass spectrometer

2006-01-03

2006-01-03

Lee, John R. (Department: 2881)

Radiant energy

Ionic separation or analysis

Methods

C250S281000, C250S287000, C250S288000, C250S290000

Reexamination Certificate

active

06982414

ABSTRACT:
A method of mass spectrometry is disclosed wherein a gas collision cell is repeatedly switched between a fragmentation and a non-fragmentation mode. Parent ions from a first sample are passed through the collision cell and parent ion mass spectra and fragmentation ion mass spectra are obtained. Parent ions from a second sample are then passed through the collision cell and a second set of parent ion mass spectra and fragmentation ion mass spectra are obtained. The mass spectra are then compared and if either certain parent ions or certain fragmentation ions in the two samples are expressed differently then further analysis is performed to seek to identify the ions which are expressed differently in the two different samples.

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