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Recent developments in ion-trap mass spectrometry and related technologies

Due to their versatility, quadrupole ion traps have become popular mass spectrometers in the growing field of proteomics. High sensitivity, user friendliness and low cost are the key features that have contributed to the success of the technology. However, mass measurement accuracy, resolution and mass range are still not comparable to the analytical performances obtained on other mass spectrometers. In the past 5 years, researchers have tried to overcome these drawbacks, focusing their attention on two different aspects of ion-trap mass spectrometry, development of novel types of ion traps and manipulation of the gas-phase ion chemistry, in order to obtain alternative techniques for tandem mass spectrometry analysis. In the field of trapping devices, improvements in instrumental design have led to the linear ion trap, digital ion trap and orbitrap. Activation methods based on electrons, chemically produced by an anion or from irradiation with an electron beam, have demonstrated their utility in providing complementary sequence information for improving confidence in protein identification.