Česká společnost pro hmotnostní spektrometrii

(5. konference České společnosti pro hmotnostní spektrometrii - WeO-001)
Energy resolved CID and spectral comparisons

Károly Vékey ^1 *, Fanni Bazso ¹, Oliver Ozohanics ¹, Agnes Gomory ¹, Lilla Turiak ¹, Laszlo Drahos ¹

1. Research Centre for Natural Sciences, Hungarian Academy of Sciences

Abstrakt

Collisional excitation and collision induced decomposition (CID) is a central aspect of the highly successful MS/MS technique. In spite of its importance, collisional excitation is of peripheral interest in most studies on MS/MS. In the present “Detlef Schroder” lecture we shall look at energy dependent CID spectra to demonstrate its importance and inherent possibilities.

We have developed/applied a mathematical formalism to characterize similarity of (tandem) mass spectra. This allowed quantitative comparisons on energy dependence: how similar are (or how similar can be) MS/MS spectra on various instruments. The most important parameter changing the aspect of an MS/MS spectrum is the collision energy; which can be varied on most instruments. We have studied energy dependence on various instruments and instrument types, like QQQ, QTOF and ion trap instruments. We have also compared other instrumental parameters, like the type and pressure of the collision gas; and compared the influence of these parameters to that of the collision energy. We have also checked if the laboratory-frame, or the centre of mass (com) frame collision energy is more useful for quantitative comparisons.

These fundamental studies have been followed by structural studies on peptides and glycopeptides. We shall show practical examples, how energy dependent mass spectra may be used to gain structural information – either activation parameters or improvement in structure assignment.

* Korespondující autor: vekey.karoly@ttk.mta.hu

Poděkování:

OTKA 109006 for financial support.