Establishing Low-energy Sequential Decomposition Pathways of Leucine Enkephalin and Its N- and C-terminus Fragments Using Multiple-resonance CID in Quadrupolar Ion Guide

Overview

Journal J Am Soc Mass Spectrom

Specialty Chemistry

Date 2004 Dec 14

PMID 15589756

Citations 5

Authors

V Sergey Rakov

Oleg V Borisov

Craig M Whitehouse

Affiliations

Soon will be listed here.

Abstract

The simultaneous resonant low-energy excitation of leucine enkephalin and its fragment ions was demonstrated in a collision cell of the multipole-quadrupole time-of-flight instrument. Using low-amplitude multiple-resonance excitation CID, we were able to show the exclusive sequential fragmentation of N- and C-terminus fragments all the way to the final fragments--immonium ions of phenylalanine or tyrosine. In this CID mode the single-channel dissociation of each new generation of fragments followed the lowest energy decomposition pathways observable on the time scale of our experiment. Up to six generations of sequential dissociation were carried out in multiple-resonance CID experiments. The direct qualitative comparison of fragmentation of axial-acceleration versus resonant (radial) CID was performed in the same instrument. In both activation methods, fragmentation patterns suggested complex decomposition mechanisms attributable to dynamic competition between sequential and parallel dissociation channels.

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