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J Am Soc Mass Spectrom. 2005 Apr;16(4):548-52.

Characterization of an N-acylated glucagon-like peptide-1 derivative by electron capture dissociation.

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  • 1Department of Chemistry, University of Southern Denmark, Odense, Denmark. kfh@chem.sdu.dk


An N-acylated glucagon-like peptide 1 derivative was characterized by Fourier transform ion cyclotron resonance mass spectrometry. Both electron capture dissociation (ECD) and sustained off-resonance irradiation collisionally activated dissociation (SORI-CAD) were employed. While ECD revealed full sequence coverage, site of modification, branching point, structure of the palmitoylated modification, SORI-CAD produced less complete and more ambiguous information attributable to facile losses of the fatty acid group from both parent and fragments. Thus, ECD showed a superior characterization performance over SORI-CAD in analysis of N-acylated polypeptides.

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