Title: Mass spectrometric fragmentation of cyclic peptides belonging to the polymyxin and colistin antibiotics studied by ion trap and quadrupole/orthogonal-acceleration time-of-flight technology
Authors: Govaerts, Cindy ×
Rozenski, Jef
Orwa, Jennifer
Roets, Eugene
Van Schepdael, Ann
Hoogmartens, Jos #
Issue Date: Jan-2002
Series Title: Rapid communications in mass spectrometry : RCM vol:16 issue:9 pages:823-33
Abstract: Electrospray ionization linked to quadrupole/orthogonal-acceleration time-of-flight (Q/oaTOF) and ion trap equipment was used to study the fragmentation behavior of the linear side-chain cyclized peptides of the polymyxin B and E antibiotics. This study exemplifies both the benefits and the drawbacks of mass spectrometric techniques for the determination of the sequence of such complex linear side-chain cyclized peptides. Q/oaTOF accurate mass measurements did not help sufficiently to assign the product ions observed in the product ion spectra. An ion trap mass spectrometer providing MS(n) capability was used to eliminate ambiguities encountered with a single MS/MS approach. The complex fragmentation behavior of these compounds of well-established structure is described which could be useful for structural characterization of unknown substances related to polymyxin B and E in the future.
ISSN: 0951-4198
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Pharmaceutical Analysis
Medicinal Chemistry (Rega Institute)
× corresponding author
# (joint) last author

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