Abstract
Flavomycin is a commercially available antimicrobial growth promoter and an authorized additive for feeding stuffs in the EU and in the USA. As most antibiotically active products biosynthesized by microorganisms, it contains not only a single active compound but is a complex mixture of structurally closely related substances. Multistage matrix-assisted laser desorption/ionization-ion trap/reflectron time-of-flight mass spectrometry (MALDI-IT/RTOF-MS) and liquid chromatography-electrospray ionization-ion trap-mass spectrometry (LC-ESI-IT-MS) were utilized for a detailed analysis of the constituents of the Flavomycin complex based on low-energy collision induced dissociation (CID). An optimal sample preparation for negative ion vacuum MALDI-MS for this compound class was developed. The MALDI-IT/RTOF-MS2 and -MS3 analysis starting with the precursor [M−H]− ions of these interesting phosphoglycolipids, named moenomycins, yielded a large variety of product ions that facilitated the structural characterization of this class of compounds. Based on the derived CID fragmentation pathway of the five known major constituents, namely moenomycin A, moenomycin A12, moenomycin C4, moenomycin C3. and moenomycin C1, four not yet described moenomycin-type constituents could be characterized. They were assigned as 4F-demethyl-6E-O-de-β-D-glucopyranosyl-moenomycin A, 6B-N-de(2-hydroxy-5-oxo-1-cyclopenten-1-yl)-moenomycin A, 6B-hydroxy-6B-de[N-(2-hydroxy-5-oxo-1-cyclopenten-1-yl)amino]-moenomycin A, and 6C-hydroxy-moenomycin A. In addition, a moenomycin A carrying an oxygen in the moenocinol-group was found, which is most probably a chemical degradation product. These new compounds were verified by LC-ESI-IT-MS.
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Published online May 30, 2006
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Zehl, M., Pittenauer, E., Rizzi, A. et al. Characterization of moenomycin antibiotic complex by multistage MALDI-IT/RTOF-MS and ESI-IT-MS. The official journal of The American Society for Mass Spectrometry 17, 1081–1090 (2006). https://doi.org/10.1016/j.jasms.2006.04.019
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DOI: https://doi.org/10.1016/j.jasms.2006.04.019