title: Structure identification of natural rhamnolipid mixtures by fast atom bombardment tandem mass spectrometry.
abstract: Two rhamnobiose-lipid preparations have been studied by fast atom bombardment (FAB) tandem mass spectrometry. The principal rhamnobiose-lipids contain the beta-hydroxydecanoyl-beta-hydroxydecanoate Rha-Rha-C10-C10 and the beta-hydroxytetradecanoyl-beta-hydroxytetradecanoate Rha-Rha-C14-C14. Both preparations contain minor components which are heterogenous in beta-hydroxy fatty acid composition. FAB ionization of rhamnobiose-lipids in the presence of Na+ shows the formation of both [M + Na]+, [M +2Na-H]+, [M + 3Na-2H]+ and [M - H]- ions. Tandem mass spectrometry of the [M + 2Na-H]+ and [M - H]- ions give information about the sequence of the building blocks. Particularly, heterogeneity in beta-hydroxy fatty acid composition is determined for the principal components and all the minor components present in the preparations.
authors.affiliation: Bijvoet Center for Biomolecular Research, Department of Mass Spectrometry, University of Utrecht, The Netherlands.
authors.forename: A
authors.initials: A
authors.lastname: Manso Pajarron
authors.forename: C G
authors.initials: CG
authors.lastname: De Koster
authors.forename: W
authors.initials: W
authors.lastname: Heerma
authors.forename: M
authors.initials: M
authors.lastname: Schmidt
authors.forename: J
authors.initials: J
authors.lastname: Haverkamp
mesh_terms: D002240:Carbohydrate Sequence; D008055:Lipids / Q000737:chemistry*; D008969:Molecular Sequence Data; D015394:Molecular Structure; D011549:Pseudomonas / Q000737:chemistry; D012210:Rhamnose / Q000737:chemistry*; D016339:Spectrometry, Mass, Fast Atom Bombardment
chemical_list: D008055:Lipids; D012210:Rhamnose