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Quadrupole ion-trap mass spectrometry to locate fatty acids on lipid A from Gram-negative bacteria
2002 (English)In: Analytical Biochemistry, ISSN 0003-2697, E-ISSN 1096-0309, Vol. 307, no 1, 131-137 p.Article in journal (Refereed) Published
Abstract [en]

The structure of lipid A released by mild acid hydrolysis from lipopolysaccharide from two strains of Shigella flexneri with different degrees of acylation was characterized using electrospray ionization (ESI) and ion-trap mass spectrometry. The lipid A was analyzed underivatized with ESI in negative-ion mode. With multiple stages of fragmentation (MSn), both the degree of acylation and the positions of the fatty acids on the disaccharide backbone could be determined. It was possible to determine the degree of acylation by the MSn technique, where in each MS stage the parent ion was an ion where one fatty acid had been eliminated. One way to determine the location of the fatty acids was by identifying cross-ring fragments of the reducing sugar from parent ions containing different numbers of fatty acids. Another was by identifying a possible charge-driven release of fatty acids situated close to a phosphate group. The fatty acids were otherwise eliminated by a charge-remote fragmentation mechanism. The combined data show the usefulness of ion-trap mass spectrometers for this type of analysis.

Place, publisher, year, edition, pages
2002. Vol. 307, no 1, 131-137 p.
National Category
Biochemistry and Molecular Biology
Identifiers
URN: urn:nbn:se:sh:diva-15791DOI: 10.1016/S0003-2697(02)00004-0ISI: 000177498000018PubMedID: 12137789OAI: oai:DiVA.org:sh-15791DiVA: diva2:508445
Available from: 2012-03-08 Created: 2012-03-07 Last updated: 2012-03-08Bibliographically approved

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