Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1185, Issue 2, Pages 241-250Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2008.01.065
Keywords
HPAEC-PAD-MS; HPAEC-PAD; capsular polysaccharide; Sinorhizobium; glycerophosphorylated glucan
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High performance anion exchange chromatography (HPAEC)-pulsed amperometric detection (PAD) is a performing technique for carbohydrate analysis, due to the selectivity and sensitivity of the detection. The identification occurs through retention times. In absence of standards, structural characterization of complex polysaccharides requests the coupling of HPAEC-PAD with electrospray ionization (ESI)-MS. This is a technological challenge, due to the non-volatility and high conductance of the eluents. Therefore, a desalting device has been installed on-line between the PAD and the MS. On-line HPAEC-MS has only been rarely described. We report here successful analysis of biological acidic oligosaccharides, allowing for the first time to demonstrate that membrane anchored 3-deoxy-D-manno-2 octulosonic acid (Kdo) homopolymers are consensus sinorhizobial capsular polysaccharide (KPS). (C) 2008 Elsevier B.V. All rights reserved.
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