CE-MSn of complex pectin-derived oligomers

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Abstract

As pectin molecules are too large and heterogeneous to analyze as a whole, the polymer is usually degraded to smaller oligomers, which are often analyzed by high-performance anion exchange chromatography (HPAEC). However, the high salt concentration necessary to elute pectin oligomers by HPAEC is incompatible with online mass detection. To overcome such a disadvantage, a CE-IT-MS system was set up to further elucidate the fine structure of charged oligosaccharides. An effective separation of differently substituted galacturonic acid containing oligomers was obtained by low-pH CE-LIF analysis. By adapting the buffer and capillary online MS detection was enabled. Moreover, with MS/MS it was possible to localize sugar residues' substitutions. With this combined CE-MS approach LIF electropherograms of xylogalacturonan and rhamnogalacturonan I digests could be annotated. The method was further exemplified by a complex oligomer mixture of acid hydrolyzed apple pectin, which was separated and characterized by CE-MSn. Oligomers present in low amounts could be localized by their corresponding m/z, as was demonstrated by selected mass range representation.
Original languageEnglish
Pages (from-to)2101-2111
JournalElectrophoresis
Volume29
Issue number10
DOIs
Publication statusPublished - 2008

Keywords

  • anion-exchange chromatography
  • capillary zone electrophoresis
  • trap mass-spectrometry
  • hairy ramified regions
  • maldi-tof ms
  • rhamnogalacturonan-i
  • 8-aminonaphthalene-1,3,6-trisulfonic acid
  • galacturonic acid
  • apple pectin
  • oligosaccharides

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