Identification and structural analysis of cereal arabinoxylan-derived oligosaccharides by negative ionization HILIC-MS/MS

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Abstract

Recent works provide evidence of the prebiotic potential of arabinoxylan-derived oligosaccharides (A)XOS. In this study, we developed a structural analysis for cereal-derived (A)XOS by negative ionization HILIC-MS/MS. Initially, we assessed twelve (A)XOS samples of known structures with different linkage positions and branching points by direct-infusion negative ESI-MSn. We subsequently developed the negative ion HILIC-MS/MS with a post-column addition of ammonium chloride. The selected (A)XOS represented both linear (arabinofuranosyl residue linked to the non-reducing end of xylooligosaccharide) and branched structures. Each (A)XOS sample produced a specific spectrum in negative ion ESI-MSn. By analyzing cross-ring fragment ions, we determined the linkage positions of linear (A)XOS. The presence or absence of diagnostic ions in the MS3 allowed us to detect different branches (O-2- or/and O-3-linked arabinofuranosyl with/or without O-4-linked xylopyranosyl at the non-reducing end). Furthermore, we could identify all analyzed samples by HILIC-MS/MS, based on the formed spectral library and chromatographic retention times.
Original languageEnglish
JournalFood Chemistry
Volume275
Pages (from-to)176-185
Number of pages10
ISSN0308-8146
DOIs
Publication statusPublished - 1 Mar 2019
MoE publication typeA1 Journal article-refereed

Fields of Science

  • 416 Food Science
  • Tandem mass spectrometry
  • Oligosaccharides
  • Arabinoxylan
  • Negative ionization
  • Linkage analysis
  • ELECTROSPRAY MASS-SPECTROMETRY
  • ASSISTED-LASER-DESORPTION/IONIZATION
  • HUMAN-MILK OLIGOSACCHARIDES
  • UNDERIVATIZED OLIGOSACCHARIDES
  • LIQUID-CHROMATOGRAPHY
  • XYLO-OLIGOSACCHARIDES
  • ION MODE
  • PART 1
  • SPECTRA
  • MSN

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