Glycoconjugate Journal

, Volume 30, Issue 2, pp 159–170 | Cite as

Novel data analysis tool for semiquantitative LC-MS-MS2 profiling of N-glycans

  • Hannu PeltoniemiEmail author
  • Suvi Natunen
  • Ilja Ritamo
  • Leena Valmu
  • Jarkko Räbinä


Despite recent technical advances in glycan analysis, the rapidly growing field of glycomics still lacks methods that are high throughput and robust, and yet allow detailed and reliable identification of different glycans. LC-MS-MS2 methods have a large potential for glycan analysis as they enable separation and identification of different glycans, including structural isomers. The major drawback is the complexity of the data with different charge states and adduct combinations. In practice, manual data analysis, still largely used for MALDI-TOF data, is no more achievable for LC-MS-MS2 data. To solve the problem, we developed a glycan analysis software GlycanID for the analysis of LC-MS-MS2 data to identify and profile glycan compositions in combination with existing proteomic software. IgG was used as an example of an individual glycoprotein and extracted cell surface proteins of human fibroblasts as a more complex sample to demonstrate the power of the novel data analysis approach. N-glycans were isolated from the samples and analyzed as permethylated sugar alditols by LC-MS-MS2, permitting semiquantitative glycan profiling. The data analysis consisted of five steps: 1) extraction of LC-MS features and MS2 spectra, 2) mapping potential glycans based on feature distribution, 3) matching the feature masses with a glycan composition database and de novo generated compositions, 4) scoring MS2 spectra with theoretical glycan fragments, and 5) composing the glycan profile for the identified glycan compositions. The resulting N-glycan profile of IgG revealed 28 glycan compositions and was in good correlation with the published IgG profile. More than 50 glycan compositions were reliably identified from the cell surface N-glycan profile of human fibroblasts. Use of the GlycanID software made relatively rapid analysis of complex glycan LC-MS-MS2 data feasible. The results demonstrate that the complexity of glycan LC-MS-MS2 data can be used as an asset to increase the reliability of the identifications.


Glycomics Mass spectrometry Bioinformatics Immunoglobulin Fibroblast 



N-glycolylneuraminic acid Neu5Gc


Electrospray ionization


Deoxyhexose (fucose)


Hexose Hex


In-source decay


Intravenous immunoglobulin


Liquid chromatography


Linear trap quadrupole


Matrix-assisted laser desorption ionization


Mass Spectrometry


Tandem Mass Spectrometry


N-acetylhexosamine HexNAc


Normal human dermal fibroblasts




Retention time


N-acetylneuraminic acid Neu5Ac (sialic acid)





We would like to thank Lotta Andersson and Birgitta Rantala for skillful technical assistance.


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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Hannu Peltoniemi
    • 1
    Email author
  • Suvi Natunen
    • 2
  • Ilja Ritamo
    • 2
  • Leena Valmu
    • 2
  • Jarkko Räbinä
    • 2
  1. 1.Applied Numerics LtdHelsinkiFinland
  2. 2.Finnish Red Cross Blood ServiceHelsinkiFinland

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