Characterization of a water soluble, hyperbranched arabinogalactan from yacon (Smallanthus sonchifolius) roots

Research output: Contribution to journalArticle


Yacon (Smallanthus sonchifolius Poepp. & Endl.) roots are largely grown in Andean countries and have attracted recent interest due to their antioxidant and prebiotic effects. Yacon is typically consumed as a fruit due to its sweet taste and juiciness. The macromolecular properties of an aqueous extract of yacon are investigated using asymmetric flow field-flow fractionation (AF4) coupled to UV, multiangle light scattering (MALS) and differential refractive index (dRI) detection. The method allows for determination of molar mass and size over the size distribution. Three major populations were found of which one strongly dominates in concentration. Through collection of fractions from AF4, carbohydrate composition and glycosidic linkage analysis for the dominating population was performed. The results show that the dominating population consists of a highly branched arabinogalactan (type 2) with a molar mass of approximately 1–2 · 105 g/mol, a hydrodynamic radius of approximately 6–10 nm and a relatively high apparent density (approx. 70–150 kg/m3).


External organisations
  • Universidad Mayor de San Simon
  • KTH Royal Institute of Technology
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Food Science
  • Organic Chemistry


  • AF4, Arabinogalactan, Asymmetric flow field-flow fractionation, Smallanthus sonchifolius, Yacon
Original languageEnglish
Pages (from-to)76-81
Number of pages6
JournalFood Chemistry
Publication statusPublished - 2017 May 15
Publication categoryResearch