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

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Characterization of a water soluble, hyperbranched arabinogalactan from yacon (Smallanthus sonchifolius) roots. / Castro, Alejandra; Vilaplana, Francisco; Nilsson, Lars.

I: Food Chemistry, Vol. 223, 15.05.2017, s. 76-81.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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T1 - Characterization of a water soluble, hyperbranched arabinogalactan from yacon (Smallanthus sonchifolius) roots

AU - Castro, Alejandra

AU - Vilaplana, Francisco

AU - Nilsson, Lars

PY - 2017/5/15

Y1 - 2017/5/15

N2 - 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).

AB - 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).

KW - AF4

KW - Arabinogalactan

KW - Asymmetric flow field-flow fractionation

KW - Smallanthus sonchifolius

KW - Yacon

UR - http://www.scopus.com/inward/record.url?scp=85006705583&partnerID=8YFLogxK

U2 - 10.1016/j.foodchem.2016.12.019

DO - 10.1016/j.foodchem.2016.12.019

M3 - Article

VL - 223

SP - 76

EP - 81

JO - Food Chemistry

JF - Food Chemistry

SN - 1873-7072

ER -