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Asymmetrical flow field-flow fractionation enables the characterization of molecular and supramolecular properties of cereal beta-glucan dispersions

Författare

Summary, in English

In this paper we study the properties of molecular and supra molecular species in cereal beta-glucan solutions/dispersions by the utilization of asymmetrical flow field-flow fractionation coupled to multi-angle light scattering and refractive index (AsFlFFF-MALS-RI) detectors. The samples were purified barley and oat beta-glucans which were dissolved in aqueous solution using either mild conditions or more harsh treatments with alkali. Dissolution in 0.5 M NaOH was not sufficient to eliminate aggregated structures in barley beta-glucan. The results in this paper show how distinction can possibly be made between molecular and supra molecular species using scaling approaches and conformational parameters obtained from AsFlFFF-MALS-RI over the entire size distribution. Small species in the barley beta-glucan samples display properties ranging from elongated conformation to random coil conformation. Aggregates have

low apparent densities and a swollen micro gel structure. Oat beta-glucan displays no properties that can be attributed to a molecularly dissolved beta-glucan showing that dissolution was incomplete. The aggregate properties analyzed were similar between oat and barley beta-glucan.

Avdelning/ar

Publiceringsår

2012

Språk

Engelska

Sidor

518-523

Publikation/Tidskrift/Serie

Carbohydrate Polymers

Volym

87

Issue

1

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Food Engineering
  • Biochemistry and Molecular Biology

Nyckelord

  • Beta-glucan Asymmetrical flow field-flow fractionation AF4 Oat Barley

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0144-8617