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Type: Journal article
Title: Multi-scale assembly of hydrogels formed by highly branched arabinoxylans from Plantago ovata seed mucilage studied by USANS/SANS and rheology
Author: Yu, L.
Yakubov, G.
Gilbert, E.
Sewell, K.
van de Meene, A.
Stokes, J.
Citation: Carbohydrate Polymers, 2019; 207:333-342
Publisher: Elsevier
Issue Date: 2019
ISSN: 0144-8617
Statement of
Long Yu, Gleb E. Yakubov, Elliot P. Gilbert, Kim Sewell, Allison M.L. van de Meene, Jason R. Stokes
Abstract: The structures of two hydrogels formed by purified brush-like polysaccharides from Plantago ovata seed mucilage have been characterised from the nanometre to micrometre scale by using a combination of SANS and USANS techniques. These two hydrogels have distinctly different melting and rheological properties, but the structure of their gel networks bears striking similarity as revealed by USANS/SANS experiments. Surprisingly, we find that the dramatic changes in the rheological properties induced by temperature or change in the solvent quality are accompanied by a small alteration of the network structure as inferred from scattering curves recorded above melting or in a chaotropic solvent (0.7 M KOD). These results suggest that, in contrast to most gel-forming polysaccharides for which gelation depends on a structural transition, the rheological properties of Plantago ovata mucilage gels are dependent on variations in intermolecular hydrogen bonding. By enzymatically cleaving off terminal arabinose residues from the side chains, we have demonstrated that composition of side-chains has a strong effect on intermolecular interactions, which, in turn, has a profound effect on rheological and structural properties of these unique polysaccharides.
Keywords: Arabinoxylans; hydrogel; structure; Plantago ovata; SANS; USANS; rheology
Rights: © 2018 Elsevier Ltd. All rights reserved.
RMID: 0030105889
DOI: 10.1016/j.carbpol.2018.11.098
Grant ID:
Appears in Collections:Agriculture, Food and Wine publications

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