Structure conformation, physicochemical and rheological properties of flaxseed gums extracted under alkaline and acidic conditions

  • The present work aimed at investigating an extraction protocol based on consecutive steps of isoelectric point (pH ~ 4.25) mediated gum swelling and deproteinisation as an alternative method to produce flaxseed gum extracts of enhanced techno-functional characteristics. The osidic and proximate composition, structure conformation, flow behaviour, dynamic rheological and thermal properties of gums isolated from brown and golden flaxseeds were assessed. Gum extraction under near-to-isoelectric point conditions did not impair the extraction yield, residual protein and ash content, whilst it resulted in minor changes in the sugar composition of the flaxseed gum extracts. The deconvolution of the GPC/SEC chromatographs revealed the presence of four major polysaccharidic populations corresponding to arabinoxylans, rhamnogalacturonan–I and two AX-RG-I composite fractions. The latter appeared to minimise the intra- and interchain polymer non-covalent interactions (hydrogen bonding) leading to a better solvation affinity in water and lyotropic solvents. Golden flaxseed gums exerted higher molecular weight (Mw = 1.34–1.15 × 106 Da) and intrinsic viscosities (6.63–5.13 dL g−1) as well as better thickening and viscoelastic performance than the brown flaxseed gum exemplars. Golden flaxseed gums exhibited a better thermal stability compared to the brown flaxseed counterparts and therefore, they are suitable for product applications involving severe heat treatments.

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Author:Thierry Hellebois, Jennyfer Fortuin, Xuan Xu, Alexander S. Shaplov, Claire Gaiani, Christos Soukoulis
Parent Title (English):International Journal of Biological Macromolecules
Document Type:Article (specialist journals)
Date of OPUS upload:2022/11/15
Date of first Publication:2021/10/22
Publishing University:Hochschule Trier
Release Date:2022/11/15
Tag:flaxseed mucilage; rheological behaviour; structure conformation properties
GND Keyword:Flachs; Leinsamen; Pflanzlicher Schleim; Gummi; Gummiherstellung
Page Number:14
First Page:1217
Last Page:1230
Departments:FB Bauen + Leben
Dewey Decimal Classification:6 Technik, Medizin, angewandte Wissenschaften / 66 Chemische Verfahrenstechnik
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International