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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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Verfasserangaben:Thierry Hellebois, Jennyfer FortuinORCiD, Xuan Xu, Alexander S. Shaplov, Claire Gaiani, Christos Soukoulis
URN:urn:nbn:de:hbz:tr5-1775
DOI:https://doi.org/10.1016/j.ijbiomac.2021.10.087
Titel des übergeordneten Werkes (Englisch):International Journal of Biological Macromolecules
Verlag:Elsevier
Dokumentart:Wissenschaftlicher Artikel (Fachzeitschriften)
Sprache:Englisch
Datum des OPUS-Uploads:15.11.2022
Datum der Erstveröffentlichung:22.10.2021
Veröffentlichende Hochschule:Hochschule Trier
Datum der Freischaltung:15.11.2022
Freies Schlagwort / Tag:flaxseed mucilage; rheological behaviour; structure conformation properties
GND-Schlagwort:Flachs; Leinsamen; Pflanzlicher Schleim; Gummi; Gummiherstellung
Jahrgang:192
Seitenzahl:14
Erste Seite:1217
Letzte Seite:1230
Einrichtungen:FB Bauen + Leben
DDC-Klassifikation:6 Technik, Medizin, angewandte Wissenschaften / 66 Chemische Verfahrenstechnik
Lizenz (Deutsch):License LogoCreative Commons - CC BY - Namensnennung 4.0 International