Impact of drying on the sodium alginate obtained after polyphenols ultrasound-assisted extraction from Ascophyllum nodosum seaweeds
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Título: | Impact of drying on the sodium alginate obtained after polyphenols ultrasound-assisted extraction from Ascophyllum nodosum seaweeds |
Autor/a: | Montes, Leticia Gisbert Verdú, Mauro Hinojosa, Ignacio Sineiro Torres, Jorge Moreira Martínez, Ramón Felipe |
Centro/Departamento: | Universidade de Santiago de Compostela. Departamento de Enxeñaría Química |
Palabras chave: | FT-IR | NMR | Rheology | UAE | Viscosity average molecular weight | |
Data: | 2021 |
Editor: | Elsevier |
Cita bibliográfica: | Carbohydrate Polymers 272 (2021) 118455 |
Resumo: | Ultrasound-assisted extraction (UAE) of polyphenols from the brown seaweeds Ascophyllum nodosum leaves a solid phase where alginates can be extracted. This study characterizes alginates extracted after the UAE process, with and without an intermediate drying stage at different temperatures (50 and 90 °C) producing sequentially two bioactive compounds from a unique raw material. FT-IR and 1H NMR analyses showed the high purity of alginates with features in the range of commercial alginates. Drying at high temperature decreased average block length and viscosity average molecular weight (Mv) of alginate from 428 to 133 kg/mol. Steady-shear curves (shear-thinning behaviour) and viscoelasticity (liquid like character) features depended clearly on Mv. Solutions of alginates with high Mv were more viscous and the elastic character was more relevant. Cox-Merz rule was only accomplished within the semi-dilute regimes of alginate concentration. Tested process conditions allow the production of alginates with different properties |
Versión do editor: | https://doi.org/10.1016/j.carbpol.2021.118455 |
URI: | http://hdl.handle.net/10347/27529 |
DOI: | 10.1016/j.carbpol.2021.118455 |
E-ISSN: | 0144-8617 |
Dereitos: | © 2021 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/) |
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