RT Journal Article
T1 Impact of drying on the sodium alginate obtained after polyphenols ultrasound-assisted extraction from Ascophyllum nodosum seaweeds
A1 Montes, Leticia
A1 Gisbert Verdú, Mauro
A1 Hinojosa, Ignacio
A1 Sineiro Torres, Jorge
A1 Moreira Martínez, Ramón Felipe
K1 FT-IR
K1 NMR
K1 Rheology
K1 UAE
K1 Viscosity average molecular weight
AB 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
PB Elsevier
YR 2021
FD 2021
LK http://hdl.handle.net/10347/27529
UL http://hdl.handle.net/10347/27529
LA eng
NO Carbohydrate Polymers 272 (2021) 118455
DS Minerva
RD 27 abr 2026