Retrieving of high-value biomolecules from edible Himanthalia elongata brown seaweed using hydrothermal processing
2019
Cernadas, Héctor | Flórez-Fernández, Noelia | González Muñoz, María Jesús | Domínguez González, Herminia | Torres París, Ma. Dolores
The recovery of bioactive and biopolymer-based compounds from Himantalia elongata brown seaweed was studied using a hydrothermal treatment operating under non-isothermal conditions in a broad temperature range (120–220°C). Maximum extraction yields were observed at 180°C, since up to 70.7% dry basis (d.b.) of the initial biomass was solubilized. Initial raw material was chemically characterized. The highest crude fucoidan obtained by hydrothermal extraction was achieved at 160°C. Maximal sulfate and phlorotannin content in the soluble fraction was obtained under non-isothermal autohydrolysis at 160°C and at 220°C, respectively. Both extracts showed cytotoxic effects against lung, ovarian and breast carcinoma cells, achieve the half maximal inhibitory concentration to 1.31±0.98mg/mL of autohydrolysis extract at 220°C for ovarian cell line tested. The mildest processing condition with suitable bioactive properties (160°C) was selected to assess the precipitated alginate features in terms of rheological properties, following a biorefinery approach.
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