Retrieving of high-value biomolecules from edible Himanthalia elongata brown seaweed using hydrothermal processing

• Published in: Food and bioproducts processing 2019-09, Vol.117, p.275-286
• Main Authors: Cernadas, Héctor, Flórez-Fernández, Noelia, González-Muñoz, María Jesús, Domínguez, Herminia, Torres, María Dolores
• Format: Article
• Language: English
• Subjects: Algae; Alginates; Alginic acid; Biological activity; Biomass; Biomolecules; Biopolymers; Biorefineries; Breast carcinoma; Cytotoxicity; Elongation; Fucoidan; Hydrothermal treatment; Lung carcinoma; Lungs; Neoplasms; Ovaries; Properties; Raw materials; Rheological properties; Rheology; Seaweed meal; Seaweeds; Sulfates
• ISSN: 0960-3085
• DOI: 10.1016/j.fbp.2019.07.015

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 ± 0.98 mg/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.