Polyphenols extraction kinetics from Ascophyllum nodosum seaweed employing water and saltwater: Effect of ultrasound sonication

Saltwater (S), with the same ionic strength of seawater, was employed as solvent to extract polyphenols from seaweeds. Aqueous extracts were chemically characterized by means total (TPC), carbohydrates (CHOS) and uronic acids (UA) content antioxidant capacities (DPPH, ABTS FRAP). S-extracts showed lower TPC than those obtained distilled water (D) using two different extraction methods, conventional solid-liquid (SLE) ultrasound-assisted (UAE). The both non-sonicated did not show significant (p < 0.05) differences. SLE kinetics employing solvents (D S) successfully modelled Peleg's model, equilibria achieved after 15 min. Long-time UAE (15 min) increased phytochemical in D- respect SLE. Extracts three main (A, B, C) regions RP-HPLC profiles peak areas shapes. Normalized related activities linear regressions that B-region responsible features extracts. saltwater promoted leaching other compounds (mainly proteins) formed intermolecular complexes. These interactions notoriously diminished UAE. At these conditions, can be eco-friendly according green chemistry principles.