Extraction and characterization of an alginate from the Iranian brown seaweed Nizimuddinia zanardini

Roya Abka Khajouei , Javad Keramat , Nasser Hamdami , Alina-Violeta Ursu (1) , Cédric Delattre , Celine Laroche (2) , Christine Gardarin (1) , Didier Lecerf , Jacques Desbrieres (3) , Gholamreza Djelveh (1) , Philippe Michaud

1 IP - Institut Pascal
2 LPTHE - Laboratoire de Physique Théorique et Hautes Energies
3 IPREM - Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux

Sodium alginate from Nizimuddinia zanardini (an Iranian brown algae) was extracted with acid and alkaline solutions, partially and totally hydrolyzed and analyzed for its biochemical composition. 1H NMR spectroscopy, SEC-MALLS, HPAEC and FT-IR were performed to determine its structure and its physico-chemical properties. This alginate has a M/G ratio of 1.1, a molecular weight of 103 kDa, a polydispersity index of 1.22, and an intrinsic viscosity of 342 mL/g. Its antioxidant activity was tested by DPPH radical scavenging showing its potential for food preservation. Rheological properties of solutions of this alginate with concentrations between 1 and 5% (w/v) in water and 0.5 M NaCl were investigated indicating a Newtonian fluid type behaviour in water and a shear thinning fluid type behaviour in NaCl solutions.

Mots clés: Alginate; Antioxidant activity; Nizimuddinia zanardini; Polysaccharide

Domaines: Chimie théorique et/ou physique; Chimie analytique; Polymères; Matériaux

Roya Abka Khajouei, Javad Keramat, Nasser Hamdami, Alina-Violeta Ursu, Cédric Delattre, et al.. Extraction and characterization of an alginate from the Iranian brown seaweed Nizimuddinia zanardini. International Journal of Biological Macromolecules, 2018, 118 (1073-1081), ⟨10.1016/j.ijbiomac.2018.06.154⟩. ⟨hal-01843025⟩