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

Abstract : 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.
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Submitted on : Wednesday, July 18, 2018 - 2:03:32 PM
Last modification on : Wednesday, May 15, 2019 - 4:12:13 AM

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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, Elsevier, 2018, 118 (1073-1081), ⟨10.1016/j.ijbiomac.2018.06.154⟩. ⟨hal-01843025⟩

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