Antioxidant potential of two red seaweeds from the Brazilian coasts

Bartolomeu W. S. Souza, Miguel A. Cerqueira, Joana T. Martins, Mafalda A. C. Quintas, António C. S. Ferreira, José A. Teixeira, António A. Vicente

Research output: Contribution to journalArticlepeer-review

95 Citations (Scopus)

Abstract

In this work, in vitro antioxidant activity of two Brazilian red seaweeds, Gracilaria birdiae and Gracilaria cornea, was characterized. The total phenolic content, the radical-scavenging activity and the antioxidant activity were determined in two solvent extracts of the algae. Liquid chromatography-mass spectrometry (LC-MS/MS) allowed identification of important antioxidant compounds. The ethanol extract of G birdiae was found to have the highest value of total phenolic content: 1.13 mg of gallic acid equiv (GAE)/g of extract. The radical-scavenging activity of G. birdiae and G cornea extracts has been evaluated at different extract concentrations; the IC50 values of ethanolic extracts of G cornea and G birdiae were 0.77 and 0.76 mg mL, respectively while for methanolic extracts, the IC50 values of G cornea and G birdiae were 0.86 and 0.76 mg mL-1, respectively. The antioxidant activities of these two seaweeds' extracts as assessed by the β-carotene-linoleic acid assay were equally high, achieving values of β-carotene oxidation inhibition of up to 40%. Finally, in the methanolic extracts, LC-MS/MS allowed identification in both algae of two important antioxidants: apigenin and gallic acid.
Original languageEnglish
Pages (from-to)5589-5594
Number of pages6
JournalJournal of Agricultural and Food Chemistry
Volume59
Issue number10
DOIs
Publication statusPublished - 25 May 2011

Keywords

  • Antioxidant
  • Phenolic content
  • Seaweeds

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