Antioxidant potential of two red seaweeds from the Brazilian coasts
2011
Cerqueira, M. A. | Martins, J. T. | Quintas, Mafalda A. C. | Ferreira, António C. | Teixeira, J. A. | Vicente, A. A. | Souza, B. W. S.
In this work, in vitro antioxidant activity of two Brazilian red seaweeds, Gracilaria birdiae and Gracilaria cornea, wascharacterized. The total phenolic content, the radical-scavenging activity and the antioxidant activity were determined in two solventextracts of the algae. Liquid chromatography mass spectrometry (LC MS/MS) allowed identification of important antioxidantcompounds. 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 0.76mgmL 1, respectively, while formethanolic extracts, theIC50 values of G. cornea and G. birdiae were 0.86 and 0.76mgmL 1, respectively. The antioxidant activities of these two seaweeds’ extracts asassessed by the ß-carotene linoleic acid assay were equally high, achieving values of ß-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.
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