Abstract
In vitro antioxidant activity of methanolic (ME) and ethanolic (ET) extracts of six species of seaweeds (Cystoseira stricta, Cystoseira compressa, Corallina elongata, Porphyra umbilicalis, Enteromorpha compressa and Ulva lactuca) collected from Algerian West Coast was evaluated, using 1,1-diphenyl-2-picryl-hydrazyl (DPPH) radical scavenging assay and reducing power assay. They were tested for total phenolic content. The highest phenolic content was observed in C. compressa [10.24 ± 0.09 mg gallic acid equivalent (GAE) g-1 dry weight (DW) in ME extract and 15.70 ± 0.72 mg GAE g-1 DW in ET extract]. In general, the ET seaweed extracts were the most effective fractions. In addition, C. compressa and C. stricta extracts showed the highest antioxidant activity in all assays and better than vitamin E. However, these extracts present lower DPPH radical scavenging activity and reducing power than butylhydroxytoluene (BHT), except at concentration of 1 mg mL-1, in which it was similar. Therefore, C. compressa and C. stricta had a potential to be used as a natural antioxidant agent. Key words: Algerian, antioxidant activity, 1,1-diphenyl-2-picryl-hydrazyl (DPPH) radical scavenging, reducing power, seaweed.
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