engleski

Biological potential of three Adriatic brown seaweeds

Marine organisms are a rich natural resource of many biologically active compounds. Among them, seaweeds are well known as an excellent source of phytochemicals with good biological activities. Although exposed to high oxidative living environment, seaweeds suffer no oxidation damage, which suggest that their cells have antioxidant defense system. So far there has been no investigation in Adriatic Sea, thus this study presents first results on biological potential of three Adriatic brown seaweeds from the Phaeophyceae class. The research included Adriatic marine algae extracts of Padina pavonica (Linnaeus) Thivy, Cystoseira amentacea var. stricta Montagne and Cystoseira compressa (Esper) Gerloff & Nizamuddin. The total phenolic content in seaweed extracts was determinated by Folin-Ciocalteu method. As one antioxidant, method cannot fully describe the antioxidant activity of the samples ; for the full evaluation of the antioxidant potential, multiple method approach was necessary. Therefore, we have measured the antioxidant activity by employing few methods, based on the different reaction mechanisms (ferric reducing antioxidant power (FRAP), scavenging of the stabile 2, 2-diphenyl-1-picrylhydrazyl (DPPH) radical, Briggs-Rauscher (BR) oscillating reaction, etc.). Extract of C. amentacea was superior in comparison to other two extracts in both phenolics and related antioxidant efficiency. The total phenolic content in extract from this specie was 785 mg GAE/L, while other two extracts contained almost 8-fold (P. pavonica) and 10-fold (C. copressa) lower amounts. Similar results were obtained for antioxidant activities: reducing activity by FRAP method, as well as for free radical scavenging activity using DPPH radical, while in Briggs-Rauscher method extracts of P. pavonica and C. copressa did not show any activity. The obtained results emphasize C. amentacea seaweed as a potentially good source of biologically active compounds and open the numerous possibilities of its use in food, cosmetic and/or pharmaceutical industry.

Padina pavonica ; Cystoseira amentacea ; Cystoseira compressa ; phenolics ; antioxidant activity

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