49B-19 |
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M. D. S. Raymundo1, R. FETT1, R. B. Derner1, and P. Horta2. (1) Departamento de Cięncia e Tecnologia de Alimentos, Universidade Federal de Santa Catarina, Rodovia Admar Gonzaga, 1346, Florianopolis, 88040900, Brazil, (2) Departamento de Botanica, Universidade Federal de Santa Catarina, Campus Universitário, Trindade, Florianopolis, 88040001, Brazil In the last years some studies searching for natural antioxidant compounds sources have been carried out. Aquatic and terrestrial plants contain metabolites, that among others functions, can act as antioxidant agent in nourishing products. The aim of this work was to study the antioxidant activity of ether and methanol extracts of three seaweeds species, Padina gymnospora (Kütz.) Sond, Dictyopteris delicatula Lamouroux and Sargassum stenophyllum (Phaeophyta) and quantify the phenolic compounds, chlorophyylls and carotenoids contents. The thiocyanate method was used to evaluate the inibition of the lipid peroxidation. The quantification of algals pigments (chlorophylls and carotenoids) and phenolic compounds were make in spectrophotometer. All the extracts had presented antioxidant activity with different efficiencies in the tested lipid system. The methanol extract of the Padina gymnospora species contained high phenolic compounds amount, suggesting that this extract can contain reducing substances. The antioxidant activity were (66,45 ± 0,86)% and (84,47 ± 0,50)% for the P. gymnospora; (43,25 ± 1,45)% and (74,02 ± 1,19)% for D. delicatula; and (57,83 ± 0,96)% and (65,34 ± 1,79)% for S. stenophyllum for ether and methanolic extracts, respectively. The phenolic content, determined according Folin-Ciocalteu method, were (798,65 ± 3,62)mg/100g in dry sample, (460, 83 ± 5,42)mg/100g and (828,19 ± 3,93)mg/100g for the P. gymnospora, D. delicatula and S. stenophyllum, respectively. The chrorophylls and carotenoids contents, in dry sample, respectively, were (513,68 ± 29,42; 194,74 ± 1,97)mg/kg for the P. gymnospora; (103,52 ± 0,85; 13,77 ± 1,86)mg/kg for D.delicatula and (374,89 ± 11,08; 97,54 ± 3,37)mg/kg for S. stenophyllum. The results suggest that phenolic compounds are the major contributors to antioxidative activities of the seaweeds tested. Its natural sources of antioxidants compounds are inexploted today, but with very potential for food, through the diet or ingestion of supplements, and pharmaceutical industries.
Session 49B, Aquatic Food Products: General
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