Total phenolic compounds,radical scavenging and metal chelation of extracts from Icelandic seaweeds |
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Authors: | Tao Wang Rósa Jónsdóttir Guðrún Ólafsdóttir |
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Affiliation: | 1. Department of Food Science and Nutrition, Faculty of Science, University of Iceland, Hjardarhagi 2-6, 107 Reykjavik, Iceland;2. Matís ohf., Food Research, Innovation and Safety, Biotechnology and New Products, Skulagata 4, 101 Reykjavik, Iceland;3. Faculty of Food Science and Engineering, Dalian Fisheries University, Heishijiao 52, 116023 Dalian, China;4. Syni Laboratory Service, Lyngháls 3, 110 Reykjavík, Iceland |
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Abstract: | Screening of potential antioxidant activities of water and 70% acetone extracts from ten species of Icelandic seaweeds was performed using three antioxidant assays. Significant differences were observed both in total phenolic contents (TPC) and antioxidant activities of extracts from the various species evaluated using 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity, oxygen radical absorbance capacity (ORAC) and ferrous ion-chelating ability assays. Acetone extracts from three Fucoid species had the highest TPC and consequently exhibited the strongest radical scavenging activities. High correlation was found between TPC of seaweed extracts and their scavenging capacity against DPPH and peroxyl radicals, indicating an important role of algal polyphenols as chain-breaking antioxidants. However, water extracts generally had higher ferrous ion-chelating activity than 70% acetone extracts and no correlation was found with their TPC, suggesting that other components such as polysaccharides, proteins or peptides in the extracts were more effective chelators of ferrous ions than phenolic compounds. |
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Keywords: | Icelandic seaweeds Total phenolic contents (TPC) Antioxidant activity DPPH radical scavenging activity ORAC Ferrous ion-chelating ability Multivariate data analysis |
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