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Algae > Volume 20(3); 2005 > Article
Algae 2005;20(3): 251-260. doi: https://doi.org/10.4490/algae.2005.20.3.251
Antioxidant Activities of Chlorophyta and Phaeophyta from Jeju Island
Soo-Jin Heo, Sun-Heui Cha, Ki-Wan Lee, Somi K. Cho1, You-Jin Jeon*
Faculty of Applied Marine Science,
1Faculty of Biotechnology, Cheju National University, Jeju 690-756, Korea
Antioxidative activities of Chlorophyta and Phaeophyta in Jeju Island were measured by superoxide anion (O2 ·?), hydroxyl radical (HO·), hydrogen peroxide (H2O2) and DPPH free radical scavenging assays. Methanolic and aqueous extracts of the seaweeds were prepared at both temperatures, higher (70°C) and room temperature (20°C), and screened for the construction of an extract bank from seaweeds in Jeju Island. A variety of extracts showed positive effect against reactive oxygen species (ROS). Especially, Sargassum thunbergii methanolic extract at 70°C (70ME, 97.41%), S. fulvellum methanolic extract at 20°C (20ME, 84.66%), Codium fragile aqueous extract at 70°C (70AE, 96.61%) and S. thunbergii 20ME (97.44%) exhibited the highest scavenging activities against O2 ·?, HO·, H2O2 and DPPH free radicals, respectively. Total phenolic contents also examined but did not show a positive correlation with ROS scavenging abilities (except for a few extracts). These results indicate that further investigation is needed to identify and purify the responsible antioxidative components.
Key words: antioxidant, aqueous extract, methanolic extract, ROS, seaweeds

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