| Summary: | 碩士 === 國立屏東科技大學 === 水產養殖系所 === 96 === The people has been eating seaweeds for a long time. In recent years, many marine resources have attracted attention in the search for bioactive compounds to develop antioxidants source. Seaweed extracts have biological activity of potential medicinal value, antioxidant activity and anticancer activity. This study of seaweeds were harvested from the Kenting Coral Reef area during October 2005 and March 2008. The fresh seaweeds were freeze-dried and then extract water soluble solution from seaweeds. Their antioxidant properties and antioxidant substance were also studied, which including reducing power, DPPH radical scavenging activity, superoxide anion scavenging activity, ferrous ion chelating activity, polyphenolics, polysaccharide, flavonoids, chlorophyll and carotenoid. Further analysis of their extracts antioxidant activity, with treatment of temperature and addition nutrients. Results showed that the Phaeophyta had the highest antioxidant activity. In the analysis of the substance with antioxidant activity, the content polyphenolics was in an order of 1.Phaeophyta, 2.Rhodophyta, 3.Chlorophyta, the content polysaccharide was in an order of 1.Rhodophyta,
2.Chlorophyta, 3.Phaeophyta, the content flavonoids was in an order of 1.Phaeophyta, 2.Chlorophyta, 3.Rhodophyta, the content chlorophyll was in an order of 1.Phaeophyta, 2.Chlorophyta, 3.Rhodophyta, and the content carotenoid was in an order of 1.Chlorophyta, 2.Phaeophyta, 3.Rhodophyta. On the other hand, that the temperature and nutrients would significantly affect antioxidant activity and antioxidant substance content of seaweeds. In summary, seaweeds have a higher antioxidant activity and seaweed extracts can be developed as a potential for healthy foods.
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