碩士 / 國立臺灣海洋大學 / 食品科學系 / 99 / The proximate composition of seagrape (Caulerpa lentillifera) from culture ponds in Penghu, Taiwan was analyzed. The phenolic content and the antioxidant activities including the DPPH radical scavenging activity, ferric ion reducing activity, hydrogen peroxide scavenging activity and ferrous ion chelating activity of the ethanolic extracts of dry seagrape samples using two drying methods of freeze drying and thermal drying were compared with the ethanolic extract of Oolong tea as a reference. The seagrape had high salt and moisture contents (4.0 and 94.28% fresh weight, respectively). The contents (dry weight basis) of carbohydrate, crude protein, crude lipid, crude fiber, and ash of seagrape obtained from culture ponds in Taiwan were 63.99%, 9.27%, 1.57%, 2.97% and 22.20%, respectively. The total phenolic content (1.30 mg GAE/g dry weight) of the ethanolic extract of thermally dried seagrape was significantly lower (p<0.05) than that (2.04 mg GAE/g dry weight) of freeze dried seagrape, and both were significantly lower than that (13.58 mg GAE/g dry weight) of Oolong tea. At the same phenolic content, the antioxidant activities of freeze dried seagrape were significantly higher (p<0.05) than those of thermally dried seagrape. Compared with Oolong tea, seagrape, irrespective of drying method used, generally had strong hydrogen peroxide scavenging activity; but it was weak in DPPH radical scavenging activity, ferric ion reducing activity and ferrous ion chelating activity. The antioxidant activity of seagrape and Oolong tea were significantly influenced by their phenolic contents.
| Identifer | oai:union.ndltd.org:TW/099NTOU5253006 |
| Date | January 2011 |
| Creators | Nguyen Van Tang, 阮文送 |
| Contributors | Guo Jane Tsai, 蔡國珍教授 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 54 |
Page generated in 0.0011 seconds