| 研究生: |
吳俊毅 Wu, Chun-Yi |
|---|---|
| 論文名稱: |
以超臨界二氧化碳萃取海豹油之研究 Study on Extraction of Seal Oil with Supercritical Fluid Carbon Dioxide |
| 指導教授: |
葉茂榮
Yeh, Mou-Yung |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 化學系 Department of Chemistry |
| 論文出版年: | 2003 |
| 畢業學年度: | 91 |
| 語文別: | 中文 |
| 論文頁數: | 110 |
| 中文關鍵詞: | 海豹油 、超臨界二氧化碳 |
| 外文關鍵詞: | seal oil, supercritical carbon dioxide |
| 相關次數: | 點閱:52 下載:2 |
| 分享至: |
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最近二十年來,醫學上開始注意和研究海豹油對人類的生長,健康以及疾病的影響和作用,包括在解決一些疑難病症中的功效。經過研究證明,海豹油中存在著大量的Omega 3脂肪酸,對防止和治療各種心腦血管疾病和高血壓病極有幫助,具營養滋補和醫用價值。一般來說富含多元不飽和脂肪酸的油脂通常對熱敏感,而且氧化安定性不佳,而超臨界二氧化碳的操作條件溫度適中且可避免氧化,為適合對多元不飽和脂肪酸之油脂加工。
本文研究分兩部分,第一部分是利用超臨界二氧化碳萃取技術處理海豹原油,希望能藉此達到精製海豹油之目的,並將超臨界二氧化碳精製之油品進行各項指標分析。結果顯示雖然萃出率很低,但經超臨界二氧化碳萃取所得的殘留油在脫酸及脫臭上卻具有一定的效果,在脫色上則無明顯效果。而在脂肪酸組成方面,經萃取的殘留油的脂肪酸組成與原油比較並無改變,但殘留油中DHA及EPA的含量均會較原油含量略為提高。所以超臨界二氧化碳萃取海豹油的確可以達到一定精製的效果。
第二部分為將海豹原油甲酯化,首先探討不同酯化條件對海豹油轉酯化率的影響,結果發現鹼催化比酸催化的能力佳,在反應時間三十分鐘即可達到最佳萃出率。接著以此方法將海豹油酯化後進行超臨界二氧化碳萃取,發現萃出率提高許多;在反應條件為溫度40℃、壓力4000psi、靜態萃取時間30分鐘及二氧化碳用量為200NL時,平均萃出率可達到32.43%,DHA含量有17.37 mg/g,EPA含量為10.28 mg/g。
During the past two decades people have become interested in the potential biological activity of seal oils in the body growth and health, including as medical drugs to cure diseases. Seal oils are rich in omega-3 type polyunsaturated fatty acid(PUFA),which plays an important role in the prevention and as a potential drug to heart disease and hypertension .But the refinement of seal oils show some problems due to the potential oxidation of PUFA .The advantages of both operating at low temperature and anaerobic condition have made supercritical carbon dioxide(SC-CO2)tech- nology a very popular separation process.
The first purpose of this study was to refine the crude seal oil using SC-CO2 method .Crude oil was treated with SC-CO2 under various conditions. As the results it is effective in deacidifi- cation and deodorizerization. But it is not obvious in bleaching. The DHA and EPA content of the residual oil after SC-CO2 extraction was slightly higher than crude oil. This study showed that SC-CO2 refinement of seal oils had good oil quality and stability. The SC-CO2 extraction may have the potential as a refining process of the crude seal oil.
The second purpose was to extract the methylated seal oil by SC-CO2 .First we try to find the best transesterification process by changing different factors. Experimental results indicated base catalyst and the 30 min reaction time is the best process. Under the optimal conditions, at 40 ℃, 4000 psi and 30 min, there is the highest fatty acid methyl ester yield, and the DHA content is 17.37 mg/g, EPA content is 10.28 mg/g.
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