Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/3640
標題: 應答曲面設計的超臨界二氧化碳萃取米糠醇油程序
Designed Supercritical Carbon Dioxide Extraction of Oryzanols Contained Rice Bran Oil Using Response Surface Methodology
作者: 王志宏
Wang, Chih-Hung
關鍵字: Supercritical carbon dioxide;超臨界二氧化碳萃取;rice bran;rice bran oil;gamma-oryzanols;free fatty acid;triglycerides;米糠油;米糠醇;游離脂肪酸
出版社: 化學工程學系所
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摘要: 
本研究探討超臨界二氧化碳萃取米糠油程序,並以油中的米糠醇、游離脂肪酸與三酸甘油酯含量變化作為指標,探討操作溫度、操作壓力、流速大小、填物料多寡、二氧化碳流向與用量對各油成份萃取效率的影響。再以應答曲面設計法,找出超臨界二氧化碳壓力與溫度對米糠油產率,米糠醇(Oryzanols)、游離脂肪酸(FFA)、三酸甘油酯(TG)的萃取效率與油中各成份濃縮倍數(βory、βFFA、βTG)應答值的影響。應答實驗結果發現,以10克物料與1:120溶固比,底向流二氧化碳在350bar與313K萃取時,可得17.5%米糠油產率,三類成份的濃縮倍數值均與索式正己烷濃縮係數相當。以35克物料與1:70溶固比,頂向流二氧化碳在300bar與313K萃取時,可萃出最佳17.6%米糠油產率,且三類的濃縮倍數值均大於索式正己烷者。
顯示出頂向流萃取能夠減少二氧化碳用量與降低萃取壓力。依此結果,頂向流超臨界二氧化碳萃取程序優於底向流超臨界二氧化碳萃取程序。在以油產率數據來看,超臨界二氧化碳萃取米糠油時,在實驗壓力250~350bar與溫度範圍313K~333K內,油產率會有交錯現象產生。在溫度313K時,萃取動力曲線顯示,油中成份含量,隨著壓力增加而增多。且當壓力大於250bar時,游離脂肪酸含量不在增加。

This study examined effects of temperature, pressure, solvent flow rate and the ratio of solvent to solid on suspercritical carbon dioxide extraction of rice bran oil from powdered rice bran. Total yield of oil, extraction efficiencies and concentraction factors of oryzanols, free fatty acid and triglycerides were determined. Response surface methodology (RSM) designed suspercritical carbon dioxide extractions with pressure ranged from 250bar to 350bar and temperature ranged from 313K to 333K were then carried out to determine these two factors on those responded parameters.
Down-flow suspercritical carbon dixoide extraction at 350bar and 313K resulted in 17.5% of oil yield, which is 87.5% of that by N-hexane extraction. Those concentration factors of oryzanols, free fatty acid and triglycerides were equal to those of soxhlet hexane extraction. Up-flow suspercritical carbon dixoide extraction at 300bar and 313K yielded 17.6% of oil. However, those concentration factors of oryzanols, free fatty acid and triglycerides were more than those of soxhlet hexane extraction. Both RSM studies of down-flow and up-flow supercritical carbon dioxide extractions indicated that pressure presents more effectives than temperature on enhancing the extraction efficiency of oil components. Using up-flow supercritical carbon dioxide extraction of rice bran oil, crossover pressure at 275bar was found in this study.
URI: http://hdl.handle.net/11455/3640
其他識別: U0005-2408200711244100
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