超临界CO_2萃取_精馏小米糠油_魏福祥.pdf

78 2011, Vol. 32, No. 08 食品科学 ※工艺技术 超临界CO2 萃取- 精馏小米糠油 魏福祥，李世超，王浩然，马晓珍，雷立改 (河北科技大学环境科学与工程学院，河北石家庄 0500 18) 摘 要：采用超临界CO2 萃取- 精馏技术从小米细糠中提取小米糠油。研究萃取压力、萃取温度、萃取时间、CO2 流量对出油率的影响，以及压力、温度对精馏的影响。结果表明：在萃取压力3 0M P a 、萃取温度4 5 ℃、萃取 时间2h 、CO2 流量50kg/h 的萃取条件下小米糠粗油的出油率可达19.69% 。在精馏柱压力10MPa、4 个精馏柱温度 分别为4 0 、4 5 、50 、5 5 ℃条件下，对粗油进行精馏得到小米糠精油。通过检测，超临界萃取法提取的小米糠 油含有较高的不饱和脂肪酸，尤其是含有高达67 .8% 的亚油酸，且各项理化指标均优于市售小米糠油。 关键词：小米糠油；超临界C O2 ；萃取- 精馏 Extraction and Rectification of Millet Bran Oil with Supercritical Fluid Caron Dioxide WEI Fu-xiang ，LI Shi-chao ，WANG Hao-ran ，MA Xiao-zhen ，LEI Li-gai (College of Environmental Science and Engineering, Hebei University of Science and Technology, Shij iazhuang 0500 18, China) Abstract：Millet bran oil was extracted and rectified with supercritical fluid carbon dioxide (SFCO2). In the extraction, pressure, temperature, length of extraction time and CO2 flow rate were optimized by orthogonal array design, and the influences of pressure and temperature on the rectification of millet bran oil were analyzed. The results showed that the optimal condition s for the extraction of millet bran oil were as follows: extraction at 45 ℃for 2 h under 30 MPa with a CO2 flow rate of 50 kg/h, the resultant oil yield was up to 19.69% under these conditions, and the optimum rectification conditions were 10 MPa column pressure and the temperatures of 40, 45, 50 ℃and 55 ℃for four sequential columns. The millet bran oil prepared in this study contained a relatively large amount of un saturated fatty acids, especially linoleic acid up to 67.8%, and had better physical and chemical indexes in comparison with commercial ones. Key words ：millet bran oil ；supercritical CO2 ；