以亚麻籽油为原料,采用干法分提对其进行了分离改性,进一步分离出富含高不饱和脂肪酸的亚麻籽油.研究了搅拌速率、冷却速率、养晶时间、结晶温度对亚麻籽油液态油得率、碘值的影响.得到最佳的工艺条件为:搅拌速率15 r/min,冷却速率4℃/h,养晶时间12h,结晶温度-8℃.在最佳工艺条件下所得液态油碘值(Ⅰ)为198 g/l00 g,液态油得率为89.2％.通过分析样品油与成品油的脂肪酸组成、含量和0℃固体脂肪含量发现,成品油的饱和脂肪酸和固体脂肪含量较样品油明显降低.%Flaxseed oil was separated and modified by dry fractionation,and flaxseed oil with high unsaturated fatty acids was obtained.The effects of stirring rate,cooling rate,crystallization time and crystallization temperature on yield and iodine value of liquid flaxseed oil were researched.The optimal dry fractionation conditions were obtained as follows:stirring rate 15 r/min,cooling rate 4℃/h,crystallization time 12 h and crystallization temperature-8 ℃.Under these conditions,the iodine value and the yield of liquid oil were 198 gI/100 g and 89.2％ respectively.The fatty acid compositions and contents and the solid fat contents at 0 ℃ of the sample oil and the product oil were compared and analyzed.The contents of saturated fatty acids and solid fat in product oil were significantly lower than those in sample oil.
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