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| 新疆打瓜籽油中亚油酸的尿素包合纯化工艺研究 |
| Purification of linoleic acid in Xinjiang seeding-watermelon seed oil by urea adduction |
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| DOI： |
| 中文关键词: 打瓜籽油 亚油酸 尿素包合 气相色谱 |
| 英文关键词:seeding-watermelon seed oil linoleic acid urea adduction gas chromatography |
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| 中文摘要: |
| 采用尿素包合法纯化新疆打瓜籽油中的亚油酸，以产物的碘值和得率为评价指标，在单因素试验的基础上，对纯化工艺进行Box-Behnken 响应面试验优化。结果表明，最优的纯化工艺条件为包合时间13 h、包合温度4 ℃、95%乙醇与尿素体积质量比4∶ 1、尿素与混合脂肪酸质量比3∶ 1，在最优工艺条件下产物的碘值（I）为146.14 g/100 g，得率为46.55%。采用气相色谱对产物进行脂肪酸组成分析发现，经过尿素包合后，绝大多数的饱和脂肪酸被除去，亚油酸含量明显升高，由原来的72.910%上升到97.249%。 |
| 英文摘要: |
| The linoleic acid in Xinjiang seeding-watermelon seed oil was purified by urea adduction.With the iodine value and yield of the product as evaluation indexes, the Box-Behnken response surface methodology was used to optimize the process on the basis of single factor experiment,and the optimal purification conditions were obtained as follows: adduction time 13 h, adduction temperature 4 ℃, ratio of volume of ethanol to mass of urea 4∶ 1, and mass ratio of urea to mixed fatty acids 3∶ 1.Under the optimal conditions, the iodine value of the product was 146.14 gI/100 g and the yield was 46.55%. The fatty acid composition of the product was analyzed by gas chromatography,and it was found that most of the saturated fatty acids had been removed after urea adduction and the content of linoleic acid increased significantly from 72.910% to 97.249%. |
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