糜子壳油超声辅助提取工艺优化及脂肪酸组成分析

以正己烷为提取溶剂,在超声波功率、液料比、提取时间以及提取温度等单因素试验基础上,通过响应面法优化糜子壳油超声辅助提取的最佳参数。结果表明,最佳工艺条件为超声波功率400W,液料比12∶1(mL/g),提取温度70℃,提取时间50min,该条件下糜子壳油得率可达到6.95%。经气相色谱(GC)法分析鉴定出5种脂肪酸,分别为亚油酸(70.10%)、油酸(20.00%)、棕榈酸(8.79%)、亚麻酸(0.89%)和花生一烯酸(0.21%)。

Optimization of ultrasonic-assisted extraction process and analysis of fatty acid composition of Panicum miliaceum L. shell oil

The n-hexane was used as extraction solvent,and the ultrasonic-assisted extraction parameters of Panicum miliaceum L.shell oil were optimized by response surface methodology based on the single factor experiment of ultrasonic power,liquid-solid ratio,extraction time and extraction temperature.The results showed that the optimum extraction parameters were as follows:the ultrasonic power was 400 W,the liquid-solid ratio was 12∶1(mL/g),the extraction temperature was 70℃,and the extraction time was 50 min,and the yield of Panicum miliaceum L.shell oil reached 6.95% under the optimal condition.Five kinds of fatty acids were identified by GC,the main fatty acids of Panicum miliaceum L.shell oil were linoleic acid(70.10%),oleic acid(20.00%),palmitic acid(8.79%),linolenic acid(0.89%)and eicosenoic acid(0.21%),respectively.