超声辅助超临界二氧化碳萃取紫苏籽油的工艺研究

Study on extraction of perilla frutescens seed oil by ultrasonic assisted supercritical carbon dioxide

选择乙酸乙酯为夹带剂,通过正交试验确定超声辅助超临界二氧化碳萃取紫苏籽油的最佳工艺条件。最佳工艺为超声时间25 min、超声水浴温度40℃、超声次数2次、萃取温度40℃、萃取时间3 h、萃取压力20 Pa,原料粒度40目。在此试验条件下,紫苏籽的出油率可达43.8%,相同条件下原料不进行超声预处理的紫苏籽出油率为39.7%,超声对原料进行预处理有利于提高紫苏籽油的出油率。

Chosen ethyl acetate as an entrainer,the optimum process conditions of ultrasonic pretreatment of Perilla seed were determined by orthogonal experiment. Then,the optimum process conditions of ultrasonic assisted supercritical carbon dioxide were determined by orthogonal experiment. The optimal extraction conditions were as follows：ultrasonic time of 25 min,ultrasonic temperature of 40 ℃,the ultrasonic of 2 times,extraction temperature of 40 oC,the extraction time of 3 h,extraction pressure of 20 Pa,and raw material granularity of 40 mesh. Under the experimental conditions,Perilla seed oil yield efficiency could reach 43.8%. Under the condition of the same material without ultrasonic pretreatment of Perilla seed,the yield efficiency was 39.7%. Ultrasonic for pretreatment of raw materials was conducive to improve the Perilla seed oil yield efficiency.