超临界二氧化碳萃取猕猴桃籽油分离工艺优化

以猕猴桃籽为原料，研究超临界CO2 萃取猕猴桃籽油的分离工艺。通过单因素试验和正交试验，研究不同分离工艺条件对萃取毛油的分离效果，并对二级降压分离工艺的分离Ⅰ、分离Ⅱ的压力和温度进行优化。研究结果表明：在萃取过程中采用二级降压分离，其中分离Ⅰ压力9MPa、温度42℃，分离Ⅱ压力6MPa、温度为室温(20～30℃)时，所制得猕猴桃籽油的水分及挥发物含量0.12%，酸价1.2mg KOH/g，可不需精炼即能达到质量标准。

Optimization of Supercritical CO2 Extraction of Kiwi Fruit Seed Oil

The supercritical CO2 extraction of kiwi fruit seed oil was carried out in two modes, namely constant pressure and two-stage pressure reducing separation, and the latter mode was selected for the studies carried out subsequently due to better physico-chemical properties and sensory attributes of kiwi fruit seed oil. Some conditions for the supercritical CO2 extraction of kiwi fruit seed oil in the latter mode were optimized using single factor and orthogonal array design methods. The results showed that the optimum values of pressure and temperature were found to be 9 MPa and 42 ℃ in separation pot Ⅰand 6 MPa and 20－30 ℃ in separation pot Ⅱ, respectively. The water content and acid value of the product extracted under these conditions were both very low and could meet the requirements of relevant industrial standards without refining.