不同提取方法对新疆薄皮核桃油酸价和过氧化值的影响

Effect of different extraction conditions on the acid value and peroxide value of Xinjiang walnut oil

探讨不同提取方法对新疆薄皮核桃油酸价和过氧化值的影响。分别采用索氏抽提有机溶剂(石油醚)法、超临界CO_2萃取法、冷榨法提取薄皮核桃油,用容量分析法测定油脂中的酸价和过氧化值,并比较三种方法提取的油脂的氧化稳定性。结果表明,提取方法对核桃油脂的色泽、气味、氧化稳定性影响较大。索氏抽提法操作简便、成本低,但得到的核桃油脂有溶剂残留,需脱溶,且提取时间较长。超临界CO_2萃取精密度可靠,得到的油脂品质和纯度高,但生产成本高。结合实际生产,冷榨法更适合用于核桃油的提取。

The effect of different extraction methods for Xinjiang walnut oil on acid value and peroxide value was discussed. The walnut oil was extracted by the methods of Soxhlet extraction organic solvents( petroleum ether),supercritical CO_2 extraction and cold pressing. The acid value and peroxide value was determined by volumetric analysis. The oxidative stability of the oil samples extracted by the above three methods was compared. The results showed that the extraction method affected the color,smell and oxidative stability. Soxhlet is simple and low cost,but need desolvation and long time. The precision of supercritical CO_2 extraction is reliable,and the oil quality and purity is higher,but the production cost is high. Combined with the practical production,the cold pressing method is more suitable for the extraction of walnut oil.