文冠果籽油的超临界萃取及其脂肪酸组成(GC) . Supercritical extraction and fatty acid composition of seed oil in Xanthoceras sorbifolia

Abstract

In order to scientifi cally effectively develop and utilize Xanthoceras sorbifl ia, process conditions of seed oil extraction were researched by CO2 supercritical extraction techniques, and its physicochemical properties and fatty acid composition were analyzed. The results show that the optimum parameters of supercritical extraction of seed oil in X. sorbifl ia are extraction pressure 30 MPa, temperature 50℃, CO2 fl ow 40 L/h, and extraction time150 min, respectively. Under the conditions, extraction rate can reach 44.56%. The refractive index n20 is 1.4745, relative density d20 is 0.917 3, moisture and volatile matter content is 0.38%, acid value 0.51 mg/g, peroxide value 0.000 9 g/g, iodine value is 1.214 g/g, and saponifi cation value is 214 mg/g, respectively. The fatty acids of seed oil extracted by supercritical fl uid mainly consist of linoleic acid(40.9%), oleie acid(29.5%), erucic acid(8.89%), palmitic acid(4.95%), stearic acid(2.13%), linolenic acid(0.4%), arachidonic acid(0.02%) and behenic acid(0.53%). The total content of unsaturated fatty acids is 82.22%.