摘要
采用超临界CO2萃取技术对番茄籽油进行萃取,经过单因素和优化实验,对不同萃取时间、压力和温度下油的萃取率、脂肪酸组成和品质进行了比较.其中萃取时间和萃取压力对番茄籽油的萃取率影响显著(α=0.05),萃取温度影响较显著(α=0.1).最佳萃取条件为萃取时间2 h、萃取温度50℃、萃取压力30 MPa,萃取率达96.34％.通过气相色谱分析,由超临界CO2萃取得到番茄籽油的主要脂肪酸质量分数分别为:棕榈酸(C16:0)约13％,硬脂酸(C18:0)约5％,油酸(C18:1)约22％,亚油酸(C18:2)约56％,花生酸(C20:0)约2.8％.通过测定番茄籽油过氧化值、酸价、碘价和皂化价,显示番茄籽油有较好的品质,不同的萃取条件对番茄籽油品质无显著影响.
Supercritical CO2 extraction (SC-CO2) of oil from tomato seeds was carried out at various extraction temperatures, pressures, and time, through single-factor and optimal experiments. The extracted oil was analyzed for the extraction yield, the fatty acid composition and the quality. The results showed that the order of the effects of the factors on the extraction yield were: extraction time > pressure > temperature. The optimum extracting conditions obtained were 30MPa for 2 h at 50℃, which resulted in a yield of 96. 34%. Demonstrated by gas chromatography (GC), the fatty acid compositions and their contents in tomato seed oil after SC-CO2 extraction were: C16:0,13%; C18:0, 5.0%; C18:1, 22%; C18:2, 56%; and C20:0, 2.8%. Evaluated by POV, A. V. , S. V. and I. V. , the qualities of the tomato seed oil extracted by SC-CO2 were good as well. The extraction conditions have no significant effect on qualities of tomato seed oil.
基金
"十五"国家重大科技专项项目(2001BA501A232)资助课题
关键词
超临界CO2萃取
番茄籽油
萃取率
脂肪酸组成
supercritical fluid extraction
tomato seed oil
extraction yield
fatty acid composition
