超临界CO2萃取富硒百香果籽油的工艺研究
Optimization of extraction of Selenium enriched passion fruit seed oil with supercritical CO2 extraction technology
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摘要: 采用超临界CO2法萃取富硒百香果籽油,在单因素试验基础上,采用RSM-CCD (响应面曲线-中心复合设计法)研究萃取温度、萃取压力、静态萃取时间和动态萃取时间对富硒百香果籽油萃取率的影响,并对超临界CO2法和索氏抽提法萃取的富硒百香果籽油理化性质、脂肪酸含量和抗氧化活性进行对比分析。结果表明:采用超临界CO2法萃取富硒百香果籽油的最佳工艺条件为萃取温度50℃、萃取压力34 MPa、静态萃取时间109 min、动态萃取时间97 min、CO2流速1.0 L/min,在此工艺条件下所得百香果籽油为透明淡黄色液体,萃取率可达72.33%;超临界CO2法萃取的富硒百香果籽油中不饱和脂肪酸含量达80.11%,略高于索氏抽提法萃取的富硒百香果籽油中脂肪酸含量(78.71%),油脂酸价、过氧化值、抗氧化活性等均优于索氏抽提法萃取的油脂,油脂品质更好。Abstract: Selenium enriched passion fruit seed oil was prepared by supercritical CO2 extraction method with Selenium enriched passion fruit seed as raw material. Based on single factor experiment, RSM-CCD (response surface curve-central composite design) was used to explore the effects of temperature, pressure, static extraction time, dynamic extraction time and CO2 flow rate on the extraction rate of Selenium enriched passion fruit seed oil. And the physical and chemical properties, fatty acid content and antioxidant activity of selenium-rich passionfruit seed oil extracted by supercritical CO2extraction and Soxhlet extraction were investigated. The results showed that optimal process parameters of supercritical CO2 extraction for oil from Selenium enriched passion seed was found to be extraction temperature of 50 ℃,extraction pressure of 34 MPa,static extraction of 109 min,dynamic extraction of 97 min, CO2 flow rate of 1.0 L/min. Under this condition, the actual Selenium enriched passion seed oil was clear light yellow liquid, and the yield was 72.33%. The content of unsaturated fatty acids extracted by supercritical CO2 extraction was 80.11%, which was slightly higher than that extracted by soxhlet extraction (78.71%); Acid value, peroxide value, oxidation resistance and other properties also showed that the quality of oil extracted by supercritical CO2 extraction was better than that extracted by Soxhlet extraction.
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