食品科学 ›› 2010, Vol. 31 ›› Issue (7): 146-149.doi: 10.7506/spkx1002-6300-201007032

• 基础研究 • 上一篇    下一篇

不同方法萃取的燕麦油脂肪酸组成及清除DPPH 自由基活性研究

李 林,张大顺*   

  1. 湖南文理学院生命科学学院
  • 收稿日期:2009-07-24 修回日期:2009-11-21 出版日期:2010-04-01 发布日期:2010-12-29
  • 通讯作者: 张大顺 E-mail:zhangds0736@126.com

Comparative Study on Fatty Acid Composition and DPPH Free Radical Scavenging Activity of Oat Oils Extracted by Different Methods

LI Lin,ZHANG Da-shun *   

  1. College of Life Science, Hunan University of Arts and Science, Changde 415000, China
  • Received:2009-07-24 Revised:2009-11-21 Online:2010-04-01 Published:2010-12-29
  • Contact: ZHANG Da-shun E-mail:zhangds0736@126.com

摘要:

对以正已烷、甲醇为溶剂和不添加与添加乙醇为夹带剂的超临界CO2(SCF-CO2)萃取的燕麦油的脂肪酸组成与清除DPPH 自由基活性进行研究,气相色谱分析结果显示,对于SCF-CO2、添加夹带剂的SCF-CO2、正己烷、甲醇4 种方法萃取的燕麦油中:脂肪酸主要由棕榈酸、反式油酸、亚油酸构成,三者相对含量的总和在燕麦油的脂肪酸总量中都占93%;不饱和脂肪酸相对含量依次为79.41%、77.86%、77.56% 与76.51%,饱和脂肪酸、单不饱和脂肪酸与多不饱和脂肪酸的比例依次为1:2.74:1.85、1:2.08:1.71、1:2.21:1.60 与1:1.74:1.73。DPPH自由基清除实验结果显示:SCF-CO2 萃取的燕麦油能有效清除DPPH 自由基,清除能力由强到弱依次为:VC >甲醇提取燕麦油>添加夹带剂的SCF-CO2 提取燕麦油> VE >正己烷提取燕麦油>无夹带剂的SCF-CO2 提取燕麦油。

关键词: 燕麦油, 超临界CO2 萃取, 气相色谱分析, 清除DPPH 自由基

Abstract:

Oat oils extracted by supercritical carbon dioxide fluid (SCF-CO2) with and without ethanol added as entrainer and those extracted with n-hexane or methanol were compared for differences in fatty acid composition and DPPH free radical scavenging activity. GC analysis showed that the fatty acid composition of 4 oat oils mainly consisted of palmitc acid, elaidic acid and linoleic acid and they together accounted for 93% of total fatty acid in each oat oil. Oat oils extracted by SCF-CO2 with and without ethanol added as entrainer and those extracted with n-hexane or methanol exhibited relative contents of unsaturated fatty acids of 79.41%, 77.86%, 77.56% and 76.51% and ratios of saturated fatty acids to monounsaturated fatty acids to polyunsaturated fatty acids of 1:2.74:1.85, 1:2.08:1.71, 1:2.21:1.60 and 1:1.74:1.73, respectively. The DPPH free radical scavenging activity of the oat oils and vitamins C and E decreased in the following order: vitamin C>oat oil extracted with methanol >oat oil extracted by SCF-CO2 with ethanol added as entrainer>vitamin E >oat oil extracted with n-hexane>oat oil extracted by SCF-CO2 without ethanol added as entrainer.

Key words: oat oil, supercritical carbon dioxide fluid extraction, GC, DPPH free radical scavenging activity

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