湖北农业科学 ›› 2018, Vol. 57 ›› Issue (11): 87-90.doi: 10.14088/j.cnki.issn0439-8114.2018.11.021

• 检测分析 • 上一篇    下一篇

反相液相色谱法对米糠油中四种生育酚含量的测定

李晴, 周晓晴, 陈沙, 喻俊磊   

  1. 江西省食品检验检测研究院,南昌 330001
  • 收稿日期:2018-03-06 出版日期:2018-06-10 发布日期:2019-12-19
  • 通讯作者: 喻俊磊,工程师,硕士,主要从事食品质量安全与检测工作,(电子信箱)410231868@qq.com。
  • 作者简介:李 晴(1991-),女,江西高安人,助理工程师,主要从事食品安全与检测工作,(电话)18070153368(电子信箱)1048882363@qq.com
  • 基金资助:
    江西省食品药品监督管理局科技计划项目(2016sp11)

The Content of Four Kinds of Tocopherol in Rice Bran Oil was Determined by Reversed-phase Liquid Chromatography

LI Qing, ZHOU Xiao-qing, CHEN Sha, YU Jun-lei   

  1. Food Inspection and Testing Institute of Jiangxi Province,Nanchang 330001,China
  • Received:2018-03-06 Online:2018-06-10 Published:2019-12-19

摘要: 建立了反相液相色谱法同时测定植物油中4种生育酚的方法。样品用甲醇超声提取,离心后取上清液氮吹至干,甲醇定容后过有机相滤膜,PEF柱(150 mm×3.0 mm,2.6 μm)分离,甲醇∶水(88∶12)作流动相等度洗脱,流速0.4 mL/min;柱温30 ℃;荧光检测(λex=294 nm,λem=328 nm)进样5 μL,外标法定量,在20 min内同时分离出α-、β-、γ-和δ- 4种生育酚异构体。4种生育酚的质量浓度在0.5~50.0 μg/mL与峰面积呈良好的线性关系,线性相关系数大于0.999。在3个添加水平下的平均加标回收率在84.47%~116.50%,相对标准偏差≤6.0%(n=6),α-生育酚、β-生育酚、γ-生育酚及δ-生育酚的方法检出限分别为0.10、0.05、0.05、0.04 mg/kg,表明该方法灵敏度高,回收率好,可应用于实际样品的分析。

关键词: 反相高效液相色谱, 荧光检测, 生育酚, 米糠油

Abstract: The method of simultaneous determination of 4 kinds of tocopherol in vegetable oil was established by reversed-phase liquid chromatography.After sample ultrasonic extraction with methanol,centrifugal supernatant liquid nitrogen blow to dry,the capacity after the methanol organic phase filter membrane,PEF column(150×3.0 mm,2.6microns) separation,methanol and water (88∶12) elution flow equal degree,velocity 0.4 mL/min;Column temperature 30 ℃;The fluorescence detection (a) of the sample volume was 5 μL,the external standard method was quantitatively determined,and the two types of paroxygenol isomers were isolated at the same time in 20 min. The mass concentration of 4 kinds of tocopherol was in a good linear relationship with the peak area within the range of 0.5~50.0 μg/mL,and the linear correlation coefficient was greater than 0.999. Adding in the three levels with respect to the average recovery was 84.47%~116.50%,relative standard deviation(RSD) for 6.0% or less(n=6),alpha tocopherol,beta tocopherol,gamma tocopherol and delta-tocopherol,method detection limit (LOD) were respectively 0.10,0.05,0.05,0.04 mg/kg. The method is accurate,sensitive and reliable,and can be applied to the analysis of actual samples.

Key words: inverse phase high performance liquid chromatography, fluorescence detection, tocopherol, rice bran oil

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