油茶籽油与不同植物油脂肪酸成分的分析比较

Comparison and analysis of fatty acids between oil-tea camellia seed oil and other vegetable oils

建立了采用气相色谱-质谱联用技术中选择离子检测(SIM)方式对常见植物油中的脂肪酸成分进行检测和分析比较的方法。结果表明:SIM方式检测到油茶籽油中19种脂肪酸成分,而全扫描(SCAN)方式仅检测到7种;油茶籽油与橄榄油的脂肪酸组成比较接近,其饱和脂肪酸、单不饱和脂肪酸和多不饱和脂肪酸相对含量比为20∶72∶7,油酸相对含量为69.97%;而玉米油、花生油、菜籽油、芝麻油、葵花籽油5种植物油多不饱和脂肪酸相对含量高达26.57%～58.38%,油酸相对含量仅为20.61%～50.04%。该方法简单、快速、检测灵敏度高,可用于植物油脂肪酸的成分分析。

The selected ion monitoring（SIM） method of gas chromatography/mass spectrometer（GC/MS） was adopted for detecting and analyzing fatty acid of common vegetable oils. The results showed that SIM method could detect nineteen＇ fatty acids compositions of oil - tea camellia seed oil, but SCAN method could only detect seven species ; the fatty acid composition of oil - tea camellia seed oil was similar to that of olive oil, and the relative content ratio of saturated fatty acids to monounsaturated fatty acids to polyun- saturated fatty acids was 20： 72： 7, in which the relative content of oleic acid was 69.97% in oil - tea ca- mellia seed oil. The polyunsaturated fatty acids of corn oil, peanut oil, rapeseed oil, sesame oil and sunflower oil were up to 26.57% -58.38%, in which the relative content of oleic acid was only 20.61% - 50.04%. The method was simple, quick and the detection sensitivity was very high ,and it could be applied to analyze fatty acid compositions of vegetable oils.