11种品牌玉米油脂肪酸及异构体的主成分分析  

Principal Component Analysis of Fatty Acids and Their Isomers in Eleven Brands of Corn Oil

作　　者：贺凡[1] 郭芹[1] 顾丰颖[1] 哈益明[1] 宁吉英 高萍萍[1] 王锋[1] HE Fan GUO Qin GU Feng-ying HA Yi-ming NING Ji-ying GAO Ping-ping WANG Feng(Institute of Food Science and Technology, Chinese Academy of AgriculaLral Sciences/Comprehensive Key Laboratory of Agro-Products Processing, Ministry of Agriculture, Beijing 100193, China)

机构地区：[1]中国农业科学院农产品加工研究所/农业部农产品加工综合性重点实验室,北京100193

出　　处：《现代食品科技》2017年第2期190-196,共7页Modern Food Science and Technology

基　　金：国家自然科学基金项目(31271851);北京市自然科学基金项目(6154033);中国博士后基金项目(2014M561105;2015T80158)

摘　　要：对市售的11种品牌玉米油开展了脂肪酸(包括脂肪酸及其异构体)组成与含量的调查研究。采用气相色谱技术,结合主成分分析法,分析了不同品牌玉米油中脂肪酸的差异性和相关性。结果表明,11种品牌玉米油中共鉴定出19种脂肪酸,包括7种饱和脂肪酸,5种不饱和脂肪酸,6种反式脂肪酸(TFAs)和1种共轭亚油酸(t,t-CLAs),平均含量分别为14.18×10^(-2) g/g,80.32×10^(-2) g/g,1.47×10^(-2) g/g和0.23×10^(-2) g/g;其中,亚油酸(C18:2-9c12c)、油酸(C18:1-9c)和棕榈酸(C16:0)依次是玉米油中含量最多的3种脂肪酸;不同品牌玉米油中脂肪酸含量存在显著性差异(p<0.05)。主成分分析揭示了不同品牌玉米油在脂肪酸含量上的相似性、差异性及脂肪酸之间相关程度,TFAs和CLAs正相关程度高。本研究为评价市售玉米油脂肪酸品质特征提供了较为全面的数据支撑。The composition and content of fatty acids and their isomers in 11 brands of commercial corn oil were investigated.The corn oils were analyzed by gas chromatography（GC） and the differences and correlations among fatty acids were assessed with principal component analysis（PCA）.Nineteen types of fatty acids were identified in the 11 corn oil samples,including seven saturated fatty acids,five unsaturated fatty acids,six trans fatty acids（TFAs）,and one conjugated linoleic acids（t,t-CLAs）,with average content of（14.18,80.32,1.47,and 0.23）×10-（-2）g/g,respectively.Among them,the amount of linoleic acid（C18：2-9c12c） was the highest in corn oils,followed by oleic acid（C18：1-9c） and palmitic acid（C16：0）.The fatty acid content varied significantly for different corn oil brands（P〈0.05）.PCA revealed similarities and differences of fatty acid content among the different brands of corn oil.The analysis also revealed correlations among fatty acids,in which a positive correlation between trans and conjugated fatty acids was identified.The study provides evidence to support the evaluation fatty acid quality in commercial corn oil.

关 键 词：玉米油 脂肪酸 异构体 气相色谱 主成分分析 

分 类 号：TS227[轻工技术与工程—粮食、油脂及植物蛋白工程]