[Composition of fatty acid in commercially available bottled vegetable oil].
OBJECTIVE
To analyze the fatty acid composition of commercially available bottled vegetable oil, and to explore its characteristic composition and content and the proportion of specific fatty acids.


METHODS
A total of eight varieties of bottled vegetable oil which are popular in use or famous with local brand from eight districts of Beijing, Yunnan, Zhejiang, Hunan, Henan, Harbin, Jiangsu and Gansu were collected, and selected two different batches for each variety. After being saponified and methyl esterified, the fatty acids of vegetable oil samples were analyzed by Shimadzu GC2014 gas chromatography.


RESULTS
The commercially available bottled vegetable oils were mainly consisted of palmitic acid, oleic acid, linoleic acid and alpha-linolenic acid. The average content of trans fatty acids was 1.05g/100g. The ratio of saturated fatty acids: monounsaturated fatty acids: polyunsaturated fatty acid (S: M: P) of vegetable oil samples was in the range of 1:1. 6-9. 4: 0.9-7.4; the ratio of polyunsaturated fatty acid n-6 : n-3 was in the range of 0.37-289.5 : 1.


CONCLUSIONS
The content of trans fatty acid in commercially available bottled vegetable oil was low, however, most of the proportion of fatty acid did not meet the standards suggested by the Chinese Nutrition Society, and most of vegetable oils are lack of n-3 polyunsaturated fatty acids.
Institute of Nutrition and Food Safety, Chinese Center for Disease Control and Prevention, Beijing 100050, China. yingyang200909@yahoo.cn
Ying
Y
Lu
Yuexiao
Y
Chen
Mei
M
He
Yuexin
Y
Yang
D002681:China; D002849:Chromatography, Gas; D005227:Fatty Acids / Q000032:analysis*; D005229:Fatty Acids, Monounsaturated; D015525:Fatty Acids, Omega-3; D005231:Fatty Acids, Unsaturated; D019787:Linoleic Acid; D019301:Oleic Acid; D010938:Plant Oils / Q000737:chemistry*; D014675:Vegetables; D017962:alpha-Linolenic Acid
D005227:Fatty Acids; D005229:Fatty Acids, Monounsaturated; D015525:Fatty Acids, Omega-3; D005231:Fatty Acids, Unsaturated; D010938:Plant Oils; D017962:alpha-Linolenic Acid; D019301:Oleic Acid; D019787:Linoleic Acid