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This study was carried out to examine the authenticity discrimination of circulated vegetable oilsby using carbon isotope ratio (δ 13 C) and fatty acid composition. This analysis was applied to vegetable oilswhich we can buy in Korean markets, and the analytical instrument was measured by using EA-IR/MS forδ 13 C and GC/FID for fatty acid composition. δ 13 C was separated into 3 groups as C 3 plant including sesameoil, C 4 plant including maize oil, and rice bran oil. Fatty acid composition was significantly different amongvegetable oils. In addition, the interval of low and high price vegetable oils was classified through the scatterplot analysis showing the correlation of the δ 13 C and fatty acid composition. Therefore, through a simultaneousdetermination of the δ 13 C and fatty acid composition, we are able to determine the majority of vegetable oils.It help to ensure food safety in Korean market by exclusion of economically modified adulteration in food.:              ,             .          C

Discrimination of vegetable oils by stable carbon isotope ratio and fatty acid composition