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Electronic-nose system was used to discriminate commercial sesame oils (A-F) extracted from imported seeds. Response (delta Rgas/Rair) of sensors gained from electronic nose was analyzed by principal component analysis (PCA). Flavor pattern of sesame oil A was similar to those of sesame oils B, C, and D. Sesame oils blended with corn oil at the ratio of 95:5, 90:10 and 80:20% (sesame oil/corn oil, w/w) could be discriminated from each genuine sesame oil.