A triple-isotope approach for discriminating the geographic origin of Asian sesame oils

•The isotope ratios (C, H, and O) of Korean sesame oil are negatively related to latitude.•The isotope ratios of the oil are negatively related to distance from the sea.•The isotope ratios of the oil are negatively related to precipitation.•The isotope ratios of the oil from Korea’s interior are neg...

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Bibliographic Details
Published in:Food chemistry 2015-01, Vol.167, p.363-369
Main Authors: Jeon, Hyeonjin, Lee, Sang-Cheol, Cho, Yoon-Jae, Oh, Jae-Ho, Kwon, Kisung, Kim, Byung Hee
Format: Article
Language:English
Subjects:
Asia
Biological and medical sciences
Canonical discriminant analysis
Carbon stable isotope
Food toxicology
Geographic origin
Hydrogen stable isotope
Isotopes - analysis
Medical sciences
Oxygen - analysis
Oxygen stable isotope
Plant Oils - analysis
Sesame oil
Sesame Oil - analysis
Toxicology
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Summary:•The isotope ratios (C, H, and O) of Korean sesame oil are negatively related to latitude.•The isotope ratios of the oil are negatively related to distance from the sea.•The isotope ratios of the oil are negatively related to precipitation.•The isotope ratios of the oil from Korea’s interior are negatively related to altitude.•A triple-isotope approach is a useful tool for the traceability of sesame oils. The aim of this study was to investigate the effects of the geographic location and climatic characteristics of the sesame-producing sites on the carbon, hydrogen, and oxygen stable isotope ratios of Korean sesame oil. In addition, the study aimed to differentiate Korean sesame oil from Chinese and Indian sesame oils using isotopic data in combination with canonical discriminant analysis. The isotopic data were obtained from 84 roasted oil samples that were prepared from 51 Korean, 19 Chinese, and 14 Indian sesame seeds harvested during 2010–2011 and distributed in Korea during the same period. The δ13C, δD, and δ18O values of Korean sesame oil were negatively correlated with latitude, distance from the sea, and precipitation (May–September), respectively. By applying two canonical discriminant functions, 89.3% of the sesame oil samples were correctly classified by their geographic origin, indicating that the triple-isotope approach is a useful tool for the traceability of the oils.
ISSN:0308-8146
1873-7072
DOI:10.1016/j.foodchem.2014.07.032