탄소 안정동위원소 비율 및 지방산 조성을 활용한 식용유지류의 판별
Discrimination of vegetable oils by stable carbon isotope ratio and fatty acid composition
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초록
본 연구는 국내외에서 생산되는 다양한 식용유지에 대한 탄소 안정동위원소 비율 및 지방산 조성을 분석하고, 국내 유통 식용유지의 순수 여부 등 과학적 관리 방안을 위한 기초자료를 마련하고자 수행되었다. 본 연구에 수집된 식용유지의 탄소 안정동위원소 비율은 참기름 등 C3 식물군, C4 식물군인옥수수유, 유의적인 차이가 인정되는 미강유 등 총 3개 그룹으로 구분이 가능하였다. 수거된 식용유지의지방산 조성은 각각의 지방산 마다 식용유지별로 유의성을 나타내었다. 또한, 탄소 안정동위원소 비율만으로 구분이 어려웠던 C3 식물 기원의 식용유지는 지방산을 동시 활용한 산점도 분포 분석을 통해 대표적인 저가 식용유지인 콩기름과 고가 식용유지인 참기름의 구분이 가능하였다. 따라서 탄소 안정동위원소 비율과 지방산 조성을 동시 활용하여 식용유지의 판별이 부분적으로 가능하였으며, 이는 추후 식용유지류 관리 방안으로 검토할 예정이다.
Abstract
This study was carried out to examine the authenticity discrimination of circulated vegetable oilsby using carbon isotope ratio (δ13C) 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 forδ13C and GC/FID for fatty acid composition. δ13C was separated into 3 groups as C3 plant including sesameoil, C4 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 δ13C and fatty acid composition. Therefore, through a simultaneousdetermination of the δ13C 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.
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