Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Changes of Fatty Acid Composition and Oxidation Stability of Edible Oils with Frying Number of French Fried Potatoes

감자튀김 횟수에 따른 식용유지의 산화 안정성 및 지방산 조성 변화

  • Lee, Jin-Won (Dept. of Food & Biotechnology, Hankyong National University) ;
  • Park, Jang-Woo (Dept. of Food & Biotechnology, and Food and Bio-Industrial Research Center, Hankyong National University)
  • 이진원 (한경대학교 식품생물공학과) ;
  • 박장우 (한경대학교 식품생물공학과 및 식품생물산업연구소)
  • Received : 2010.03.19
  • Accepted : 2010.06.24
  • Published : 2010.07.31
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Abstract

Sunflower oil (SO), canola oil (CO) and frying oil (FO) were used as edible oils in this study. According to the frying number, the extracted oils from French fried potatoes were used as experimental samples. To investigate the relationship between the change of fatty acid composition and the stability of the lipid oxidation during frying, the changes of fatty acid composition and the degree of the lipid oxidation of samples were examined. Acid values and peroxide values were evaluated as the degree of lipid oxidation. The acid values of CO and FO were increased with the frying times. The increased acid values of CO and FO were 0.20 and 0.17 on the basis of initial value at 30 times, respectively, but the acid value of SO was lower than those of CO and FO. The peroxide values of the samples were not increased uniformly with the frying number. As the number of frying times was increased, the fatty acid composition of SO and FO were changed. Namely, the oleic acid composition was decreased, whereas the linoleic acid composition was increased with the number of frying times. The benzo(a)pyrene contents of the extracted oils from French fried potatoes did not change regularly as the frying times was increased.

본 연구에서는 감자튀김 횟수에 따른 각종 식용유지의 화학적 특성 변화를 측정하였다. 식용유지로서는 sunflower oil(SO), canola oil(CO) 및 frying oil(FO)을 사용하였으며, 튀긴 감자에서 추출한 기름의 지방산 조성 변화와 산화 안정성에 대하여 실험하였다. 튀긴 감자에서 추출한 기름의 산화정도는 산가와 과산화물가를 측정하였다. CO 및 FO를 사용하여 튀긴 감자에서 추출한 기름에 대한 산가는 튀김 횟수가 30회의 경우 초기보다 각각 0.20, 0.17 증가한 결과를 나타내었다. SO의 산가는 CO와 FO에 비하여 그 값이 낮게 나타났다. 과산화물가 측정 결과는 일률적으로 증가하지는 않았다. 지방산 조성 변화에 대하여 측정한 결과 SO 및 FO를 사용하여 감자를 튀긴 경우 튀김 반복횟수가 증가할수록 oleic acid 함량은 감소하고 linoleic acid 함량은 증가하였다. 벤조피렌 생성 유무 측정 결과는 SO, CO 및 FO에서 튀김 초기와 반복횟수에 따라서 큰 변화는 나타나지 않았다. 이러한 결과 튀김에 사용한 식용유지 종류 및 튀김 반복 횟수에 따라서 지방산 조성에 변화가 나타나며 그로 인하여 유지의 산화 안정성에 영향을 미침을 알 수 있었다.

Keywords

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