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

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Oxidative Stability of Lipids from Eel (Anguilla japonica) Fed Conjugated Linoleic Acid

Conjugated Linoleic Acid급여 뱀장어(Anguilla japonica) 지질의 산화안정성

  • Choi, Byeong-Dae (Division of Marine Bioscience/Institute of Marine Industry, Gyeongsang National University) ;
  • Kang, Seok-Joong (Division of Marine Bioscience/Institute of Marine Industry, Gyeongsang National University) ;
  • Ha, Young-Lae (Division of Applied Life Science/Institute of Agriculture and Life Science, Gyeongsang National University) ;
  • Kim, So-Young (School of Food Science, Jinju International University) ;
  • Lee, Jae-Jun (Dept. of Food & Nutrition, Chosun University)
  • 최병대 (경상대학교 해양생물이용학부/해양산업연구소) ;
  • 강석중 (경상대학교 해양생물이용학부/해양산업연구소) ;
  • 하영래 (경상대학교 환경생명식품공학부) ;
  • 김소영 (진주국제대학교 식품과학부) ;
  • 이재준 (조선대학교 식품영양학과)
  • Published : 2006.01.01
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Abstract

The oxidative stability of lipids from eel (Anguilla japonica) fed diets containing different concentrations of conjugated linoleic acid (CLA) was studied. Eels, 3 weeks of age, with an average weight of 160 g, were randomly divided into 5 groups (5 fishes/group) by body weight, and assigned to one of the five CLA-supplemented diets at the following concentrations: 0, 0.5, 1.0, 2.5, and $5.0\%$ CLA. After 8 weeks of feeding, eels were sacrificed and the total lipid contents were extracted. The lipids from each treatment groups were stored at $37^{\circ}C$ for 5 weeks. Changes in the fatty acid profile, lipid class, weight gained, peroxide value (POV) and carbonyl value (COV) of the lipid from each treatment groups were analyzed weekly. The composition of CLA in the lipids of eels fed with 0.5, 1.0, 2.5, and $5.0\%$ CLA-supplemented diets were 0.5, 1.7, 3.3, and $6.2\%$, respectively After 4 weeks of storage, the proportion of polyunsaturated fatty acids (PUFAs) in the lipid of eels fed diets containing 1.0 and $2.5\%$ CLA were 15.3 and $14.8\%$, respectively. Whereas, lipid extracted from eels fed with 0.5 and $5.0\%$ CLA-supplemented diets contain 11.8 and $7.4\%$ PUFAs, respectively. Lipid from the control sample contained $9.0\%$ PUFAs. POV and COV were found to be the lowest in the lipids samples from 1.0 and $2.5\%$ CLA diets. These results indicate that lipids from diets containing 1.0 or $2.5\%$ CLA were more stable against oxidative rancidity relative to other concentrations, suggesting that these are the appropriate CLA concentrations for the production of stable eel lipids.

최근 건강기능식품에 대한 관심이 높아지면서 기능성을 나타내는 원료에 대한 평가가 이루어지고 있다. 한국인의 식습관 상 어류 섭취가 많고 이로부터 DHA, EPA와 같은 기능성 지질의 섭취도 증가하고 있는 추세에 있다. 본 논문에서는 개별인정 형으로 추진되고 있으며 항암성, 체지방 감소효과 등을 보이고 있는 CLA를 어류사료에 첨가하여 안정성이 높은 중성지질의 형태로 바꾸어 항산화효과를 평가하고자 하였다. 뱀장어 사료에 CLA 함량을 $0\%,\;0.5\%,\;1.0\%,\;2.5\%$, 및 $5.0\%$로 성형하여 순환여과식 사육장치에서 8주간 사육하였다. 사육 후 이들 시료로부터 지질을 추출하고 $37^{\circ}C$에 저장하면서 지방산조성의 변화, 지질 class의 변화, 산소 소비에 따른 중량증가, 과산화물가, 카아보닐가 등으로 항산화능을 측정하였다. 측정결과 CLA 축적량은 $0.5\%,\;1.7\%,\;3.3\%$ 및 $6.2\%$로 나타나 CLA 공급이 많을수록 축적되는 CLA량은 증가하였다. 대조구의 경우 저장 3주 후부터 불포화산의 함량이 감소하여 $13.7\%$에서 5주 후에는 $6.2\%$로 급감하였다. $0.5\%$ CLA 급이구는 저장 4주째 불포화산의 함량이 $11.8\%$, 5주째는 $7.4\%$로 감소하였으며, $1.0\%$ 및 $2.5\%$ CLA 급이구에서는 불포화산의 함량이 4주째 $15.3\%$ 및 $14.8\%$로 변화가 적었다. 중성지질의 class 조성은 $1.0\%$ 및 $2.5\%$ CLA 급이구는 저장 5주째 중성지질과 인지질의 비가 53.9:46.1 및 64.3:35.7로 낮아졌으며, 다른 구에서는 저장 4주째부터 산화가 진행되었다. 과산화물가와 카아보닐가의 변화에서도 $1.0\%$ 및 $2.5\%$ CLA 급이구가 산화에 가장 안정한 것으로 나타났다.

Keywords

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