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Effects of Chungkukjang Added with Onion on Lipid and Antioxidant Metabolisms in Rats Fed High Fat-Cholesterol Diet

양파 첨가 청국장이 고콜레스테롤혈증 유발 흰쥐의 지질 및 항산화 대사에 미치는 영향

  • Park, Jae-Hee (Dept. of Food and Nutrition, Kyungnam University) ;
  • Kim, Jung-Mi (Dept. of Food and Nutrition, Kyungnam University) ;
  • Park, Eun-Ju (Dept. of Food and Nutrition, Kyungnam University) ;
  • Lee, Kyung-Hea (Dept. of Food and Nutrition, Changwon National University)
  • 박재희 (경남대학교 식품영양학과) ;
  • 김정미 (경남대학교 식품영양학과) ;
  • 박은주 (경남대학교 식품영양학과) ;
  • 이경혜 (창원대학교 식품영양학과)
  • Published : 2008.10.31

Abstract

This study was carried out investigate the effects of chungkukjang added with onion (OC) and chungkukjang (C) on the lipid and antioxidant metabolisms of hypercholesterolemic rats. Thirty-two male Sprague-Dawley rats were divided into four groups after 1-week adaptation period and were fed a normal diet, high fat-cholesterol diet (HC), HC-OC or HC-C for 8 weeks, respectively. The supplementation of HC-OC and HC-C groups significantly reduced hepatic total cholesterol and AST activity. HC-C group increased high density lipoprotein, while decreasing low density lipoprotein and AI compared with HC-OC group. Conjugated dienes of HC-C group was significantly lower than those of HC-OC group. $H_2O_2$ induced DNA damage reduced significantly in HC-OC and HC-C groups compared with high fat-cholesterol diet group. $H_2O_2$ induced DNA damage exhibited significant positive correlations with hepatic total cholesterol, AST and CD. These results suggested that supplementation of chungkukjang or chungkukjang added with onion might be helpful in preventing lipid oxidation and leukocytic DNA damage. However, the health beneficial effect has not improved by the addtion of onion in chungkukjang.

본 연구는 양파 첨가 청국장 첨가 식이가 고 콜레스테롤 흰 쥐의 지질대사 및 항산화대사에 미치는 영향을 알아보기 위해 Sprague-Dawley 수컷 32마리를 대조군(C), 고 콜레스테롤군(HC), 고콜레스테롤+양파 첨가 청국장군(HC-OC), 고콜레스테롤+청국장군(HC-C)로 나누어 실험 식이를 8주간 공급하였다. 8주 후 혈액과 간, 변을 수집하여 혈장, 간 및 변의 지질농도, 혈장 TRAP, CD, 적혈구내 항산화효소활성, comet assay를 통한 DNA 손상을 측정하였다. 모든 군에서 식이섭취량은 유의적 차이가 없었고, HC군에서 체중이 증가하였으며, 그 중 HC-C군에서 체중과 식이효율이 유의적으로 높았다. 간 무게는 C보다 고콜레스테롤 급여 군들에서 유의적으로 증가하였고, 분변량은 고콜레스테롤 식이군들에서 낮았으며, 변의 조지방은 고콜레스테롤 식이 군들에서 증가하였다. 양파 첨가 청국장과 청국장 급여로 HC군보다 간의 총 콜레스테롤 함량은 유의적으로 낮아졌으며, 혈장 지질 저하효과는 나타나지 않았다. 양파 첨가 청국장과 청국장 섭취로 부분적 간 기능 개선 효과를 나타내었으며, 청국장 급여로 혈장 CD농도는 유의적으로 낮아졌다. 그리고 HC-OC군과 HC-C군의 tail intensity는 감소하여 DNA 산화적 손상에 대한 보호 효과를 나타내었다. 따라서 양파첨가 청국장과 청국장은 부분적으로 지질 개선효과와 항산화력이 있음을 확인할 수 있었다. 그러나 양파와 청국장은 각각이 이미 우수한 항산화력을 가지고 있는 기능성식품으로서 이 두 소재의 혼합에 의한 상승효과는 크게 나타나지 않았던 것으로 생각된다.

Keywords

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