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

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Antioxidative Effects of Chungkukjang Fermented Using Bacillus subtilis DJI in Rats Fed a High Cholesterol Diet

고콜레스테롤식이를 급여한 흰쥐에서 Bacillus subtilis DJI 이용하여 제조한 청국장의 항산화효과

  • Published : 2009.12.31
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Abstract

This study was conducted to investigate the antioxidative effects of chungkukjang fermented using Bacillus subtilis DJI (DJI CJ) in rats fed high cholesterol diet. Sprague-Dawley male rats weighing 185-195 g were divided into 6 groups: normal group (N), high cholesterol group (C), high cholesterol and DJI CJ with no salt group (C-CJN), high cholesterol and DJI CJ added with solar salt group (C-CJS), high cholesterol and DJI CJ added with refined salt group (C-CJR), and high cholesterol and commercial CJ group (C-CCJ). The body weight gain and food intake in all four CJ groups were lower than C group. The serum activities of AST and ALT that were elevated by high cholesterol diet were significantly decreased by CJ supplemented. The hepatic activities of catalase and SOD in C group were increased to 20.59% and 18.72%, respectively, compared with N group, but those of C-CJN, C-CJS, C-CJR, and C-CCJ groups were similar to those of N group. Liver TBARS contents were significantly decreased in all CJ groups, compared with C group. The contents of brain lipofuscin in C-CJN, C-CJS, C-CJR, and C-CCJ groups were remarkably inhibited about 20.86%, 22.06%, 14.73%, and 12.88%, respectively, compared with C group. There were no significant differences among DJI CJ groups in antioxidative effects. According to this study, DJI chungkukjang or commercial chungkukjang seems to protect tissues from oxidative stress by stimulating antioxidative systems in rats fed a high cholesterol diet.

본 연구는 고콜레스테롤식이를 급여한 흰쥐에게 B. subtilis DJI로 발효한 청국장에 소금의 종류를 달리하여 제조한 DJI 청국장 분말을 함께 급여하였을 경우 항산화효과에 미치는 영향을 알아보고자 정상군(N), 대조군(C), 고콜레스테롤과 무염 DJI 청국장식이군(C-CJN), 고콜레스테롤과 천일염 첨가 DJI 청국장식이군(C-CJS), 고콜레스테롤과 정제염첨가 DJI 청국장식이군(C-CJR) 및 고콜레스테롤과 시판청국장식이군(C-CCJ)으로 6군으로 나누어 4주간 실시하였다. 체중증가량과 식이섭취량은 청국장을 급여한 군들이 정상군과 대조군에 비하여 저하되었다. 식이효율은 실험군 간의 차이가 없었다. 혈청 중 AST와 ALT 활성은 고콜레스테롤과 청국장을 함께 급여한 군들이 대조군에 비하여 저하된 경향이었으며, 정상군과는 유사한 경향을 나타내었다. 고콜레스테롤 급여로 인하여 정상군에 비하여 대조군의 간 조직 중 SOD와 catalase 활성은 증가되었고, 증가되어진 SOD와 catalase 활성은 고콜레스테롤과 청국장을 함께 급여하였을 경우에는 감소되었다. 간 조직 중 GSH-Px와 XO 활성 및 GSH 함량은 각 실험군 간에 유의차를 보이지 않았다. 간 조직 중 과산화지질 함량은 대조군이 가장 높았으나, 고콜레스테롤과 DJI 청국장 혹은 시판청국장을 함께 급여하였을 경우에는 생성이 억제되었다. 간 조직 중 리포푸신 함량은 실험군 간의 유의차가 없었으나, 뇌 조직 중 리포푸신 생성량은 청국장 분말 급여로 저하되었으며 DJI 청국장 중 무염청국장군과 천일염 첨가 청국장군이 리포푸신 생성량을 가장 많이 억제하였다. DJI 청국장의 항산화효과와 노화억제효과는 시판청국장과 비슷한 경향을 나타내었다. DJI 청국장군 간에는 항산화효과 차이가 없었다. 이는 청국장 발효 후 첨가한 소금이 청국장이 가지고 있는 항산화력에는 영향을 미치지 않는 것으로 나타났다. 이상의 결과 DJI 청국장과 시판청국장 분말은 고콜레스테롤식이로 유도된 산화적 손상에 대한 보호효과와 노화 억제효과가 있는 것으로 생각되어진다.

Keywords

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