Antioxidative Effects of Doenjang Fermented Using Bacillus subtilis DJI

Bacillus subtilis DJI을 이용하여 제조한 된장의 항산화효과

  • Lee, Jae-Joon (Department of Food and Nutrition, Chosun University) ;
  • Lee, Yu-Mi (Department of Food and Nutrition, Chosun University) ;
  • Chang, Hae-Choon (Department of Food and Nutrition, Chosun University) ;
  • Lee, Myung-Yul (Department of Food and Nutrition, Chosun University)
  • 이재준 (조선대학교 식품영양학과) ;
  • 이유미 (조선대학교 식품영양학과) ;
  • 장해춘 (조선대학교 식품영양학과) ;
  • 이명렬 (조선대학교 식품영양학과)
  • Published : 2009.08.30

Abstract

We investigated the antioxidative effects of solvent extracts of doenjang fermented using Bacillus subtilis DJI (DJI doenjang) in vitro. The solvents used for extraction were ethanol, n-hexane, and water. The antioxidative activities of DJI doenjang solvent extracts were measured by estimation of peroxide value, the presence of linoleic acid level, and nitrite scavenging activity, the Rancimat test, and 1,1-diphenyl-2-picryl hydrazyl (DPPH) free-radical generation, in comparison with the commercial antioxidant butylated hydroxytoluene (BHT). The peroxide value of an ethanol extract was lower than those obtained using n-hexane and water extracts. Furthermore, the peroxide value of the ethanol extract was similar to that obtained after BHT treatment. The nitrite scavenging activity was 23.36% after addition of 600 ppm DJI doenjang ethanol extract, and the DPPH free-radical scavenging activity was 19.06% under same condition, which shows that DJI doenjang ethanol extract exhibited lower antioxidative capacities than did BHT. In the Rancimat test, the ethanol extract (11.20 min induction time), n-hexane extract (7.58 min induction time), and water extract (8.26 min induction time) after treatment with 600 ppm DJI doenjang extracts demonstrated longer induction periods than did BHT (6.94 min). These results indicate that DJI doenjang has potential anti-oxidative activity.

B. subtilis DJI 균주로 접종 후 천일염을 첨가하여 제조한 B. subtilis DJI 된장의 에탄올, 물 및 헥산의 용매별 항산화효과를 비교하였다. B. subtilis DJI 된장의 에탄올 추출물 수율은 15.9%, 헥산 추출물 수율은 14.9% 및 물 추출물 수율은 26.9% 범위로 물 추출물 수율이 가장 높았다. 과산화물가는 B. subtilis DJI 된장 용매별 추출물 중에서 에탄올 추출물이 300 ppm에서 600 ppm으로 농도를 증가하였을 경우 저하되어 과산화물 생성 억제효과가 있었으며, 합성항산화제인 BHT와 유사한 경향을 보였다. 아질산염 소거능은 B. subtilis DJI 된장 에탄올 추출물이 300 ppm과 600 ppm 농도에서 각각 18.26%와 23.36%로 가장 높았고, 물 추출물에서 10.23%와 12.46%였고, 헥산 추출물에서는 2.62%와 5.51%로 가장 낮아 헥산 추출물의 경우 항산화효과가 아주 미비한 것으로 나타났다. 전자공여능도 아질산염 소거능과 비슷한 경향을 보여 시료 농도가 증가할수록 항산화효과가 증가하였고, 에탄올 추출물이 가장 우수한 항산화효과를 나타내었다. 그러나 B. subtilis DJI 된장 추출물의 아질산염 소거능과 전자공여능은 합성항산화제인 BHT에 비해서는 낮은 경향이었다. Rancimat 방법으로 측정한 항산화효과도 두 농도 모두 B. subtilis DJI 된장 에탄올 추출물의 항산화효과가 가장 우수하였으나, 물과 헥산 추출물은 항산화효과에 영향을 미치지 않았다.

Keywords

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