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

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Antimicrobial Effect of Caesalpinia sappan L. Extract on Foodborne Bacteria

식중독 세균에 대한 소목 추출물의 항균 활성

  • Kim, Yi-Seul (Department of Food Science and Biotechnology, Chungbuk National University) ;
  • Shim, Hye-Mee (Department of Food Science and Biotechnology, Chungbuk National University) ;
  • Kim, Kwang-Yup (Department of Food Science and Biotechnology, Chungbuk National University)
  • 김이슬 (충북대학교 식품생명공학과) ;
  • 심혜미 (충북대학교 식품생명공학과) ;
  • 김광엽 (충북대학교 식품생명공학과)
  • Received : 2016.02.05
  • Accepted : 2016.05.27
  • Published : 2016.07.31
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Abstract

To develop a natural antimicrobial agent, we investigated the antimicrobial activities of 13 species of edible herbal plant extracts against major Gram-positive foodborne bacteria. Among the 13 screened edible herbal plants, Caesalpinia sappan L. showed the highest antimicrobial activity. In the paper disc agar diffusion assay, Caesalpinia sappan L. extracts had strong antibacterial activities against most Gram-positive bacteria but did not have antibacterial activities against most Gram-negative bacteria. Minimum inhibitory concentrations of the ethanol extract were 0.06 mg/mL against Clostridium difficile and Listeria monocytogenes and 0.03 mg/mL against Staphylococcus aureus. Their inhibitory activities were not reduced by heat treatment or pH adjustment against C. difficile, L. monocytogenes, and S. aureus. Antimicrobial activities were higher in ethanol extract than in distilled water extract. These results support the potential use of Caesalpinia sappan L. ethanol extract as an antimicrobial agent or functional food components against Gram-positive bacteria.

본 실험은 식용 가능한 약용식물을 대상으로 하여 항균 활성을 검색하였다. 미생물에 대하여 약용 식물을 50 mg/mL, 100 mg/mL, 200 mg/mL의 농도로 하여 paper disc agar diffusion assay로 항균 활성을 검색한 결과 소목 추출물에서 가장 높은 항균 활성을 나타내었다. 이에 따라 소목의 에탄올 추출물과 열수 추출물을 각각 200 mg/mL, 100 mg/mL, 50 mg/mL의 농도로 하여 paper disc agar diffusion assay로 항균 활성을 검색한 결과 소목 추출물은 그람 양성균에서 높은 항균 활성을 나타내었고, 소목의 에탄올 추출물이 소목의 열수 추출물보다 높은 항균 활성을 나타내었다. 소목 에탄올 추출물과 열수 추출물의 각 분획물을 50 mg/mL의 농도로 하여 paper disc agar diffusion assay로 항균 활성을 검색한 결과 그람 양성균은 클로로포름, 에틸아세테이트, 부탄올 층에서 항균 활성을 나타내었고, 그람 음성균은 항균 활성을 나타내지 않았다. 소목의 항균 물질로 추정되는 brazilin은 주로 에틸아세테이트 분획층에 존재하므로 소목 에탄올 추출물에서 클로로포름, 에틸아세테이트, 부탄올의 항균 활성이 유사한 점으로 미루어 brazilin 외에도 다양한 항균 물질이 존재하여 이들이 복합적으로 작용하여 항균 활성을 나타내는 것으로 생각한다. 현재까지 가장 강력한 항생제로 알려진 vancomycin과의 항균 활성을 비교한 결과 50 mg/mL 농도에서 소목 75% 에탄올 추출물의 항균 활성은 vancomycin 2.5 mg/mL를 사용하였을 때와 유사한 항균 활성을 나타내었다. 소목의 추출물을 가지고 미생물에 대한 최소저해농도를 측정한 결과 C. difficile KCTC 5009, L. monocytogens ATCC 19115의 최소저해농도는 0.06 mg/mL였고, S. aureus KCTC 1916에 대한 최소저해농도는 0.03 mg/mL였다. Vancomycin의 유효혈청농도는 0.005~0.04 mg/mL로 견줄만한 항균 활성을 나타내었다. 소목추출물을 가지고 열 및 pH 안정성을 측정한 결과는 항균력은 C. difficile KCTC 5009, L. monocytogens ATCC 19115, S. aureus KCTC 1916에서 모두 대조구와 비슷하게 억제환이 생성되어 소목 추출물의 항균성 물질은 열 및 pH에 대체로 안정한 결과를 보여주었다. 상기 결과들을 종합해 볼 때 소목 에탄올 추출물이 그람 양성균에 대해 항균활성이 뛰어난 것으로 보아 소목을 그람 양성의 병원성 미생물을 억제하기 위한 항균제제 및 기능성 식품의 소재로써 활용할 수 있다고 판단된다.

Keywords

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