Korean Journal of Food Science and Technology (한국식품과학회지)

Korean Society of Food Science and Technology (한국식품과학회)
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Antibacterial activity of ethanol extracts from marine micro-algae

해양미세조류 에탄올 추출물의 항균활성에 관한 연구

  • Kim, Yun-Jung (Food Research center, Hanwha Hotel and Resort) ;
  • Ha, Sang-Chul (Department of Hotel Culinary Arts, Daegu Future College) ;
  • Kim, Dae Uk (Research Planning and Management Division, Food and Drug Safety Evaluation, Ministry of Food and Drug Safety) ;
  • Shin, Il-Shik (Department of Marine Food Science and Technology, Gangneung-Wonju National University)
  • 김윤정 (한화호텔앤드리조트 식품연구센터) ;
  • 하상철 (대구미래대학교 호텔외식조리과) ;
  • 김대욱 (식품의약품안전처 연구기획조정과) ;
  • 신일식 (강릉원주대학교 해양식품공학과)
  • Received : 2017.04.17
  • Accepted : 2017.05.22
  • Published : 2017.08.31
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Abstract

The antibacterial activity of ethanol (99.9%) extracts from marine micro-algae, namely, Mixed A (Pavlova sp., Thalassiosira weissflogii, Tetraselmis suecica and Isochrysis galbana were mixed with 1:1:1:1 ratio), Chlorella vulgaris, Nannochloropsis oculata and Chaetoceros calcitrans were estimated against food-borne bacteria, namely, Escherichia coli, Salmonella Typhimurium, Staphylococcus aureus and Bacillus cereus. The extracts from these marine micro-algae showed potent antibacterial activity against all tested bacteria by the paper disk method. The extracts from C. vulgaris showed the strongest antibacterial activity against E. coli with minimum inhibitory concentration (MIC) of 0.62 mg/mL, and minimum bactericidal concentration (MBC) of 2.50 mg/mL. The extract from C. vulgaris contained 2 active compounds, 38.8% linoelaidic acid and 30.0% phytol. These results indicated that the ethanol extract from C. vulgaris may be a putative natural antibacterial agent against food-borne bacteria.

Mixed A, Chlorella vulgaris, Nannochloropsis oculata, Chaetoceros calcitrans 등 4종류의 미세조류로부터 99.9% 에탄올로 추출한 성분의 항균활성을 검증하기 위해 그람음성세균 2종(E. coli, S. Typhimurium)과 그람양성세균 2종(S. aureus, B. cereus)에 대하여 paper disk diffusion assay, MIC, MBC를 측정하였다. 4종류의 미세조류 추출물은 공시균주에 대하여 0.62-1.66 mg/mL의 MIC를 나타내었으며, C. vulgaris 추출물이 4종의 공시균주에 대한 MIC가 0.62 mg/mL로 가장 강한 항균활성을 나타내었으며, MBC 또한 C. vulgaris 에탄올 추출물이 E. coli에 대해 2.50 mg/mL, S. aureus, B. cereus와 S. Typhimurium에 대해서는 4.16-5.00 mg/mL로 가장 강한 항균활성을 나타내었다. 항균활성이 가장 강한 C. vulgaris 에탄올 추출물의 성분을 분석한 결과, 함량이 가장 많은 성분은 9,12-octadecadienoic acid (linoelaidic acid, peak 5, 7)로 38.8%이었으며, 그 다음이 2-Hexadecen-1-o1, 3,7,11,15-tetramethyl (phytol, peak 2,6)로 30.0%이었다. Octadecadienoic acid는 일명 linoelaidic acid로 탄소수 18개의 고도불포화지방산이며, 두 번째로 함량이 많은 Phytol은 클로로필을 구성하는 불포화 제1급 알코올의 일종으로서(엽록소의 구성 성분) 병원성 대장균 및 황색포도상구균에 항균활성을 나타낸다는 보고로 볼 때, 이 2가지 성분이 항균활성의 주성분인 것으로 사료된다.

Keywords

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