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Antimicrobial Effect of Rubia akane Nakai Extract on Food-Borne Pathogens

식중독유발 세균의 증식에 미치는 천초근 추출물의 영향

  • Bae, Ji-Hyun (Dept. of Food Science and Nutrition, Keimyung University) ;
  • Jang, Hye-Jung (Dept. of Food Science and Nutrition, Keimyung University) ;
  • Jung, Jung-Im (Dept. of Food Science and Nutrition, Keimyung University)
  • 배지현 (계명대학교 식품영양학과) ;
  • 장혜정 (계명대학교 식품영양학과) ;
  • 정정임 (계명대학교 식품영양학과)
  • Published : 2005.03.01

Abstract

This study was performed to investigate the antimicrobial activity of the Rubia akane Nakai extract against food-borne pathogens. First, the Rubia akane Nakai was extracted with methanol at room temperature and the fractionation of the methanol extract was carried out by using petroleum ether, chloroform, and ethyl acetate, and methanol. The antimicrobial activity of the Rubia akane Nakai extract was determined by using a paper disc method against food-borne pathogens and food spoilage bacteria. The methanol extract of Rubia akane Nakai showed the highest antimicrobial activity against Bacillus cereus and Pseudomonas aeruginosa. Synergistic antimicrobial effect was observed when Rubia akane Nakai extract was mixed with Viscum album var. coloratum extract as compared to each extract alone. Finally, the growth inhibition curves were determined by using methanol extract of Rubia akane Nakai against Bacillus cereus and Pseudomonas aeruginosa. The methanol extract of Rubia akane Nakai had strong antimicrobial activity against Pseudomonas aeruginosa at the concentration of 4,000 ppm. At this concentration, the growth of Pseudomonas aeruginosa was retarded more than 72 hours and up to 48 hours for Bacillus cereus. From these results, it was concluded that the methanol extract of Rubia akane Nakai inhibited effectively Bacillus cereus and Pseudomonas aeruginosa.

약리실험 결과 강심작용, 지혈촉진작용, 항균작용, 항암작용 등이 밝혀진바 있는 천초근을 이용하여 항균성 및 천연 식품보존제로서의 이용가능성을 검색하여 보았다. 먼저 천초근의 뿌리성분을 petroleum ether, chloroform, ethylaetate, methanol 및 증류수를 이용하여 항균성분을 추출하여 9종의 식중독균(Staphylococcus aureus, Bacillus cereus, Salmonella Enteritidis, Shigella flexner, Escherichia coil, Salmonella Typhi, Shigella dysenteriae, Pseudomonas aeruginosa, Shigella sonnei)에 추출물의 농도를 250ppm, 500 ppm, 1,000ppm으로 달리하여 disc method로 실험한 결과 Salmonella Typhimurium애서 아주 약한 clear zone이 형성되긴 하였으나 거의 모든 균에서 항균작용이 있는 것으로 나타났다. 가장 큰 clear zone이 형성된 균은 Pseudomonas aeruginosa였고 추출물의 농도가 높아질수록 비례하여 항균효과가 크게 드러났다. 또 methanol 추출물에서 항균활성이 가장 잘 나타났으며 그 다음으로는 ethylacetate, chloroform, petroleum ether, 증류수 순이었다. 항균활성이 가장 잘 나타난 천초근의 methanol 추출물과 또 다른 겨우살이 추출물을 사용한 상승효과 여부를 알아보기 위한 실험결과 그람 양성균인 Bacillus cereus와 그람 음성균인 Pseudomonas aeruginosa에 대해 상승적인 항균효과를 나타내었다. 천초근의 methanol 추출물이 Bacillus cereus와 Pseudomonas aeruginosa균의 성장에 미치는 효과를 검정해 본 바 천초근 추출물의 농도가 진해짐에 따라 균의 증식을 억제하는 것으로 나타났고 Pseudomonas aeruginosa에서 더 두드러지게 증식이 억제되었다. 또 72시간 동안 그 성장 억제 효과가 지속됨을 알 수 있었다.

Keywords

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