Inhibition of Foodborne Pathogens and Spoilage Bacteria and Their Structural Changes by Ethanol Extract of Schizandra chinensis Baillon

오미자 에탄올 추출물에 의한 식품위해성 세균의 증식 억제 및 세포구조 변화

  • Kim, Se-Ryoung (Dept. of Food Science and Nutrition, Kyungpook National University) ;
  • Kim, Mee-Ra (Dept. of Food Science and Nutrition, Center for Beautiful Aging, Kyungpook National University)
  • 김세령 (경북대학교 식품영양학과) ;
  • 김미라 (경북대학교 식품영양학과.장수생활과학연구소)
  • Received : 2012.01.12
  • Accepted : 2012.02.23
  • Published : 2012.02.29

Abstract

This study analyzed the antibacterial activity of the ethanol extract of Schizandra chinensis Baillon against food pathogenic microorganisms to determine its capabilities as a natural antimicrobial agent. A paper disc diffusion test, minimum inhibitory concentration (MIC) determination, and time-kill assay showed that the ethanol extract strongly inhibits the growth of Listeria monocytogenes, Bacillus cereus, Escherichia coli O157:H7, and Pseudomonas aeruginosa. Release of cytoplasmic ${\beta}$-galactosidase was detected in E. coli, E. coli O157:H7, S. aureus, and P. aeruginosa treated with the ethanol extract. An increase of outer membrane permeability caused by the ethanol extract was also observed. An outward flow of cell constituents was detected in the Gram negative strains treated with the ethanol extract. These results imply that the inner and outer membranes of cells were partially destroyed and cell constituents were released by the treatment of the S. chinensis Baillon ethanol extract. The results of this study indicate that ethanol extract of S. chinensis Baillon evidences a fairly good antibacterial effect.

본 연구에서는 오미자 에탄올 추출물의 천연 항균제로서의 이용 가능성을 살펴보기 위하여 식품 위해성 세균에 대한 항균활성을 측정하였다. Paper disc diffusion test와 최소저해 농도(MIC) 측정에서는 오미자 에탄올 추출물이 Listeria monocytogenes, Bacillus cereus, Escherichia coli O157:H7에 대해 큰 생육저해환과 낮은 MIC를 나타내었다. Time-kill assay에서는 L. monocytogenes의 생육이 오미자 에탄올 추출물에 의해 가장 저해되는 것으로 나타났다. 또한 오미자 에탄올 추출물을 처리한 E. coli, E. coli O157:H7, Staphylococcus aureus, Pseudomonas aeruginosa에서는 ${\beta}$-galactosidase와 o-nitrophenyl-${\beta}$-D-galactoside가 높은 반응을 나타냄으로써 오미자 에탄올 추출물로 인해 세포막 손상이 유발됨을 유추할 수 있었다. 또한 E. coli, E. coli O157:H7, P. aeruginosa, Salmonella Typhimurium 등 그람음성균에서는 오미자 에탄올 추출물의 처리 농도가 높을수록 세포구성물의 유출과 세포 외막의 투과성이 증가하는 현상이 나타났다. 시차주사현미경(SEM)과 투과전자현미경(TEM)을 이용하여 관찰한 세포구조에서도 오미자 에탄올 추출물 처리 시 세포막의 부분적인 파괴와 세포 팽윤이 일어난 것을 확인할 수 있었다. 따라서 이들 결과는 오미자 에탄올 추출물이 식품위해성 세균에 대해 높은 항균 활성을 가지고 있으며, 천연 항균소재로서의 이용 가능성이 있음을 보여주었다.

Keywords

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