Antimicrobial Activities of Green Tea Extract and Fractions on the E. coli O157:H7

Escherichia coli O157:H7균에 대한 녹차 추출물 및 분획물의 항균효과

  • Cho Sun-Young (School of Biotechnology and Bioengineering, Kangwon National University) ;
  • Choi Jae-Ho (School of Biotechnology and Bioengineering, Kangwon National University) ;
  • Ham Seung-Shi (School of Biotechnology and Bioengineering, Kangwon National University) ;
  • Oh Deog-Hwan (School of Biotechnology and Bioengineering, Kangwon National University)
  • 조선영 (강원대학교 바이오산업공학부) ;
  • 최재호 (강원대학교 바이오산업공학부) ;
  • 함승시 (강원대학교 바이오산업공학부) ;
  • 오덕환 (강원대학교 바이오산업공학부)
  • Published : 2005.03.01

Abstract

This study was investigated to determine the antimicrobial activity of ethanol extract of green tea, and of solvent fractionated ethanol extract on Escherichia coli O157:H7. MIC value of ethanol extracts and solvent fractionated ethanol extract (hexane, ethyl-acetate, chloroform and water) were $2000{\mu}g/ml,\;0,\;500{\mu}g/ml,\;2000{\mu}g/ml,\;1000{\mu}g/ml$, respectively. The antimicrobial activity of ethyl acetate fraction against E. coli O157 :H7 ranged from $250-2000{\mu}g/disk$. The antimicrobial activity was significantly increased as concentration dependent. When E. coli O157:H7 was pH-adjusted TSB containing $1000{\mu}g/ml$ ethyl acetate, E. coli O157:H7 was significantly inhibited at initial pH of 10, whereas the pathogen grew well in the presence of pH 4.5-pH 9. The inhibitory effect of the ethyl acetate fraction on the growth of E. coli O157 :H7 was investigated. Growth of both strain in the tested conditions were rapidly occurred up to 12 h, but no growth was occurred in the presence of $250-1000{\mu}g/mL$ of ethyl acetate fraction for 72 h.

본 연구는 시판되는 증자 녹차의 에탄을 추출물과 에탄을 추출물로부터 분획한 분획물로부터 최근 병원성 식중독균으로서 문제시되고 있는 E. coli O157:H7균에 대한 항균성을 검색하였다. 에탄을 추출물로부터 그 유효성분을 조사하기 위하여 핵산, 에틸아세테이트, 클로로포름 및 물로서 분획한 후 MIC를 검색한 결과 에틸아세테이트 분획물이 $500{\mu}g/ml$의 농도로 가장 강한 활성을 나타내었으며, 헥산 분획물은 활성이 없었다. 가장 강한 항균력을 나타낸 에틸아세테이트 분회물의 농도별 항균력 및 pH에 대한 영향을 조사한 결과 균종에 따라 차이는 있지만 3균주 모두 $250-2000{\mu}g/disk$농도에서 생육이 억제되었다. 또한 E. coli O157:H7균은 산성조건에서는 생육이 가능하지만 pH 10 이상의 강한 알칼리 조건에서는 생육이 크게 억제되었다. $35^{\circ}C$에서 E. coli O157:H7 933과 932균에 대한 에틸아세테이트 분획물의 농도별 생육저해 효과를 검색한 결과 두 균주 모두 $250{\mu}g/ml,\;500{\mu}g/ml$의 농도에서는 12시간 이후부터 생육하기 시작하였으나 $1000{\mu}g/ml$의 농도에서는 생육이 크게 저해되었다.

Keywords

References

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