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 the Fractions Extracted from a Lotus (Nelumbo nucifera) Leaf

연잎 추출물의 항균 효과

  • 이경석 (호서대학교 식품생물공학과) ;
  • 오창석 (호서대학교 식품생물공학과) ;
  • 이기영 (호서대학교 식품생물공학과)
  • Published : 2006.02.01
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Abstract

In this study the antimicrobial activity of the extract from leaves of lotus (Nelumbo nucifera) was evaluated in comparison with benzoic acid. The $70\%$ ethanol extract was fractionated subsequently by hexane, chloroform, ethyl acetate, butanol and water, and the antimicrobial activity of each dried fraction was tested by paper disk diffusion method. The ethyl acetate fraction exhibited strong antimicrobial activity on the five strains of food born bacteria e.g. Bacillus subtilis, Staphylococcus aureus subsp. aureus, Escherichia coli, Salmonella Typhimurium and Pseudomonas nuorescens. The antimicrobial activity of the fraction was stronger than benzoic acid and showed no appreciable difference between on $Gm^+$ and $Gm^-$ bacteria. Heat treatment of the fraction at $110^{\circ}C$ for 1 hr did not change the degree of inhibitory effect. The ethyl acetate fraction showed almost perfect growth inhibition on the tested strains at over 800 ppm.

본 연구에서는 연잎 추출분획물의 항균 활성을 benzoic acid와 비교, 검토하고자 하였다. $70\%$ ethanol 추출물을 hexane, chloroform, ethyl acetate, butanol, water로 순차 분획하여 총 페놀함량을 비교한 결과 ethyl acetate분획물이 가장 높은 함량을 보여주었다. 항균활성 또한 ethyl acetate 분획물에서 가장 우수한 활성을 보여주었으며 benzoic acid 보다 높은 활성을 나타냈다. Gram 양성균과 음성균간 항균력의 차이는 보이지 않았다. Liquid culture에서 생육저해 효과를 측정한 결과 추출물의 농도가 800 ppm이상일 경우 생장이 완전히 억제되었다.

Keywords

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