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Antimicrobial Effect of Indigofera kirilowii Extracts on Food-borne Pathogens

산두근 추출물의 식중독성 미생물에 대한 항균효과

  • 배지현 (계명대학교 식품영양학과)
  • Published : 2004.08.01

Abstract

This study was performed to investigate the antimicrobial effect of the Indigofera kirilowii extracts against food-borne pathogens. The Indigofera kirilowii was extracted with methanol at room temperature, and fractionation of the methanol extract from Indigofera kirilowii was carried out by using petroleum ether, chloroform, ethyl acetate, and methanol, respectively. The antimicrobial activity of the Indigofera kirilowii extracts was determined using a paper disc method against food-borne pathogens and food spoilage bacteria. The ethyl acetate extract of Indigo/era kirilowii showed the highest antimicrobial activity against Staphylococcus aureus and Shigella dysenteriae. The water extract of Indigofera kirilowii showed relatively low antimicrobial activity against microorganisms used in this experiment. The synergistic effect has been found in combined extracts of Indigofera kirilowii and Pulsatilla koreana as compared to each extract alone. The growth inhibition curve was determined using ethyl acetate extracts of Indigofera kirilowii against S. aureus and S. dysenteriae. The ethyl acetate extract of Indigofera kirilowii showed strong antimicrobial activity against S. aureus at the concentration of 4,000 ppm. The 4,000 ppm of ethyl acetate extract from Indigofera kirilowii retarded the growth of S. aureus more than 24 hours and S. dysenteriae up to 48 hours. This study showed the possibility of using ethyl acetate extract of Indigofera kirilowii as a material of food preservative.

본 연구에서는 식중독 유발세균에 대한 항균활성이 우수한 천연 항균성 물질을 검색하기 위 해 예로부터 민간과 한방에서 널리 이용되어 온 산두근을 각종 유기용매로 추출하여 식중독 유발세균에 대한 항균활성을 조사해 보았다. 산두근을 methanol로 추출한 후, petroleum ether, chloroform, ethly acetate를 이용하여 실온에서 각각 용매별로 계통 분획하고, 열수추출물을 얻은 후,9종의 식중독 유발세균(Staphylococcus aureus, Bacillus cereus, Salmonella Enteritidis, Shigella flexneri, Escherichia coli, Salmonella Typhimurium, Shigella dysenteriae, Pseudomonas aruginosa, Shigella sonnei)에 대하여 항균효과를 조사하였다. 산두근 추출물의 농도별 항균 활성 검색에서는 산두근의 ethyl acetate추출물이 가장 큰 항균 효과를 보였으며 Staphylococcus aureus와 Shigella dysenteriae가 가장 민감하게 반응하는 균주였다. 산두근의 ethyl acetate 추출물과 백두옹의 ethyl acetate 추출물을 혼합하여 항균력을 측정 해 본 결과 두 추출물을 섞어 첨가했을 경우가 단독으로 사용했을 때보다 상승효과를 나타내었다. 또한 산두근의 ethyl acetate 추출물이 식중독 유발세균의 성장에 미치는 효과를 검정하기 위해 Staphylococcus aureus 및 Shigella dysenteriae의 배양액에 산두근의 ethyl acetate추출물을 각각 4,000 ppm 농도로 첨가했을 시, Staphylococcus aureus의 생육이 24시간 이상까지 억제됨을 관찰할 수 있었고, Shigella dysenteriae의 생육도 48시간까지 지연시킬 수 있었다. 이상의 결과 산두근의 ethyl acetate 추출물은 식품보존제 등의 신소재 물질로 활용가능성이 높음을 알 수 있었다.

Keywords

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