암대극(Euphorbia jolkini Boiss) 추출물의 항산화 및 항균활성

Antioxidative and Antimicrobial Activities of Euphorbia jolkini Extracts

  • 김지영 ((재)제주하이테크산업진흥원 제주생물종다양성연구소) ;
  • 이정아 ((재)제주하이테크산업진흥원 제주생물종다양성연구소) ;
  • 윤원종 ((재)제주하이테크산업진흥원 제주생물종다양성연구소) ;
  • 오대주 ((재)제주하이테크산업진흥원 제주생물종다양성연구소) ;
  • 정용환 ((재)제주하이테크산업진흥원 제주생물종다양성연구소) ;
  • 이욱재 ((재)제주하이테크산업진흥원 제주생물종다양성연구소) ;
  • 박수영 ((재)제주하이테크산업진흥원 제주생물종다양성연구소)
  • Kim, Ji-Young (Jeju Biodiversity Research Institute, Jeju Hi-Tech Industry Development Institute) ;
  • Lee, Jung-A (Jeju Biodiversity Research Institute, Jeju Hi-Tech Industry Development Institute) ;
  • Yoon, Weon-Jong (Jeju Biodiversity Research Institute, Jeju Hi-Tech Industry Development Institute) ;
  • Oh, Dae-Ju (Jeju Biodiversity Research Institute, Jeju Hi-Tech Industry Development Institute) ;
  • Jung, Yong-Hwan (Jeju Biodiversity Research Institute, Jeju Hi-Tech Industry Development Institute) ;
  • Lee, Wook-Jae (Jeju Biodiversity Research Institute, Jeju Hi-Tech Industry Development Institute) ;
  • Park, Soo-Yeong (Jeju Biodiversity Research Institute, Jeju Hi-Tech Industry Development Institute)
  • 발행 : 2006.10.01

초록

최근 약용식물로부터 특정성분을 추출하여 천연물이 가지는 2차 대사산물인 생리활성 물질에 대한 관심이 증대되고 있는데, 생리활성을 나타내는 물질 중 식품의 기능 강화를 위해 주로 활용되고 있는 것은 항산화 및 항균활성에 관련된 물질들이다. 이러한 식품강화 물질을 발굴하고자 해안가에 자생하며 유독성 식물로 알려진 암대극(E. jolkini)의 전초를 대상으로 ethanol 추출 및 용매분획하여 총 폴리페놀 함량을 분석하고 그에 따른 항산화활성 및 식품 유해 미생물에 대한 항균활성을 비교 측정하였다. 그 결과 암대극 (E. jolkini)은 다른 대극속 식물과 마찬가지로 페놀성 화합물을 다수 함유하고 있음을 확인할 수 있었으며, 총 폴리페놀 함량이 높게 나타난 ethylacetate 층에서 DPPH radical 소거활성, xanthine oxidase 저해활성, superoxide 소거활성 및 nitric oxide 소거활성의 $IC_{50}$ 값이 각각 $8.38\;{\mu}g/mL$, $466.01\;{\mu}g/mL$, $11.39\;{\mu}g/mL$, $332.11\;{\mu}g/mL$로 가장 우수한 항산화 활성을 보여 주었다. 항균활성은 paper disc method, 미생물 생장곡선 그리고 최대억제농도(MIC)을 측정 비교하였다. Paper disc method에서는 조추출물인 80% ethanol 및 ethylacetate와 butanol 분획물에서 농도가 증가할수록 항균력을 나타내는 inhibition zone 크기도 같이 증가하였으며, 특히 ethylacetate 분획물에서 가장 높은 항균력을 보여 주었다. 최대억제농도는 모든 균주에서 80% ethanol 추출물 및 ethylactate와 butanol 분획물에서 100 ppm 농도로 처리시 최소 생육저해 효과를 보였으며, 또한 암대극 추출물이 식품유해 미생물인 B. cereus, L. monocytogenes, E. coli 등 3 종의 균주를 대상으로 생육특성에 미치는 영향을 측정한 결과, ethylacetate 분획물이 가장 효율적인 항균활성을 보여 주었다.

The antioxidative and antimicrobial activities of Euphorbia jolkini extracts were investigated. Total polyphenohc compounds extracted were approximately as follows: 162.08 mg/g from ethanol, 12.64 mg/g from n-hexane, 48.11 mg/g from dichloromethane, 544.08 mg/g from ethyl acetate, 176.42 mg/g from butanol, and 30.00 mg/g from water. The ethylacetate fraction of this extraction showed the highest antioxidative activity $(IC_{50})$: DPPH radical scavenging capacity was measured at $8.38\;{\mu}g/mL$, xanthine oxidase inhibitory activity was $466.01\;{\mu}g/mL$, superoxide radical scavenging capacity was $11.39\;{\mu}g/mL$, and nitric oxide scavenging capacity was $332.11\;{\mu}g/mL$. Antimicrobial activities were determined by paper disc method and minimum inhibitory concentration of E. jolkini extracts against food-borne pathogens and spoilage bacteria. The growth inhibition curves of E. jolkini extracts against Bacillus cereus, Listeria monocytogenes, and Escherichia coli were also determined. These results suggest that the ethylacetate fraction of E. jolkini has strong antimicrobial activity against the all species of microorganisms as well as strong antioxidant activity.

키워드

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