Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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Isolation and Cultural Conditions of an with Antifungal Activity Bacillus sp.

항진균성 활성 Bacillus sp.의 분리 및 생산 조건

  • Chung, Yong-Joon (School of Alternative Medicine and Health Science, Jeonju University)
  • 정용준 (전주대학교 대체건강관리학부)
  • Received : 2009.11.06
  • Accepted : 2009.11.20
  • Published : 2009.11.30
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Abstract

An antifungal antibiotic-producing bacterium was isolated from soil and identified as Bacillus sp. CJ-1. The culture supernatant was found to have a strong and stable antifungal activity against Colletotrichum gloeosporioides. Culture conditions for the maximum antifungal activity were examined. Glucose and yeast extract were selected as the best carbon and nitrogen sources. The optimum C/N ratio was 3. The optimum temperature and initial pH were determined as $35^{\circ}C$ and 6.0, respectively. Under these conditions, the production for the antibiotic was maximized at 72 hr at $35^{\circ}C$ after cultivation. Microscopic observation showed that the culture supernatant of Bacillus sp. CJ-1 had a strong inhibitory activity on the mycelial growth of the test strain at above $12.5\;{\mu}L\;mL^{-1}$ of concentration.

새로운 항진균성 항생물질개발을 목적으로 고추탄저병균인 Colletotrichum gloeosporioides에 대한 항생활성을 가지는 미생물을 토양으로부터 분리하여 동정한 결과, Bacillus sp. CJ-1로 동정하였다. 항생물질의 생산을 위한 배양조건을 검토한 결과, glucose 1.5% (w/v), yeast extract 0.5% (w/v), pH 6.0의 배지를 사용하여 $35^{\circ}C$에서 72시간 진탕 배양하였을 때 항진균활성이 가장 좋았으며, 이때 피검균인 C. gloeosporioides에 대한 배양액의 생육저지환은 약 27.8mm로 최대의 활성을 보여주었다. 피검균인 C. gloeosporioides에 대한 배양액의 생육저지현상을 현미경을 통해 관찰한 결과 배양액 $12.5\;{\mu}L\;mL^{-1}$이상의 농도에서 뚜렷한 생육저해현상을 관찰할 수 있었으며 이는 피검균 포자의 발아억제현상과 연관되어 있을 것으로 추측된다.

Keywords

References

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