한국식품과학회지 (Korean Journal of Food Science and Technology)

한국식품과학회 (Korean Society of Food Science and Technology)
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청국장으로부터 Bacillus cereus에 대한 길항 균주 분리 및 길항 효과

Isolation of Bacillus spp. from Cheonggukjang and Its Antagonistic Effect against Bacillus cereus

  • Lee, Nam-Keun (Department of Biotechnology, Chung-Ang University) ;
  • Park, Joung-Whan (Department of Biotechnology, Chung-Ang University) ;
  • Cho, Il-Jae (Department of Biotechnology, Chung-Ang University) ;
  • Kim, Byung-Yong (Department of Food Science & Biotechnology, Institute of Life Sciences and Resources, Kyung-Hee University) ;
  • Kwon, Ki-Ok (Sangchon Food) ;
  • Hahm, Young-Tae (Department of Biotechnology, Chung-Ang University)
  • 발행 : 2008.12.31
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초록

청국장 내에 B. cereus을 효과적으로 저지하기 위한 생물학적제어 방법의 개발을 위하여 전통적 방법으로 제조한 백태 및 흑태 청국장으로부터 총 20종의 Bacillus 속 균주를 분리하였고, 이중에서 24시간 배양액에서 B. cereus에 대한 길항활성이 가장 높은 Bacillus sp. SC-8 균주를 선별하였다. 이 균주를 B. cereus와 혼합하여 청국장을 제조한 후 길항능을 분석한 결과 청국장 발효 중에는 B. cereus에 대한 길항효과가 있었으나, 발효 후 $4^{\circ}C$ 저장 중에는 균체수가 감소하여 억제효과가 감소하는 것으로 분석되었다. 또한 대조군으로 사용하였던 Bacillus sp. SC-15 균주에서는 배양액에서는 B. cereus에 대한 길항 활성이 낮았으나 청국장 내에서는 길항효과를 보임에 따라 청국장 발효에 관여하는 균들은 배양 환경에 따라 길항물질의 생성에 차이가 있음을 보였다.

For the development of a biological control method against B. cereus in cheonggukjang, 20 Bacillus spp. were isolated from the naturally fermented baektae and heuktae cheonggukjang, identified by using 16S rDNA sequences. Among the isolated strains, Bacillus sp. SC-8 was selected using the B. cereus lawn cell assay as an antagonistic microorganism against B. cereus. The culture medium of Bacillus sp. SC-8 after 24 hr of incubation at $37^{\circ}C$ also evidenced a high level of antagonistic activity. In cheonggukjang fermented with the mixed culture of Bacillus sp. SC-8 and B. cereus, antagonistic effect against B. cereus was maintained during the fermentation of cheonggukjang, while its effect was reduced during storage at $4^{\circ}C$ due to the decrement of cell population of Bacillus sp. SC-8. In Bacillus sp. SC-15, which was utilized a control, antagonistic activity against B. cereus was not demonstrated on the lawn cell plate assay and culture medium, but its effects were detected in cheonggukjang. Therefore, the production of antagonistic substances of Bacillus spp. depends on the fermentative environment.

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