Korean Journal of Food Science and Technology (한국식품과학회지)

Korean Society of Food Science and Technology (한국식품과학회)
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The Use of the Pathogen-specific Bacteriophage BCP8-2 to Develop a Rice Straw-derived Bacillus cereus-free Starter Culture

단일 박테리오파지를 이용한 볏짚 유래 Bacillus cereus free 스타터 컬쳐의 개발

  • Bandara, Nadeeka (Department of Food Science and Technology, Chonbuk National University) ;
  • Chung, Seo-Jin (Department of Nutritional Science & Food Management, Ewha Womans University) ;
  • Jeong, Do-Youn (Sunchang Research Center for Fermentation Microbes) ;
  • Kim, Kwang-Pyo (Department of Food Science and Technology, Chonbuk National University)
  • Received : 2013.10.02
  • Accepted : 2013.11.11
  • Published : 2014.02.28
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Abstract

The purpose of this study was to develop a rice straw-derived Bacillus cereus (B. cereus)-free starter culture for traditional soybean fermented products using a B. cereus-specific bacteriophage, BCP8-2. To determine the optimal medium that supports the growth of rice straw-derived microorganisms and BCP8-2 activity, 5 different culture media were tested. The 5% ground bean (GB) medium was selected for further study. No B. cereus was detected in the BCP8-2-treated rice straw in GB medium, whereas B. cereus at a level of $10^7$ CFU/mL was recovered in the no-phage control. The total bacterial count reached approximately $10^9$ CFU/mL regardless of phage addition. When the 16S rRNA sequence-based microbial community was monitored using denaturing gradient gel electrophoresis (DGGE) and pyrosequencing, a similar microbial community was observed in the phage-treated and control samples. In conclusion, we demonstrate that phage can be used to prepare a rice straw-derived B. cereus-free starter culture with minimal effect on natural microflora.

본 연구는 목적은 단일 박테리오파지를 이용하여 볏짚으로부터 B. cereus가 제거된 스타터 컬쳐를 개발하는 것이다. 다양한 배지 가운데 5% 콩 갈은 물(GB)이 볏짚 미생물의 증식과 박테리오파지 BCP8-2의 활성에 적합한 배지로 선정되었다. GB를 이용하여 다양한 볏짚 샘플과 BCP8-2를 함께 처리한 결과 모든 샘플들에서 총균수는 $10^9$ CFU/mL 수준으로 동일하였고, B. cereus의 경우 BCP8-2를 처리하지 않은 샘플에서 $10^7$ CFU/mL까지 증식하였고, 박테리오파지 처리군에서는 검출되지 않음을 확인하였다. 샘플에 존재하는 미생물 군집을 16S rDNA 염기서열을 바탕으로 한 DGGE와 pyrosequencing을 통해 분석한 결과 BCP8-2 처리군과 미처리군 사이에 매우 유사한 미생물 군집을 확인하였고, 더 나아가 계대 배양에 따른 미생물 군집이 안정적으로 유지됨을 확인했다. 이러한 결과들은 볏짚 등에서 특정 박테리오파지를 이용하여 특정 유해균을 제거한 컬쳐의 개발이 가능함을 보여주는 것이고, 안전한 전통장류의 생산에 기여할 것이다.

Keywords

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