Korean Journal of Food Science and Technology (한국식품과학회지)

Korean Society of Food Science and Technology (한국식품과학회)
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Characteristics of butyric acid bacterium, Clostridium butyricum DIMO 52, isolated from feces of Korean breastfeeding infants

국내 모유수유 유아의 분변에서 분리한 낙산균 Clostridium butyricum DIMO 52의 특징

  • Mo, SangJoon (Medical Laser Research Center, Dankook University)
  • 모상준 (단국대학교 의학레이저연구센터)
  • Received : 2021.09.23
  • Accepted : 2021.11.10
  • Published : 2021.12.31
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Abstract

After isolating the DIMO 52 strain with a large inhibition zone diameter for Clostridium perfringens and maximum butyric acid production from the fecal sample of a breastfeeding infant, it was identified as Clostidium butyricum. The maximum growth of the DIMO 52 strain was reached 24 h after inoculation, and the maximum butyric acid concentration was approximately 34.73±4.27 mM. The DIMO 52 strain survived approximately 67.5% of the initial inoculum at pH 2.0, and approximately 64.9% survived in RCM broth supplemented with 0.3% (w/v) oxgall. In addition, DIMO 52 showed antibacterial activity against Escherichia coli KCTC 2441 and Salmonella Typhimurium KCTC 1925. In LPS-stimulated RAW264.7 cells, 1×103 CFU/mL viable cells of the DIMO 52 strain also exhibited significant NO (nitric oxide) production inhibitory activity (33%, p<0.01). This result suggests that C. butyricum DIMO 52 has anti-inflammatory activity related to NO radical-scavenging activity. In conclusion, C. butyricum DIMO 52 isolated in this study has the potential to be used as a probiotic.

Clostidium butyricum을 분리하기 위하여 국내 모유수유 신생아 분변으로부터 혐기성 균주를 선별하였고 버블을 생성하는 100개의 균을 확보하였다. 이중 Clostridium perfringens에 대한 항균력과 butyric acid의 생산이 가장 우수한 DIMO 52 균주를 선발하였고, 형태학적 특성, 생리 생화적 특성 및 16S rRNA 유전자 분석을 통하여 C. butyricum으로 동정되어 C. butyricum DIMO 52로 명명하였다. 성장률, butyric acid 생산 및 pH 변화를 배양 36시간 동안 모니터링하였다. 배양 24시간 후 DIMO 52 균주의 최대 성장에 도달하였고, butyric acid 최대 농도는 대략 34.73±4.27 mM이었으며, pH는 7.2에서 2.5로 변경되었다. DIMO 52 균주는 낮은 pH와 oxgall에 높은 저항성이 있다. pH 2에서 2시간 동안 접종의 약 67.5%의 유의성 있는 생존율을 보였다(p<0.05). 그리고, 0.3% oxgall이 함유된 RCM 액체배지에서 24시간 동안 접종의 약 64.9%의 유의성 있는 생존율을 보였다(p<0.05). 또한, DIMO 52은 Escherichia coli KCTC 2441와 Salmonella Typhimurium KCTC 1925에 대해 억제효과를 나타냈다. 두 균주에 대한 항균효과는 아마도 butyric acid에 의한 낮은 pH 때문인 것으로 보였다. 5×103 CFU/mL 생균수 까지는 RAW264.7 세포에 세포독성이 없는 것으로 관찰되었고, NO 생성을 억제할 수 있는 최저 균수를 확인한 결과 약 1×103 CFU/mL 생균수에서 LPS만 처리한 군 대비 약 33%의 NO 생성을 억제하는 것으로 분석되었다(p<0.01). 이 결과는 C. butyricum DIMO 52이 NO radical 소거 및 항염증 활성을 가지고 있음을 시사한다. 결론적으로, 본 연구에서 분리된 C. butyricum DIMO 52의 프로바이오틱스 특성을 확인하였다.

Keywords

Acknowledgement

이 논문은 2020년도 정부(교육부)의 재원으로 한국연구재단의 지원을 받아 수행된 기초연구 사업임(NRF-2020R1A6A1A03043283). 또한 한국기초과학원 국가연구시설장비진흥센터의 지원을 받아 수행된 연구임(과제관리번호: 2019R1A6C1010033).

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