Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Microbiological and chemical properties of sourdough fermented with probiotic lactic acid bacteria

프로바이오틱 유산균으로 제조한 사워도우의 미생물학적 및 이화학적 특성

  • Lim, Eun-Seo (Department of Food Science & Nutrition, Tongmyong University)
  • 임은서 (동명대학교 식품영양학과)
  • Received : 2016.03.03
  • Accepted : 2016.03.17
  • Published : 2016.03.31
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Abstract

Isolates from Korean fermented soybean paste were identified as Enterococcus faecium SBP12, Pediococcus halophilus SBP20, Lactobacillus fermentum SBP33, Leuconostoc mesenteroides SBP37, Pediococcus pentosaceus SBP41, Lactobacillus brevis SBP49, Lactobacillus acidophilus SBP55, and Enterococcus faecalis SBP58 according to conventional morphological and biochemical characteristics, carbohydrate fermentation profiling, and 16S rRNA sequence comparison. Strain SBP20, SBP33, SBP49, and SBP55 showed very resistance to simulated gastric and intestinal juices with final populations exceeding 6 log CFU/ml, whereas cells of SBP12 and SBP58 after exposure to low pH were dramatically decreased within 2 h. Among 4 strains having good tolerance to gastrointestinal conditions, the high adhesive ability to HT-29 cells, antibiotic resistance, and antimicrobial activity against food-borne pathogens Bacillus cereus ATCC 11778 and Staphylococcus aureus ATCC 6538 were observed with SBP49 and SBP55, therefore, these two strains were confirmed as putative probiotic candidates. There was no significant difference between the sourdoughs fermented with SBP49 and SBP55 with respect to the values of pH, total titratable acidity, and viable cell count. During sourdough fermentation, SBP49 strain produced significantly greater amounts of lactic acid than SBP55 strain, which secreted large quantities of hydrogen peroxide. SBP49 and SBP55 strains producing the antimicrobial substances such as lactic acid, hydrogen peroxide, and bacteriocin effectively inhibited B. cereus and S. aureus inoculated in the sourdough.

재래식 된장으로부터 분리된 유산균은 형태학적, 생화학적 특성과 당 발효능 및 16S rRNA 염기서열 분석을 통해 Enterococcus faecium SBP12, Pediococcus halophilus SBP20, Lactobacillus fermentum SBP33, Leuconostoc mesenteroides SBP37, Pediococcus pentosaceus SBP41, Lactobacillus brevis SBP49, Lactobacillus acidophilus SBP55 및 Enterococcus faecalis SBP58로 동정되었다. SBP20, SBP33, SBP49와 SBP55 균주는 인공 위액과 담즙액 내에서 6 log cycle 이상 생균수를 유지하였으나, SBP12와 SBP58은 낮은 pH 하에서 2시간만에 균수가 급격하게 감소되었다. 특히, SBP49와 SBP55는 HT-29 세포에 대한 부착능이 높고, 항생제에 대한 저항성이 크며, Bacillus cereus ATCC 11778과 Staphylococcus aureus ATCC 6538의 식중독균에 대한 항균활성을 나타내었으므로, 이 두 균주는 프로바이오틱 선발 기준에 적합한 것으로 추정된다. 게다가 SBP49와 SBP55를 이용하여 사워도우를 제조한 결과, 발효 직후 도우 내 pH, 산도 및 유산균수에는 유의한 차이가 없었으나, SBP49는 많은 양의 유산을 생산한 반면, SBP55는 과산화수소를 더 많이 생산하였다. SBP49와 SBP55 유산균은 유산과 과산화수소뿐만 아니라 박테리오신 등의 항균물질을 생산하므로 사워도우 내 존재하는 식중독균 저해에 효과적이었다.

Keywords

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