Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Functional evaluation of sourdough containing lactic acid bacteria isolated from sliced radish kimchi

깍두기로부터 분리된 유산균으로 제조한 사워도우의 기능성 평가

  • Lim, Eun-Seo (Department of Food Science & Nutrition, Tongmyong University) ;
  • Kim, Young-Mog (Division of Food Science and Biotechnology, Pukyong National University) ;
  • Lee, Eun-Woo (Department of Life Science and Biotechnology, Dongeui University)
  • Received : 2017.06.07
  • Accepted : 2017.06.30
  • Published : 2017.09.30
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Abstract

The purpose of this study is to investigate the antioxidative and antimicrobial activities of sourdough fermented with the lactic acid bacteria (LAB) isolated from sliced radish kimchi. According to 16S rRNA gene sequence analysis, the isolated lactic acid bacteria were categorized as Leuconostoc dextranicum SRK03, Lactobacillus brevis SRK15, Pediococcus halophilus SRK22, Lactobacillus acidophilus SRK30, Lactobacillus plantarum SRK38, Leuconostoc citreum SRK 42, and Lactobacillus delbrueckii SRK60 with sequence similarity of 99%. After fermentation with L. dextranicum SRK03, L. acidophilus SRK30, L. plantarum SRK38 or L. delbrueckii SRK60 and Saccharomyces cerevisiae KCTC 7246 at $30^{\circ}C$ for 24 h LAB and yeast in sourdough were present at levels of $10^9$ and $10^7CFU/g$, respectively. In particular, the titratable acidity and ethanol and exopolysaccharide contents of sourdough fermented with L. dextranicum SRK03 were also significantly (P < 0.05) higher than those of sourdough fermented with L. acidophilus SRK30, L. plantarum SRK38, or L. delbrueckii SRK60. The sourdough fermented with L. dextranicum SRK03 and L. acidophilus SRK30 showed not only good DPPH radical-scavenging capacity but anti-lipid peroxidation activity. In addition, the viable counts of Bacillus cereus ATCC 11778 and Staphylococcus aureus ATCC 6538 in sourdough during storage for 5 days at $25^{\circ}C$ were significantly (P < 0.05) lower than those of pathogenic bacteria in the control group due to the organic acids and bacteriocin produced by L. acidophilus SRK30 strain.

본 연구에서는 깍두기로부터 분리한 유산균으로 발효시킨 사워도우의 항산화 및 항균 활성을 조사하였다. 염기서열 분석을 통해 분리 균주는 99%의 상동성을 가진 Leuconostoc dextranicum SRK03, Lactobacillus brevis SRK15, Pediococcus halophilus SRK22, Lactobacillus acidophilus SRK30, Lactobacillus plantarum SRK38, Leuconostoc citreum SRK 42 및 Lactobacillus delbrueckii SRK60으로 동정되었다. L. dextranicum SRK03, L. acidophilus SRK30, L. plantarum SRK38 혹은 L. delbreckii SRK60과 Saccharomyces cerevisiae KCTC 7246을 혼합하여 $30^{\circ}C$에서 24시간 발효시킨 사워도우의 유산균과 효모수는 각각 $10^9$ 및 $10^7CFU/g$이었으며, 특히 L. dextranicum SRK03으로 제조한 사워도우는 L. acidophilus SRK30, L. plantarum SRK38 및 L. delbreckii SRK60 보다 유의하게 높은 총 산도와 에탄올 및 세포 외 다당류 함량을 나타내었다. L. dextranicum SRK03 및 L. acidophilus SRK30으로 제조한 사워도우는 DPPH 라디칼 소거능과 유지의 과산화 억제능도 높았다. 게다가 L. acidophilus SRK30이 생산한 유기산과 박테리오신에 의해 $25^{\circ}C$에서 5일간 저장하는 동안 사워도우 내 Bacillus cereus ATCC 11778과 Staphylococcus aureus ATCC 6538의 균수는 유의하게 낮은 수준을 유지되었다.

Keywords

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