양법을 이용한 누룩 발효 관련 Bacillus 속, Staphylococcus 속 세균 및 유산균의 우점종 확인
Identification of the Predominant Species of Bacillus, Staphylococcus, and Lactic Acid Bacteria in Nuruk, a Korean Starter Culture
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초록
우리나라 4개 지역에서 상업적으로 제조한 8개 누룩을 구입하여 Bacillus 속, Staphylococcus 속 및 유산균을 선택적으로 검출할 수 있는 배지를 이용하여 세균을 분리하고, 최근 확립된 분류기준에 따라 동정하여 세균의 그룹 별 다양성 및 우점종을 검토하였다. 모든 시료로부터 Bacillus 속이검출되었지만, 3개 시료에서는 Staphylococcus 속 또는 유산균이 검출되지 않았다. 유산균이 가장 많이 검출된 1개 시료를 제외한 7개 시료에서 Bacillus 속이 가장 많이 계수되었고, Staphylococcus 속은 가장 적은 수로 검출되었다. Bacillus 속 6개 종의 존재가 확인되었고, B. subtilis, B. velezensis, B. licheniformis가 우점으로 검출되었다. Staphylococcus 속 9개 종의 존재가 확인되었고, coagulase 음성 S. pseudoxylosus와 S. saprophyticus의 우점을 확인했다. 유산균은 Enterococcus 속, Lactobacillus 및 근연속, Pediococcus 속, Weissella 속 10종의 존재가 확인되었고, P. pentosaceus가 우점종으로 확인되었다
Abstract
Nuruk is a starter culture of Korea manufactured by spontaneous fermentation of grains. We isolated bacteria of the genera Bacillus and Staphylococcus, and lactic acid bacteria (LAB) from eight commercial nuruk samples collected from four districts of Korea using selective agar media and identified them based current taxonomic standards. Bacillus was detected in all samples, but Staphylococcus or LAB were not detected in three samples. In seven samples, except one sample scored the highest cell number of LAB, Bacillus and Staphylococcus were counted as the highest and the lowest numbers, respectively. Six species of Bacillus were identified, and B. subtilis, B. velezensis, and B. licheniformis were predominant species. Nine species of coagulase-negative Staphylococcus were identified, and the predominance of S. pseudoxylosus and S. saprophyticus was confirmed. Ten species of LAB including Enterococcus, Lactobacillus and close relatives, Pediococcus, and Weissella were identified. P. pentosaceus was identified as the predominant species.
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