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메주 발효 관련 Bacillus, Enterococcus, Staphylococcus 속 우점종 확인

Identification of the Predominant Bacillus, Enterococcus, and Staphylococcus Species in Meju, a Spontaneously Fermented Soybean Product

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키워드

주제분류생물학

초록

국내 5개 지역에서 수집한 12개 메주로부터 Bacillus, Enterococcus, Staphylococcus 속 bacteria를 선택배지를 이용하여 분리하고, 16S ribosomal RNA 유전자 및 gmk (guanylate kinase) 유전자 염기서열분석을 통해 동정하여, 이들 속의 우점종을 검토하였다. Bacillus 속과 Enterococcus 속은 모든 시료로부터 검출되었고, Bacillus 속은 11개 시료에서 총균수 대비 15% 이상 검출되어 메주 발효에서 가장우점하는 bacteria로 확인되었다. Staphylococcus 속은 6개시료에서만 검출되었다. Bacillus 속으로 동정된 151개 분리주는 B. velezensis, B. sonorensis 순으로 우점하였고, B. subtilis, B. licheniformis가 그 뒤를 이었다. Enterococcus 속으로 동정된 165개 분리주 중, 163균주가 E. faecium으로확인되었다. Staphylococcus 속으로 동정된 82개 분리주에는 6종의 coagulase-negative Staphylococcus 존재가 확인되었고, S. xylosus가 우점종으로 확인되었다.

Abstract

Meju is a spontaneously fermented soybean product produced in Korea. We isolated the bacteria of the genera Bacillus, Enterococcus, and Staphylococcus from 12 meju samples collected from five regions of Korea using selective media, and we identified them based on the sequence analysis of 16S ribosomal RNA and gmk (guanylate kinase) genes. Bacillus and Enterococcus strains were identified from all samples and the numbers of Bacillus strains in the 11 samples were >15% of the total cell number. Therefore, the genus Bacillus was confirmed as the predominant bacterial group of meju. Staphylococcus strains were identified from six samples. The identified 151 Bacillus isolates predominated in the following order: B. velezensis, B. sonorensis, B. subtilis, and B. licheniformis. Among the 165 Enterococcus isolates, 163 strains were identified as E. faecium. Eighty-two Staphylococcus isolates were classified into six species of coagulase-negative Staphylococcus group and S. xylosus was the predominant species.

참고문헌 (30)

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