Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Isolation and Characterization of Acetic Acid Bacteria for Producing "Makgeolli Seed-Vinegar"

막걸리 종초 제조에 적합한 초산균의 분리 및 발효특성

  • Lee, Hye-Bin (Department of Food Science and Technology, Chonbuk National University) ;
  • Oh, Hyeonhwa (Department of Food Science and Technology, Chonbuk National University) ;
  • Jeong, Do-Youn (Microbial Institute for Fermentation Industry (MIFI)) ;
  • Jun, Hyun-Il (Department of Food Science and Technology, Chonbuk National University) ;
  • Song, Geun-Seoup (Department of Food Science and Technology, Chonbuk National University) ;
  • Kim, Young-Soo (Department of Food Science and Technology, Chonbuk National University)
  • 이혜빈 (전북대학교 식품공학과) ;
  • 오현화 (전북대학교 식품공학과) ;
  • 정도연 ((재)발효미생물산업진흥원) ;
  • 전현일 (전북대학교 식품공학과) ;
  • 송근섭 (전북대학교 식품공학과) ;
  • 김영수 (전북대학교 식품공학과)
  • Received : 2017.07.19
  • Accepted : 2017.08.31
  • Published : 2017.10.31
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Abstract

Acetic acid bacteria strains were isolated from commercial natural vinegar. Ten isolated strains were identified using 16S rRNA gene sequencing data after evaluating the ethanol- and sulfur-tolerance. Eight of the strains isolated were identified as Acetobacter pasteurianus. A. pasteurianus JAC002, JAC005, and JAC008 strains, which showed a high ethanol tolerance, were selected for making "Makgeolli seed-vinegar". Rice wine vinegars were manufactured with the selected strains through fermentation, and their physicochemical properties and antimicrobial activities were evaluated. A. pasteurianus JAC002 strain showed the highest oxidation ability to acetic acid from ethanol on the twentieth day of fermentation, resulting in 4.21% total acidity, 3,791.77 mg% acetic acid content, and 2,931.78 mg% ethanol consumption content. Rice wine vinegar manufactured with the A. pasteurianus JAC002 strain showed increased antimicrobial activities against Staphylococcus aureus (KACC1927) and Escherichia coli (KACC10115). As a result, A. pasteurianus JAC002 strain was found to be the most suitable strain for "Makgeolli seed-vinegar".

자연발효식초로부터 acetic acid 생성능이 우수한 10종의 균주를 분리한 후 에탄올 저항성과 아황산 저항성을 평가하였고, 16S rRNA 염기서열을 분석하여 균주를 동정한 다음 명명하였다. 분리 동정된 10종의 균주 중 식품원료 사용 가능 균주인 Acetobacter pasteurianus는 8종으로 확인되었다. A. pasteurianus 8종 중 에탄올 저항성이 우수한 JAC002, JAC005, JAC008의 세 균주를 이용하여 막걸리 종초를 제조하였다. 진탕배양($30^{\circ}C$, 120 rpm) 조건에서 20일 동안 발효시키면서 막걸리 종초의 이화학적 특성, 유리당과 유기산의 변화, 유해균에 대한 항균 활성을 측정하였다. 선발 균주 중 A. pasteurianus JAC002 균주는 발효 20일 경과 후 총산도 4.21%, acetic acid 함량 3,791.77 mg%, 에탄올 소모량 2,931.78 mg%로 대조구나 다른 초산균에 비해 에탄올의 acetic acid 전환능이 우수하였다. 식품유해 지표균인 Staphylococcus aureus(KACC1927)와 Escherichia coli(KACC 10115)에 대한 항균 활성은 A. pasteurianus JAC002 균주가 접종된 막걸리 종초의 발효기간이 20일까지 경과했을 때 acetic acid 농도의 증가와 더불어 유의적으로 증가하는 것으로 확인되었다. 특히 A. pasteurianus JAC002 균주를 막걸리 종초 제조를 위한 종균으로 사용하였을 때 acetic acid 생성능이 우수하여 우점화가 유리하며 에탄올로부터 acetic acid로의 전환율이 높은 것으로 확인되었다. 따라서 이 막걸리 종초를 사용하여 다양한 원료의 식초를 제조한다면 식초의 풍미를 유지하면서 기능성을 증대시킬 것으로 기대된다.

Keywords

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