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

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Quality Characteristics of the Chungkookjang Fermented by the Mixed Culture of Bacillus natto and B. licheniformis

Bacillus natto와 B. licheniformis 혼합 Starter로 제초된 청국장의 품질특성

  • 연규춘 (충주대학교 식품공학과) ;
  • 김동호 (한국원자력연구소 방사선식품·생명공학연구팀) ;
  • 김정옥 (세종대학교 가정학과) ;
  • 육홍선 (세종대학교 가정학과) ;
  • 조재민 (충주대학교 식품공학과) ;
  • 변명우 (한국원자력연구소 방사선식품·생명공학연구팀)
  • Published : 2002.04.01
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Abstract

The quality characteristics and sensory evaluation of chungkookjang were investigated. The samples were prepared and fermented by the inoculation of Bacillus strains; B. subtilis, B. natto and B. licheniformis as a single starter, and mixed culture of B. natto and B. licheniformis on the industrialized model system. It was shown that microbial growth, protease activity, contents of amino-and ammonia-nitrogen and contents of organic acid were higher in B. subtilis inoculated sample, and were lower in B. licheniformis inoculated one. General quality characteristics of sample inoculated by mixed culture of B. natto and B. licheniformis took a middle position between each B. natto and B. licheniformis inoculated one. Fifty eight species of odor components were identified. Ethanol, 3-methyl-1-butanol, acetic acid, benzaldehyde and alkyl pyrazines were identified in all samples and most of other flavor components were strain specific. The contents of unpleasant smell components, alkyl pyrazines and benzaldehyde, were lower in B. licheniformis inoculated sample. The sensory evaluations showed that chungkookjang manufactured from mixed culture of B. natto and B.licheniformis was most acceptable. Therefore, results indicated that chungkookjang manufactured from mixed culture of B. natto and B. licheniformis induced better sensory quality than that of the control.

청국장의 산업적인 대량생산 system에 B. subtilis, B. natto, B. licheniformis 그리고 B. natto와 B. licheniformis의 혼합 균주를 starter로 하여 45시간 동안 청국장을 발효시키면서 각 시험제품의 미생물 생장, 일반성분, 효소활성, 향기성분 등을 분석하고 관능을 평가하였다. 청국장의 수분은 점질물의 형성이 많은 B.subtilis와 B. natto 시험구에서 다소높았으며 pH는 B. licheniformis에서 8.68로 가장 높았고 B. subtilis 에서 8.13으로 가장 낮았다. 미생물의 생장정도는 B. subtilis가 $10^{9}$ CFU/g까지, B. licheniformis는 $10^{8}$ CFU/g까지 생장하였으며 단백질분해효소의 활성은 B. subtilis에서 1.35 unit/g으로 가장 높았고 B. licheniformis에서 0.45 unit/g으로 가장 낮았다. 암모니아태 질소의 함량 은미생물의 생장률 및 단백질분해 효소의 활성에 비례하여 B. subtilis > B. natto> B. licheniformis의 순으로 높은 함량을 나타내었다. 한편, B. natto와 B. licheniformis의 혼합균주를 starter로 하여 제조한 청국장의 일반 품질은 B. natto와 B. licheniformis를 단독 접종한 제품의 평균치에 해당하는 특성을 보였다. 검출된 향기성분의 화학적 구성은 ketones 9종, alcohols 11종, aldehyde 6종, heterocyclic compounds 4종, ester 6종, acids 4종, hydrocarbons 4종, 기타 14종이었으며 균주별로는 B. subtilis에서 25종, B. natto에서 30종, B. licheniformis에서 28종, B. natto와 B. licheniformis를 혼합하여 접종한 청국장에서는 41종의 향기성분이 검출되었다. 유기산의 총량은 B. subtilis를 접종한 청국장에서 3.98%로 가장 높았고 B. natto는 2.24%, B. licheniformis는 1.53%이었으며 B. natto와 B. licheniformis의 혼합 시험구에서 는 1.67%의 함량을 보였다. 분석된 향기성분과 유기산은 starter로 접종된 Bacillus의 종류에 따라 각각 특징적 인 조성을 나타내었다. 관능평가 결과 색, 향, 맛 그리고 전체적인 선호도의 모든 항목에서 B. natto와 B. licheniformis의 혼합 시료가 가장 높은 선호도를 보였고 B. subtilis를 starter로 한 시료의 선호도가 가장 낮았다.

Keywords

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