Food Science and Preservation (한국식품저장유통학회지)

The Korean Society of Food Preservation (한국식품저장유통학회)
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Physicochemical properties of Doenjang using grain type Meju fermented by Aspergillus oryzae and protease

Aspergillus oryzae와 단백질 분해효소 첨가에 따른 콩알메주 된장의 이화학적 특성 변화

  • Gil, Na-Young (Fermented Food Science Division, Department of Agrofood Resources, National Institute of Agricultural Science, RDA) ;
  • Choi, Bo-Young (Fermented Food Science Division, Department of Agrofood Resources, National Institute of Agricultural Science, RDA) ;
  • Park, Shin-Young (Fermented Food Science Division, Department of Agrofood Resources, National Institute of Agricultural Science, RDA) ;
  • Cho, Yong-Sik (Fermented Food Science Division, Department of Agrofood Resources, National Institute of Agricultural Science, RDA) ;
  • Kim, So-Young (Fermented Food Science Division, Department of Agrofood Resources, National Institute of Agricultural Science, RDA)
  • 길나영 (농촌진흥청 국립농업과학원 농식품자원부 발효식품과) ;
  • 최보영 (농촌진흥청 국립농업과학원 농식품자원부 발효식품과) ;
  • 박신영 (농촌진흥청 국립농업과학원 농식품자원부 발효식품과) ;
  • 조용식 (농촌진흥청 국립농업과학원 농식품자원부 발효식품과) ;
  • 김소영 (농촌진흥청 국립농업과학원 농식품자원부 발효식품과)
  • Received : 2017.08.02
  • Accepted : 2017.08.19
  • Published : 2017.08.30
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Abstract

The purpose of this study was to investigate the physiochemical properties of Doenjang was fermented by added with fungi and protease. The moisture content and pH of Doenjang added with protease (WP) were lower than those of control w/o protease while the contents of titratable acidity, reducing sugar, and amino-type nitrogen in WP were higher than control. The ${\alpha}$-amylase activities of Doenjang added with single and mixed Protease B were the highest at 4 weeks of fermentation period and protease activity of WP was about 4 times higher than that of control. The 4-9 kinds of free amino acids (proline, isoleucine, leucine, and phenylalanine etc.) in WP was increased in comparison with control. The DPPH radical scavenging activity and total polyphenol content were higher in WP than control. Total aerobic bacterial and fungal numbers were decreased depending on fermentation time regardless of addition of protease. In conclusion, the protease can be used as additives improving the quality and taste of fermented Doenjang.

본 연구는 A. oryzae를 접종하여 제조한 콩알메주 된장에 단백질 분해효소를 처리한 후 아미노태 질소, 유리아미노산 등 품질특성 변화를 조사하였다. 콩알메주 된장의 수분함량 및 pH는 단백질 분해효소 첨가 된장이 무첨가 된장보다 낮은 결과를 보였고, 염도와 색도는 단백질 분해효소에 따른 변화가 없었으며, 적정산도, 환원당 및 아미노태 질소는 단백질 분해효소 첨가 된장이 무첨가 된장보다 높은 결과를 보였다. ${\alpha}$-amylase 효소활성은 Aspergillus속 유래 단백질 분해효소 단독 및 혼합처리 된장의 경우 발효 4주차에 가장 높은 활성을 보인 반면, 단백질 분해효소 무첨가 된장은 거의 활성을 나타내지 않았고, protease 효소활성은 단백질 분해효소를 첨가한 된장의 경우 무첨가 된장보다 약 4배 높은 활성을 보였다. 무첨가 된장에 비해 단백질 분해효소처리 된장에서 Protease A 처리 시 arginine, lucine, tryptophan, phenylalanine 등 4종, Protease B 처리 시 histidine, serine, glycine, threonine, proline, isoleucine, lucine, phenylalanine 등 8종, Protease A+B 혼합처리 시 histidine, serine, glycine, threonine, proline, tryptophan, isoleucine, lucine, phenylalanine 등 9종의 유리아미노산이 증가하였다. DPPH 라디칼 소거 활성과 총 폴리페놀함량은 단백질 분해효소 첨가 된장의 경우 무첨가 된장보다 높은 값을 보였고, 총 균수와 곰팡이 수는 단백질 분해효소의 첨가 유무와 상관없이 발효가 진행됨에 따라 감소하였다. 이상의 결과를 종합하여 A. oryzae 접종 콩알메주 된장의 제조 시 단백질 분해효소를 첨가하여 발효시킬 경우 효소에 의해 환원당, 아미노태 질소 함량과 항산화능이 증가하고, ${\alpha}$-amylase와 protease 등 효소활성이 높아 된장의 발효기간을 단축시키면서 맛과 품질 개선에 도움이 될 것으로 기대된다.

Keywords

References

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