Food Science and Preservation (한국식품저장유통학회지)

The Korean Society of Food Preservation (한국식품저장유통학회)
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Effects of Inoculation of Bacillus subtilis Cells on the Fermentation of Korean Traditional Soy Paste(Doenjang)

메주 제조 시 Bacillus subtilis의 첨가가 재래식 된장의 발효에 미치는 영향

  • Rhee, Chang-Ho (Deptartment of Food Science and Technology, Kyungpook National University) ;
  • Kim, Won-Chan (Deptartmrnt of Agricultural Chemistry, Kyungpook National University) ;
  • Rhee, In-Koo (Deptartmrnt of Agricultural Chemistry, Kyungpook National University) ;
  • Park, Heui-Dong (Deptartment of Food Science and Technology, Kyungpook National University)
  • Published : 2008.08.30
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Abstract

Korean traditional soy paste(Doenjang) was fermented for 90 days using, as a starter, a Meju prepared by inoculation of Bacillus subtilis cells. Changes in physiochemical and functional properties were investigated during fermentation. Amylase and protease activities increased and showed maximal levels(4.11 and 7.75 units/mL, respectively) after 60 days of fermentation. Both enzyme activities then fell. Inhibitory activities of the soy paste against tyrosinase and angiotensin converting enzyme(ACE) increased during the fermentation period. Antimutagenic activities during fermentation were determined using the S. enterica serovar Typhimurium TA100 and TA98 analysis system. No significant differences in activity were observed in soy pastes prepared with or without B. subtilis. Antimutagenic activities against the activities of N-methyl-N'-nitro-N-nitrosoguanidine(MNNG) and 4-nitro-O-phenylenediamine (NPD) increased and reached 70.33% and 60.22%, respectively, after 90 days of fermentation, as assessed using the tester strain TA100. Against the actions of NPD and 4-nitroquinoline-1-oxide(NQO), antimutagenic activities also increased during fermentation and reached 50.84% and 47.01%, respectively, as assessed using the tester strain TA98. The genistin content was much higher(187.48 g/g) in soy paste prepared using B. subtilis inoculation than the level(31.30 g/g) seen in soy paste prepared without bacterial inoculation, although the contents of daidzein and genistein were slightly reduced under such circumstances.

Bacillus subtilis를 메주 제조 시 starter로 접종하여 발효시킨 메주를 이용하여 된장을 담근 후 일정기간 숙성시킨 다음 된장의 이화학적 성질 등의 변화를 측정하였다. Amylase와 protease의 활성은 숙성 60일 후 4.11 unit/mL와 7.75 unit/mL로 가장 높게 나타났으며 숙성이 더욱 진행됨에 따라 감소하는 경향을 나타내었다. Tyrosinase의 저해활성과 ACE 저해 활성은 숙성기간이 경과함에 따라 증가하는 경향을 나타내었다. 항 돌연변이 활성은 숙성기간이 길어질수록 증가하는 경향을 나타내었으며, Salmonella enterica serovar Typhimurium TA100에 대하여 변이원 MNNG와 NPD에 대한 항 돌연변이 활성은 70.33%와 60.22%로 나타났으며, TA98에 대하여 변이원 NPD와 NQO에 대한 항 돌연변이 활성은 50.84와 47.01%를 나타내었다. 90일간 발효 숙성시킨 된장의 isoflavon의 함량은 genistin의 경우 Bacillus subtilis를 첨가하여 제조한 경우가 187.48 ${\mu}g/g$으로 높게 나타났다. Daidzein과 genistein은 전통적으로 제조한 메주를 이용한 된장에서 각각 574.88 ${\mu}g/g$과 532.92 ${\mu}g/g$으로 가장 높게 나타났다.

Keywords

References

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