Food Science and Preservation (한국식품저장유통학회지)

The Korean Society of Food Preservation (한국식품저장유통학회)
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Bioactive compounds of Cheonggukjang prepared by different soybean cultivars with Bacillus subtilis HJ18-9

Bacillus subtilis HJ18-9 이용하여 제조한 품종별 청국장의 품질특성과 isoflavone 함량의 변화

  • 송진 (농촌진흥청 국립농업과학원) ;
  • 이경하 (농촌진흥청 국립농업과학원) ;
  • 최혜선 (농촌진흥청 국립농업과학원) ;
  • 황경아 (농촌진흥청 국립농업과학원)
  • Received : 2015.06.17
  • Accepted : 2015.07.21
  • Published : 2015.08.30
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Abstract

This study was conducted to investigate the changes of isoflavone composition (glycoside and bio-active aglycone) in Cheonggukjang and to evaluate its quality characteristics depending on different soybean cultivars (Daewon, Daepoong, Wooram, Hwangkeumol and Saedanback). The bioactivity of Cheonggukjang was enhanced during fermentation at $37^{\circ}C$ for 48 h. Activities of ${\alpha}$-amylase, protease, and cellulase increased significantly after 48 h fermentation (p<0.05). In addition, amino-type nitrogen and reducing sugar contents in Cheonggukjang fermented with B. subtilis increased significantly after 48 h fermentation (p<0.05). Among the isoflavones, the content of $\beta$-glucosides and acetyl-glucosides decreased, while aglycone content increased during fermentation. Especially, Cheonggukjang fermented with Daepoong cultivars showed the greatest increase in daidzein, genistein and glycitein contents. After 48 h fermentation, the contents of daidzein, genistein and glycitein in the Cheonggukjang fermented with Daepoong cultivars increased significantly up to $503.65{\pm}2.76$, $111.40{\pm}0.42$, and $633.95{\pm}6.01{\mu}g/g$ (p<0.05), respectively. Total aerobic and anaerobic cell counts increased with increase in fermentation time. Therefore, it would be beneficial for the food industry if components of Cheonggukjang could be separated and used to develop functional products.

본 연구에서는 $\beta$-glucosidase활성이 있는 B. subtilis HJ18-9균을 접종하여 품종별로 청국장을 제조하여, 품종별 청국장의 품질특성과 isoflavone 함량 변화를 측정한 결과이다. 청국장의 단백질 분해 특유의 구수한 맛 성분을 유리하는 효소인 protease활성은 발효 전에는 새단백 청국장이 가장 높은 활성을 나타냈으며, 발효 후에는 우람 청국장이 가장 높은 protease활성을 나타냈다. 이는 구수한 맛 성분의 지표성분인 아미노태 질소함량과 같은 경향을 나타냈다. 환원당을 유리하는데 관여하는 a-amylase 활성은 새단백으로 제조한 청국장이 다른 품종에 비해 유의적으로 높은 함량을 나타냈으며 다섯가지 품종 모두 발효 후에 증가하는 경향을 나타냈다. 발효 후에 총 균수가 높아지는 경향을 나타냈으며 발효 초에는 우람 청국장이 유의적으로 높은 균수를 나타냈으나, 발효 후에는 품종 간에 유의적인 차이는 나타내지 않았다. 품종별 청국장의 isoflavone 함량은 발효초기에는 대풍, 우람 품종으로 제조한 청국장의 aglycone함량이 가장 높았으며, 48시간 발효 후에도 두 가지 품종이 각각 $1249.04{\pm}9.14ug/g$, $589.32{\pm}14.08ug/g$로 가장 높은 aglycone 전환율 나타냈다. 이는 발효 초 aglycone함량에 비해 5.31, 1.94배 증가시켰다.

Keywords

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