녹차 추출물을 함유하는 청국장의 제조

Production of Green Tea Extract-containing Chungkook-jang

본 연구는 녹차추출물을 함유하는 녹차청국장의 제조방법에 관한 것이다. 단백질 분해효소 활성이 높은 균주를 분리 동정하여 Bacillus sp. Bl으로 명명하고 이를 청국장 제조에 사용하였다. Bacillus sp. Bl를 사용하여 청국장을 제조함에 있어서 0.2% 농도의 녹차추출액을 대두중량 대비 1.25%, 2.5%, 5% 첨가하여 청국장을 발효시켰다. 녹차추출액(TS 0.2%)을 1.25% 첨가하여 청국장을 발효시키는 것이 미생물 생육과 관능평가에 있어서 가장 우수한 것으로 나타났다. 휘발성 향기성분 분석에서 청국장 발효에 녹차추출물의 첨가는 불쾌취 발생을 억제하는 데 효과를 보였다.

This study was carried out to establish the manufacturing method of green tea extract-containing chungkook-jang. One strain showed the highest protease activity was isolated, and subsequently identified as Bacillus species. The strain was designated as Bacillus sp. B1, and applied to chungkook-jang fermentation. Green tea extract(TS 0.2%) was added to chungkook-jang fermentation in the quantities of 1.25%, 2.5% and 5%. Results of bacterial growth and sensory evaluation showed that chungkook-jang manufactured from addition of 1.25% quantity of peen tea extract (TS 0.2%) was most acceptable. In investigation of volatile compounds, addition of green tea extract was effective for repression of off-odor from chungkook-jang.