- 무증자 발아흑미를 이용한 막걸리 제조 시 온도가 미치는 영향
- ㆍ 저자명
- 김다래,서보미,노민희,김영완,Kim. Da-Rae,Seo. Bo-Mi,Noh. Min-Hee,Kim. Young-Wan
- ㆍ 간행물명
- KSBB Journal
- ㆍ 권/호정보
- 2012년|27권 4호|pp.251-256 (6 pages)
- ㆍ 발행정보
- 한국생물공학회
- ㆍ 파일정보
- 정기간행물| PDF텍스트
- ㆍ 주제분야
- 기타
In this study we investigated the effect of temperature on the two-stage fermentation of Makgeolli using uncooked germinated black rice. The fermentation processes were conducted at $15^{circ}C$ for three weeks and $25^{circ}C$ for 7 days. The pH of Makgeolli at $25^{circ}C$ increased from pH3.0 to pH 4.2, which was consistent with that at $15^{circ}C$. In contrast total acidity of Makgeolli at $15^{circ}C$ was about half of that at $25^{circ}C$ (0.36% and 0.59%, respectively). By the 7 days-fermentation at $25^{circ}C$, 11% of alcohol was produced, whereas three weeks were required for the same alcohol production at $15^{circ}C$. In the case of sugar contents, the amounts of total glucose-equivalent reducing sugars and glucose increased at the end of the fermentation at $25^{circ}C$ up to 2.25 mg/mL and 3.4 mM, respectively, whereas those at $15^{circ}C$ were maintained at very low levels (0.18 mg/mL and 0.1 mM, respectively). Such limited supplement of sugars at $15^{circ}C$ seemed to affect metabolism of yeast, resulting in different composition of organic acid. At $25^{circ}C$, citric acid that was 73.4 ppm at the initial fermentation was consumed completely, whereas 20 ppm of citiric acid was remained at $15^{circ}C$. In addition, acetic acid and lactic acid in Makgealli at $15^{circ}C$ were 53% and 14% of those at $25^{circ}C$.