Suppression of Solid Matters Precipitation of Takju and Its Quality Improvement by Carrageenan

This study was conducted to examine the possibility of improvement effect in suppression of precipitation and nasty smell creation in Takju mash. First of all, gum shown to be lowest precipitation velocity was selected and this was applied to the fermentation of Takju mash for comparing with the control in terms of fermentation aspects and various qualities of Takju mash. Precipitation amount and precipitation velocity of suspension in Takju mash added with carrageenan was shown to be the lowest than that of others. Compared with the control, alcohol was highly generated in Takju mash added with carrageenan, especially between two and four days. Total acidity was shown to be highly increased until 2 days in Takju mash and thereafter to be slightly increased. Takju mash added with carrageenan was shown to be lower on the second stage than the control. Fusel oil produced from mash added with carrageenan was 0.046${\sim}$0.113${\mu}$l/ml and mash added with carrageenan generated less fusel oil than the control by 1.6${\sim}$3.2 fold. Yeast growth on the mash added with carrageenan was revealed to be helpful during fermentation periods. In general, sensory characteristics of Takju mash were shown to be more superior in mash added with carrageenan than in other samples. While nasty smell produced from a sample without gums was perceived after 2 days of Takju mash storage, nasty smell of Takju mash added with carrageenan was recognized after 6 days during storage. In conclusion, precipitation of suspension and nasty smell production in Takju mash were found to be suppressed by addition of carrageenan during Takju fermentation.

Carrageenan에 의한 탁주 고형물 침전 억제 및 품질 개선에 관한 연구

본 연구는 탁주의 침전과 이취 발생 억제 등 품질개선을 위해 실시하였는데 고형물의 침전 속도가 가장 낮은 검류를 선택하여 이를 탁주 발효에 적용, 대조구와의 발효 양상 및 탁주의 품질을 서로 비교하였다. 우선 실험에 사용한 검류 중 carrageenan이 가장 좋은 효과를 나타내었는데 침전량이 가장 적고 침전 속도도 가장 느린 것으로 나타났다. 알코올 생성에 대해서는 carrageenan의 경우가 대조구보다 좋은 발효 양상을 보였으며 2${\sim}$4일 사이에 왕성하게 일어났다. 탁주의 산도는 2일째까지 산도가 많이 증가하고 그 이후에는 적게 증가하였으며 carrageenan의 경우 대조구보다 산도가 낮게 나타났다. 알코올 발효 과정의 fusel oil의 생성이 관해서는 carrageenan을 첨가한 경우(0.046${\sim}$0.113${\mu}$l/ml의 범위) 대조구보다 1.6배${\sim}$3.2배 낮게 나타났다. 효모 생육은 carrageenan을 첨가한 경우 효모 증식에 도움이 되는 것으로 나타났다. 탁주의 관능 평가에서는 carrageenan을 첨가한 것이 대조구보다 우수한 것으로 나타났다. 탁주의 저장 중 발생하는 이취(nasty smell)는 대조구는 저장 2일째부터, carrageenan을 첨가한 경우는 6일째부터 이취가 감지되었다. 결론적으로 탁주의 저장 중 침전과 이취의 발생 억제는 carrageenan을 첨가하므로 해결할 수 있을 것으로 생각되었다.