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Optimization of Thickness and Maturation Period of Andong-Soju Nuruk for Fermentation of Andong-Soju  

Bae, Kyung-Hwa (Department of Food and Nutrition, Andong National University)
Ryu, Hee-Young (Department of Food and Nutrition, Andong National University)
Kwun, In-Sook (Department of Food and Nutrition, Andong National University)
Kwon, Chong-Suk (Department of Food and Nutrition, Andong National University)
Sohn, Ho-Yong (Department of Food and Nutrition, Andong National University)
Publication Information
Microbiology and Biotechnology Letters / v.35, no.3, 2007 , pp. 231-237 More about this Journal
Abstract
To support the fermentational superiority of Korean nuruks and maintain the various domestic nuruks, the optimal nuruk production of Andong-Soju, which was designated as an intangible cultural asset of Gyungsangbukdo province from 1987, was investigated. Different thickness of nuruks ($2.2{\sim}5.5\;cm$) were manufactured based on traditional Andong-Soju nuruk method, while the size of round form of nuruk was set to 23 cm. During the 3 weeks maturation, changes of water content, weight, pH, brix, the amount of reducing sugar, sac-charifying activity, viable cell and major microorganisms were determined, Also, ethanol fermentation abilities of the manufactured nuruks were evaluated using 20% glucose medium or 16% starch medium, respectively. Our results indicated that the production of high quality of Andong-Soju nuruk needs $4.0{\sim}5.5\;cm$ thickness and 3 weeks maturation without extraneous yeast addition. These results would be applied to production of homogeneous, and high quality of Andong-Soju nuruk.
Keywords
Andong-Soju nuruk; ethanol fermentation; microbial starter; maturation of nuruk; thickness of nuruk;
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