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http://dx.doi.org/10.9721/KJFST.2012.44.6.728

Quality Characteristics and Antioxidant Effects during Makgeolli Fermentation by Purple Sweet Potato-rice Nuruk  

Cho, Hyeon Kook (Farming Corporation OrumJooga Winery)
Lee, Ju Young (Farming Corporation OrumJooga Winery)
Seo, Weon Taek (Department of Food Science, Gyeongnam National University of Science and Technology)
Kim, Myung Kyu (Department of Mechanicla Engineering, Gyeonam National University of Science and Technology)
Cho, Kye Man (Department of Food Science, Gyeongnam National University of Science and Technology)
Publication Information
Korean Journal of Food Science and Technology / v.44, no.6, 2012 , pp. 728-735 More about this Journal
Abstract
Makgeolli is the oldest Korean traditional wine made from rice, and contains 6-8% alcohol. Also, nuruk is traditionally prepared by exposing moistened ground wheat or rice to the air, and there contained airborne microorganism. In this study, purple sweet potato (PSP) was used as a raw material in the rice nuruk- and makgeolli-making processes. PSP rice nuruk (RN) was made with rice and 0-10% (w/w) PSP, and the characteristics of makgeolli were studied during fermentation. The pH during fermentation decreased from 4.27 (0% PSP-RN), 4.59 (2.5%), 4.50 (5.0%), 4.46 (7.5%), and 4.43 (10.0%) of initial fermentation day to 4.12, 3.82, 3.67, 3.71, and 3.66, respectively, at day 7. The sugar contents increased from $0.4^{\circ}Bx$ of the initial day to $8.0-8.4^{\circ}Bx$, and the levels of alcohol increased to 13.0% (0% PSP-RN), 13.2% (2.5%), 12.8% (5.0, 7.5, and 10.0%) by day 7, respectively. In addition, the contents of soluble anthocyanins and phenolics increased from 0.001-0.121 and 0.2-0.27 g/L on the initial fermentation day to 0.002-0.166 and 1.65-1.87 g/L, corresponding to increases in levels of antioxidant activities of 20-50%, respectively.
Keywords
makgeolli; nuruk; alcohol fermentation; purple sweet potato; antioxidant activity;
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Times Cited By KSCI : 17  (Citation Analysis)
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