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http://dx.doi.org/10.11002/kjfp.2017.24.5.714

Soju brewing characteristics of yeast strains N4 and N9 isolated from Korean traditional Nuruk  

Choi, Han-Seok (Fermented Food Science Division, National Institute of Agricultural Sciences, RDA)
Kang, Ji-Eun (Fermented Food Science Division, National Institute of Agricultural Sciences, RDA)
Jeong, Seok-Tae (Fermented Food Science Division, National Institute of Agricultural Sciences, RDA)
Kim, Chan-Woo (Fermented Food Science Division, National Institute of Agricultural Sciences, RDA)
Baek, Seong-Yeol (Fermented Food Science Division, National Institute of Agricultural Sciences, RDA)
Yeo, Soo-Hwan (Fermented Food Science Division, National Institute of Agricultural Sciences, RDA)
Publication Information
Food Science and Preservation / v.24, no.5, 2017 , pp. 714-724 More about this Journal
Abstract
Soju is a Korean traditional distilled alcoholic beverage produced from mashes various crops and Nuruk which is cultured with wild microorganisms. This study was conducted to investigate rice-Soju brewing characteristics of yeasts isolated from Korean traditional Nuruk. The general components of rice (Hanarumbyeo) raw materials were 14.7 g of water, 6.8 g of crude protein, 0.9 g of crude lipid, 0.4 g of crude ash, and 76.5 g of carbohydrate in 100 g. Saccharifying and proteolytic activities in Hanarumbyeo ipguk (solid-state culture of Aspergillus luchuensis) were also determined. The alcohol content of the fermented wash from isolates was 15.37-16.58% (v/v), which is 16.7-36.0% higher than that of industrial yeasts (12.33-13.19%). Reducing sugar contents were 2.04-3.92 and 7.92-8.78 g/100 mL in the isolates and industrial yeasts, respectively. The isolated yeasts showed 25.2-52.7% higher yield of distillates (41% alcohol) compared to industrial yeasts. Forty-one components were detected in the rice distillated Soju (25% alcohol) and principal component analysis revealed differences between the isolated and industrial yeasts with respect to the contents of i-BuOH, isobutanal diethyl acetal, ethyl caprate, and tetradecanoic acid.
Keywords
Nuruk; Soju; Saccharomyces cerevisiae N4; Saccharomyces cerevisiae N9; brewing characteristics;
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Times Cited By KSCI : 12  (Citation Analysis)
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