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http://dx.doi.org/10.11002/kjfp.2013.20.3.379

Establishment of optimal soybean Koji manufacturing conditions  

Kim, Do-Yoon (Department of Food Processing and Distribution, College of Life Sciences, Gangnung-Wonju National University)
Park, Geuk-Yeol (Department of Food Processing and Distribution, College of Life Sciences, Gangnung-Wonju National University)
Jang, Sang-Won (Department of Food Processing and Distribution, College of Life Sciences, Gangnung-Wonju National University)
Hong, Seong-Cheol (Department of Food Processing and Distribution, College of Life Sciences, Gangnung-Wonju National University)
Kwon, Dong-Jin (Department of Food Processing and Distribution, College of Life Sciences, Gangnung-Wonju National University)
Publication Information
Food Science and Preservation / v.20, no.3, 2013 , pp. 379-385 More about this Journal
Abstract
To establish the optimal manufacturing conditions of soybean koji, soybean Koji prepared with Aspergillus oryzae 6-M-1 and Bacillus subtilis 3-B-1 isolated from traditional Korean meju. During 7 days of making Koji, the amount of amino-type nitrogen was getting more increase. The amount of amino-type nitrogen of Koji prepared with A. oryzae 6-M-1 was 686.16 mg% (w/w), that of Koji with B. subtilis 3-B-1 was 643.46 mg% (w/w) at seventh day of making Koji. The ${\alpha}$-amylase activity of Koji prepared with A. oryzae 6-M-1 was 1472.54 unit/g, that of Koji with B. subtilis 3-B-1 was 791.00 units/g on the seventh day of the making. The acidic protease activity of Koji prepared with A. oryzae 6-M-1 was 309.00 unit/g, that of Koji with B. subtilis 3-B-1 was 135.88 unit/g at 7th day of making. The amount of amino-type nitrogen and enzyme activities of soybean Koji prepared with A. oryzae 6-M-1 and B. subtilis 3-B-1 were produced more than those of wheat flour Koji made in factory. Sensory evaluation on a commercial doenjang and doenjangs prepared with A. oryzae 6-M-1 and B. subtilis 3-B-1 was not significantly different at p<0.05.
Keywords
Koji; soybean; doenjang; Aspergillus oryzae; Bacillus subtilis;
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