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Characteristics of Bacterial-Koji and Doenjang(soybean paste) Made by using Bacillus subtilis DJI  

Chang, Mi (Department of Food and Nutrition, Chosun University)
Chang, Rae-Choon (Department of Food and Nutrition, Chosun University)
Publication Information
Microbiology and Biotechnology Letters / v.35, no.4, 2007 , pp. 325-333 More about this Journal
Abstract
One bacterium with high proteinase production and spore-forming ability was isolated from korean traditional soybean paste(doenjang). The isolated strain was identified as Bacillus subtilis, based on gram-staining, biochemical properties and l6S rRNA gene sequencing, and designated as B. subtilis DJI. Its growth rate was very fast, and it reached its stationary phase within 9 h, and then started to form spores. Bacterial-koji and doenjang were prepared using B. subtilis DJI. Chemical components of the doenjang were determined after 2 months of aging period: amino nitrogen 507 mg%, crude protein 14.3%, crude fat 4.8% and water 54.9%. The composition of total and free amino acids and their ratios of doenjang were changed during the aging period. Among total amino acids in DJI doenjang, glutamic acid, aspartic acid, leucine and arginine were the major amino acids. The fibrinolytic activities of DJI doenjang and traditional doenjangs were 909.7 units/ml and $363.3{\sim}618.6\;units/ml$, respectively. Flavor compounds of DJI doenjang and traditional doenjang were extracted by SDE(simultaneous steam distillation and extraction), and analyzed by GC/MS; DJI doenjang possessed the typically favorable flavor compounds in traditional korean doenjang, with reduced off-flavor compounds.
Keywords
B. subtilis DJI; bacterial-koji; doenjang; soybean paste; fibrinolytic activity;
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