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Characteristics of Rice Doenjang Prepared with Brown Rice Koji
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  • Journal title : Korean Journal of Food Preservation
  • Volume 18, Issue 6,  2011, pp.859-868
  • Publisher : The Korean Society of Food Preservation
  • DOI : 10.11002/kjfp.2011.18.6.859
 Title & Authors
Characteristics of Rice Doenjang Prepared with Brown Rice Koji
Lee, Seung-Eun; Suh, Hyung-Joo; Hwang, Jong-Hyun;
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 Abstract
This study was conducted to determine the appropriate mixing ratio of Koji and rice Doenjang. Brown rice Doenjang (BR) was prepared with three different ratios of cooked soybean to brown rice Koji [1.5:1 (BR-1); 2:1 (BR-2); and 3:1 (BR-3)], and polished-rice Doenjang (PR) was prepared with cooked soybean and polished-rice Koji (2:1). The components related to the quality of Doenjang were analyzed during 60-day aging. No significant differences were found in the moisture and salt contents between the brown rice Doenjang and the polished-rice Doenjang. The pH, titratable acidity, and bacteria cells increased at 20-30 days aging time, and decreased thereafter. The reducing-sugar and ethyl alcohol contents, on the other hand, increased at 10-20 days previously. These analytical values of the physicochemical and microbiological characteristics increased with the increase in the percentage of koji in each Doenjang. The amino-nitrogen and free-amino-acid contents showed the highest levels in BR-1: 887.6 and mg%, respectively. The -aminobutyric-acid (GABA) contents slightly increased with increasing aging time. In the color of Doenjang, the lightness and yellowness increased along with the aging time, but the redness decreased as the aging time increased. These results showed that BR-1 processed the fermentation the fastest compared with the others. Moreover, the reducing-sugar, ethanol, and free-amino-acid contents as palatable components increased rapidly until 30 days aging time.
 Keywords
brown rice;Koji;rice Doenjang;aging;
 Language
Korean
 Cited by
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Effect of Low Frequency (20-35 kHz) Airborne Ultrasonication on Microbiological and Physicochemical Properties of Soybean Koji,;;;

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Effect of low frequency (20–35 kHz) airborne ultrasonication on microbiological and physicochemical properties of soybean Koji, Food Science and Biotechnology, 2015, 24, 3, 1035  crossref(new windwow)
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