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http://dx.doi.org/10.9799/ksfan.2013.26.2.273

Fermentation Characteristics of Soybean Yogurt by Mixed Culture of Bacillus sp. and Lactic Acid Bacteria  

Yang, Ming (Dept. of Food Science and Nutrition, Dong-A University)
Kwak, Jung Soon (Dept. of Food Science and Nutrition, Dong-A University)
Jang, Seri (Dept. of Food Science and Nutrition, Dong-A University)
Jia, Yuan (Dept. of Food Science and Nutrition, Dong-A University)
Park, Inshik (Dept. of Food Science and Nutrition, Dong-A University)
Publication Information
The Korean Journal of Food And Nutrition / v.26, no.2, 2013 , pp. 273-279 More about this Journal
Abstract
The microorganisms producing high protease activity and acid producing ability were isolated from Chunggukjang and kimchi, which were identified as Bacillus subtilis and Lactobacillus planetarum by morphological, biochemical and nutrient requirement. The attempt was made to produce soybean milk yoghurt by using the isolated microorganisms. The mixed culture of Bacillus subtilis and Lactobacillus plantarum exhibited the lowest pH value of 4.23 and highest titratable acidity of 0.88% compared to those of single cultures at $37^{\circ}C$ for 32 hrs, and their total viable count was $4.09{\times}10^8$ $cfu/m{\ell}$. The ${\alpha}$-amylase activity was the highest in culture of Bacillus subtilis after incubation for 24 hrs, while protease activity was most produced in mixed culture of Bacillus subtilis and Lactobacillus plantarum. The amounts of reducing sugars were steadily decreased as soy milk fermentation progressed.
Keywords
soybean milk yogurt; Bacillus subtilis; Lactobacillus plantarum; mixed culture;
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Times Cited By KSCI : 2  (Citation Analysis)
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