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http://dx.doi.org/10.9721/KJFST.2014.46.2.165

Production of Set-type Yogurt Fortified with Peptides and γ-aminobutyric acid by Mixed Fermentation Using Bacillus subtilis and Lactococcus lactis  

Lim, Jong-Soon (Department of Food Science and Technology, Keimyung University)
Lee, Sam-Pin (Department of Food Science and Technology, Keimyung University)
Publication Information
Korean Journal of Food Science and Technology / v.46, no.2, 2014 , pp. 165-172 More about this Journal
Abstract
Mixed fermentation of cow milk was performed by sequential co-cultures with Bacillus subtilis and Lactococcus lactis. After a first fermentation step with B. subtilis for 6 h, the number of viable cells increased to $2.5{\times}10^8$ CFU/mL. The second fermentation step with L. lactis resulted in increased viable cells $1.09{\times}10^{10}$ CFU/mL for 3 days and increased acidity. However, the number of viable B. subtilis cells was decreased greatly to $5{\times}10^1$ CFU/mL following fermentation with L. lactis. Milk proteins were markedly hydrolyzed by the first fermentation after 2 h, and the second fermentation induced curd formation in milk. However, after 4 h, the first fermentation resulted in higher whey separation and 80 mg% tyrosine content. Gamma-aminobutyric acid (GABA) production was dependent upon the degree of protein hydrolysis by first fermentation. Second fermentation resulted in 0.14% GABA. The milk fermented by B. subtilis indicated the rough surface of yogurt depended upon the degree of protein hydrolysis. In conclusion, set-type yogurt was efficiently produced by co-culturing of milk, and fortifying with peptides, GABA, and probiotics.
Keywords
set-type yogurt; peptide; ${\gamma}$-aminobutyric acid; Bacillus subtilis; Lactococcus lactis;
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Times Cited By KSCI : 9  (Citation Analysis)
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