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http://dx.doi.org/10.9721/KJFST.2012.44.3.312

The Resistance of Bacillus subtilis in Makgeolli to Hydrostatic Pressure  

Lee, Eun-Jung (Division of Convergence Technology, Korea Food Research Institute)
Kim, Joo-Sung (Division of Convergence Technology, Korea Food Research Institute)
Oh, Se-Wook (Department of Foods and Nutrition, Kookmin University)
Kim, Yun-Ji (Division of Convergence Technology, Korea Food Research Institute)
Publication Information
Korean Journal of Food Science and Technology / v.44, no.3, 2012 , pp. 312-316 More about this Journal
Abstract
In order to understand the effect of hydrostatic pressure (HP) on Bacillus subtilis isolated from makgeolli, the survival of B. subtilis after HP treatment (400 MPa for 5 min) in various substrates including phosphate buffer, tryptone soya broth at pH 7 and 4, and makgeolli at pH 4 was evaluated depending on bacterial forms (spores and vegetative cells) and adaptation conditions ($25^{\circ}C$ for 3 h, or $10^{\circ}C$ for 24 h). Spores were generally resistant to HP (<1 log reduction) regardless of conditions. In contrast, vegetative cells were generally susceptible to HP (up to 3 log reduction-except makgeolli) and were more susceptible after 3 h at $25^{\circ}C$ compared to 24 h at $10^{\circ}C$. In vegetative cells inoculated makgeolli (7 log CFU/mL), the colonies were not detected after 24 h at $10^{\circ}C$. Consequently, B. subtilis in makgeolli easily existed as spores and the spores were resistant to HP. Results demonstrate that HP was more promising in the inactivation of vegetative cells.
Keywords
Bacillus subtilis; makgeolli; hydrostatic pressure;
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Times Cited By KSCI : 12  (Citation Analysis)
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