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http://dx.doi.org/10.5352/JLS.2008.18.10.1377

Process Optimization of Dextran Production by Leuconostoc sp. strain YSK. Isolated from Fermented Kimchi  

Hwang, Seung-Kyun (Department of Oriental Medicine and FoodBiotechnology, Joongbu University)
Hong, Jun-Taek (Department of Oriental Medicine and FoodBiotechnology, Joongbu University)
Jung, Kyung-Hwan (Department of Food and Biotechnology, Chungju University)
Chang, Byung-Chul (Department of Medical Genetic Engineering, Keimyung University School of Medicine and Institute for Medical Science)
Hwang, Kyung-Suk (Department of Biotechnology, Mokwon University)
Shin, Jung-Hee (Department of Food and Nutrition, Joongbu University)
Yim, Sung-Paal (Korea Atomic Energy Research Institute)
Yoo, Sun-Kyun (Department of Oriental Medicine and FoodBiotechnology, Joongbu University)
Publication Information
Journal of Life Science / v.18, no.10, 2008 , pp. 1377-1383 More about this Journal
Abstract
A bacterium producing non- or partially digestible dextran was isolated from kimchi broth by enrichment culture technique. The bacterium was identified tentatively as Leuconostoc sp. strain SKY. We established the response surface methodology (Box-Behnken design) to optimize the principle parameters such as culture pH, temperature, and yeast extract concentration for maximizing production of dextran. The ranges of parameters were determined based on prior screening works done at our laboratory and accordingly chosen as 5.5, 6.5, and 7.5 for pH, 25, 30, and $35^{\circ}C$ for temperature, and 1, 5, and 9 g/l yeast extract. Initial concentration of sucrose was 100 g/l. The mineral medium consisted of 3.0 g $KH_2PO_4$, 0.01 g $FeSO_4{\cdot}H_2O$, 0.01 g $MnSO_4{\cdot}4H_2O$, 0.2 g $MgSO_4{\cdot}7H_2O$, 0.01 g NaCl, and 0.05 g $CaCO_3$ per 1 liter deionized water. The optimum values of pH and temperature, and yeast extract concentration were obtained at pH (around 7.0), temperature (27 to $28^{\circ}C$), and yeast extract (6 to 7 g/l). The best dextran yield was 60% (dextran/g sucrose). The best dextran productivity was 0.8 g/h-l.
Keywords
Kimchi; dextran; Box-Benken design; sucrose; yield; productivity;
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