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http://dx.doi.org/10.9721/KJFST.2012.44.2.216

Physicochemical Properties of Dextran Produced by Leuconostoc mesenteroides SM according to Concentration of Yeast Extract and its Modulation of Rheological Properties  

Kim, Ji-Eun (Department of Food Science and Technology, Keimyung University)
Whang, Key (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.44, no.2, 2012 , pp. 216-223 More about this Journal
Abstract
Dextran was produced by $Leuconostoc$ $mesenteroides$ SM with various contents of yeast extract and its rheological properties were modulated, via an addition of hydroxypropyl methylcellulose (HPMC) of different viscosities. The conversion yield reached 90% after adding 3% yeast extract, which remained constant, thereafter. The acidity of the cultures was approximately 1.4 and 0.9% after fermentation for 24 h at 25 and $30^{\circ}C$, respectively. The total dextran content (107.3 g/kg) was the highest in the presence of the 3% yeast extract. Under the same conditions, the consistency, viscous modulus (G"), and elastic modulus (G') of the cultures were $37.6\;Pa{\cdot}s^n$, 38 Pa, and 50 Pa, respectively. The rheological properties of the culture were changed drastically by the fortification with HPMC of higher concentration and viscosity. The addition of 10% HPMC (4,000 cp) resulted in a significant increase in G" to 1,950 Pa. Furthermore, adding HPMC to a viscous culture resulted in a remarkable increase in both hardness and firmness.
Keywords
yeast extract; dextran; viscoelastic; Leuconostoc mesenteroides; HPMC;
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Times Cited By KSCI : 5  (Citation Analysis)
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