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KMID : 0380619900220050533
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Korean Journal of Food Science and Technology
1990 Volume.22 No. 5 p.533 ~ p.538
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Effects of Aeration Rates and Rheological Properties of Fermentation Broth on Pullulan Fermentation
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Abstract
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In polysaccharide fermentation with Aoreolxrsidirrm pullnlrrns, the aeration effects on the production of polysaccharide and the Theological properties of fermentation broth were studied. The increase of the aeration rates from 0.5 to 2.0 vvm at 500 rpm yielded the maximum specific production rate of polysaccharide from 0.046 to 0.093 (hr^(-l)), and the maximum specific growth rate of cells from 0.168 to 0.192 (hr^(-l)). The viscosity behavior of fermentation broths at the different aeration rates followed the power-law, γ= K(Υ)^n. The viscosity attributed by cells was about 10% of the total viscosity of fermentation broth and most of viscosity was attributed by the polysaccharide produced. The relationship between power-law parameters and the concentration of polysaccharide generally satisfied the equations with the regression coefficient greater than 0.980, 1nK(t)= ln(γ)_o n(t) In(Υ)_o and K(t) = A P(t)^B.
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