A modified form of logistic equation has been proposed to quantity the batch kinetics of microbial growth during the biosynthesis of extra- and intracellular polymers. Based on the experimental data developed in this study, the proposed model appeared to provide adequate growth and fermentation kinetics of Aureobasidium pullulans. The model was also applicable for representing the reported data on pullulan, xanthan, and poly-beta-hydroxybutyricacid. In comparison to the logistic and Monod kinetics, this model fitted the data better and more accurately described the overall fermentation, both concentrations and fermentation time.
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