Kinetics investigation of cell growth, xanthan production and sugar cane molasses consumption by Xanthomonas campestris

Document Type: Full article


1 Materials and Energy Center

2 Material and energy research center

3 Chemical and Petroleum Engineering Department, Sharif University of Technology


In this research, unstructured kinetic modeling for cell growth evaluation by X.campestris, xanthan production and sugar cane molasses consumption in a batch culture were investigated. Logistic model for biomass growth, Luedeking-Piret model for xanthan biopolymer production and modified Luedeking-Piret model for sugar cane molasses consumption provides an accurate prediction of the fermentation kinetics parameters with high coefficient of determination R2 values.Luedeking-Piret model for xanthan biopolymer production in three different concentration of sugar cane molasses (30, 60 and 90 g/l) as the sole carbon source substrate were studied. A good agreement between experimental and predicted values indicated that the unstructured models were able to describe this fermentation process successfully. The values of specific growth rate μ_max of logestic model for sugar cane molasses (30, 60 and 90 g/l) were 0.029, 0.031 and 0.032 h-1 respectively. The values of α and β is 5.280, 6.594, 8.518 and 0.072, 0.066, 0.086 respectively which shows that the xanthan production is growth associated since the value of the growth associated parameter α is much more than the value of nongrowth associated parameter β in Luedeking Piret model. Moreover, the values of γ and 𝜂 in modified Luedeking-Piret model were obtained.


Main Subjects

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