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Discrimination between ethanol inhibition models in a continuous alcoholic fermentation process using flocculating yeast

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Abstract

Discrimination between different rival models for describing the inhibitory effect of ethanol both on yeast growth and on fermentation was studied for a continuous process of alcoholic fermentation in a tower reactor with recycling of flocculating cells. Models tested include linear, parabolic, hyperbolic, exponential, and generalized nonlinear power-law types. The best expressions were identified under the criteria that all the kinetic parameters should assume acceptable values in a feasible range and should result in the best fit of the experimental data. The kinetic parameters were estimated from steady-state data of several sugar concentrations in feeding stream (S0 = 160, 170, 180, 190, 200 g/L), constant dilution rate (D = 0.2 h-1), recycle ratio (α = 13.6), and temperature (T = 30°C). The best model for the yeast growth was of power-law type, whereas for the product formation the best model was of linear type. These models were able to reproduce the trends of the process variables satisfactorily.

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Correspondence to Samuel C. Oliveira.

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Oliveira, S.C., Paiva, T.C.B., Visconti, A.E.S. et al. Discrimination between ethanol inhibition models in a continuous alcoholic fermentation process using flocculating yeast. Appl Biochem Biotechnol 74, 161–172 (1998). https://doi.org/10.1007/BF02825963

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  • DOI: https://doi.org/10.1007/BF02825963

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