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Biological systems are very complex regarding their kinetic behavior. There are many models that intend to predict fermentation performance, although Monod equation remains the best model. A detailed investigation of batch fermentation process at room temperature for two different types of yeast Saccharomyces carlsbegensis and Saccharomyces cerevisiae was carried out. Batch fermentation experiments were carried in 1 liter bioreactors, in the same medium, time and fermentation conditions. Kinetic constants were used to compare fermentation performance under similar conditions. Kinetic parameters investigation was done based on growth kinetics, ethanol productivity and substrate consumption (glucose) using computer simulation for different kinetic models. There are some notable differences based on kinetic models. Although two types of yeast strain leave the same remain extract in the end of fermentation, fermentation dynamics differ from each other. Saccharomyces carlsbengensis has higher ( max and Ks ) kinetic constants compared to Saccharomyces cerevisiae. For both fermentations the best predicting model was Monod, better results give saccharomyces carsbegensis curve.

A Comparative Study of Batch Fermentation Performance of Saccharomyces carlsbengensis and Saccharomyces cerevisiae based on Kinetic Parameters