Abstract
Growth, enzyme-producing activity and respiratory properties of Trichoderma reesei QM 9414 were examined under various agitation intensities. Two substrates were compared: lactose and Avicel. Pellet formation occurred at all agitation intensities for both substrates. Oxygen dependence at the lower agitation rate varied with the substrate type. With lactose as the carbon source, linear growth was observed, despite a regulation of the dissolved oxygen concentration at 30% saturation. The enzyme production was strongly affected by the agitation. At the higher agitation rates the enzyme production dropped. With Avicel as the carbon source, the production of enzymes surged as soon as the growth was limited by the hydrolysis of Avicel.
Growth on Avicel, in the conditions we used, was limited by Avicel hydrolysis. Cubic growth was observed when lactose was the carbon source. A new derivation for a model of the observed cubic growth is proposed and is used to correlate growth, CO2 production and oxygen consumption in a consistent way, impossible with exponential growth models.
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Lejeune, R., Baron, G.V. Effect of agitation on growth and enzyme production of Trichoderma reesei in batch fermentation. Appl Microbiol Biotechnol 43, 249–258 (1995). https://doi.org/10.1007/BF00172820
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DOI: https://doi.org/10.1007/BF00172820