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Hydrodynamics, mass transfer and rheological studies of gibberellic acid production in an airlift bioreactor

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Abstract

Although a lot of research has been done into modelling microbial processes, the applicability of these concepts to problems specific for bioreactor design and optimization of process conditions is limited. This is partly due to the tendency to separate the two essential factors of bioreactor modelling, i.e. physical transport processes and microbial kinetics. The deficiencies of these models become especially evident in industrial production processes where O2 supply is likely to become the limiting factor, e.g. production of gibberellic acid and other organic acids. Hydrodynamics, mass transfer and rheology of gibberellic acid production by Gibberella fujikuroi in an airlift bioreactor is presented in this work. Important hydrodynamic parameters such as gas holdup, liquid velocity in the riser and in the downcomer, and mixing time were determined and correlated with superficial gas velocity in the riser. Mass transfer was studied evaluating the volumetric mass transfer coefficient, which was determined as a function of superficial gas velocity in the riser and as a function of fermentation time. Culture medium rheology was studied through fermentation time and allowed to explain the volumetric mass transfer coefficient behaviour. Rheological behaviour was explained in terms of changes in the morphology of the fungus. Finally, rheological studies let us obtain correlations for gas holdup and volumetric mass transfer coefficient estimation using the superficial gas velocity in the riser and the culture medium apparent viscosity.

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Acknowledgements

This work was supported by grants from CONACyT (33973-B), COSNET (648-P) and SAGARPA-CONACYT (200-C01-77).

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Authors and Affiliations

  1. Departamento de Ingeniería Química, Instituto Tecnológico de Celaya, Av. Tecnológico y A. G. Cubas s/n, Celaya, C.P. 38010, Guanajuato, México

    M. C. Chavez-Parga, O. Gonzalez-Ortega, M. L. X. Negrete-Rodriguez, L. Medina-Torres & Eleazar M. Escamilla Silva

  2. Departamento de Alimentos y Biotecnología, Facultad de Química “E” UNAM, México, C.P. 04510, DF, México

    L. Medina-Torres

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  1. M. C. Chavez-Parga
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  2. O. Gonzalez-Ortega
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  3. M. L. X. Negrete-Rodriguez
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  4. L. Medina-Torres
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  5. Eleazar M. Escamilla Silva
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Correspondence to Eleazar M. Escamilla Silva.

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Chavez-Parga, M.C., Gonzalez-Ortega, O., Negrete-Rodriguez, M.L.X. et al. Hydrodynamics, mass transfer and rheological studies of gibberellic acid production in an airlift bioreactor. World J Microbiol Biotechnol 23, 615–623 (2007). https://doi.org/10.1007/s11274-006-9270-x

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  • DOI: https://doi.org/10.1007/s11274-006-9270-x

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