Document Detail


Fed-batch cultivation of Saccharomyces cerevisiae in a hyperbaric bioreactor.
MedLine Citation:
PMID:  12675615     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Fed-batch is the dominating mode of operation in high-cell-density cultures of Saccharomyces cerevisae in processes such as the production of baker's yeast and recombinant proteins, where the high oxygen demand of these cultures makes its supply an important and difficult task. The aim of this work was to study the use of hyperbaric air for oxygen mass transfer improvement on S. cerevisiae fed-batch cultivation. The effects of increased air pressure up to 1.5 MPa on cell behavior were investigated. The effects of oxygen and carbon dioxide were dissociated from the effects of total pressure by the use of pure oxygen and gas mixtures enriched with CO(2). Fed-batch experiments were performed in a stirred tank reactor with a 600 mL stainless steel vessel. An exponential feeding profile at dilution rates up to 0.1 h(-)(1) was used in order to ensure a subcritical flux of substrate and, consequently, to prevent ethanol formation due to glucose excess. The ethanol production observed at atmospheric pressure was reduced by the bioreactor pressurization up to 1.0 MPa. The maximum biomass yield, 0.5 g g(-)(1) (cell mass produced per mass of glucose consumed) was attained whenever pressure was increased gradually through time. This demonstrates the adaptive behavior of the cells to the hyperbaric conditions. This work proved that hyperbaric air up to 1.0 MPa (0.2 MPa of oxygen partial pressure) could be applied to S. cerevisiae cultivation under low glucose flux. Above that critical oxygen partial pressure value, i.e., for oxygen pressures of 0.32 and 0.5 MPa, a drastic cell growth inhibition and viability loss were observed. The increase of carbon dioxide partial pressure in the gas mixture up to 48 kPa slightly decreased the overall cell mass yield but had negligible effects on cell viability.
Authors:
I Belo; R Pinheiro; M Mota
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Publication Detail:
Type:  Evaluation Studies; Journal Article    
Journal Detail:
Title:  Biotechnology progress     Volume:  19     ISSN:  8756-7938     ISO Abbreviation:  Biotechnol. Prog.     Publication Date:    2003 Mar-Apr
Date Detail:
Created Date:  2003-04-04     Completed Date:  2004-03-15     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  8506292     Medline TA:  Biotechnol Prog     Country:  United States    
Other Details:
Languages:  eng     Pagination:  665-71     Citation Subset:  IM    
Affiliation:
Centro de Engenharia Biológica-IBQF, Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal.
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MeSH Terms
Descriptor/Qualifier:
Adaptation, Physiological / physiology
Air Pressure
Bioreactors / microbiology*
Carbon Dioxide / metabolism*
Cell Culture Techniques / methods*
Cell Division / physiology
Cell Survival / physiology
Ethanol / metabolism*
Glucose / metabolism
Oxygen / metabolism*
Oxygen Consumption / physiology
Saccharomyces cerevisiae / cytology,  growth & development*,  metabolism*
Chemical
Reg. No./Substance:
124-38-9/Carbon Dioxide; 50-99-7/Glucose; 64-17-5/Ethanol; 7782-44-7/Oxygen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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