title: Enhancement of glucose oxidase production in batch cultivation of recombinant Saccharomyces cerevisiae: optimization of oxygen transfer condition.
abstract: OBJECTIVE
  To obtain an optimal combination of agitation speed and aeration rate for maximization of specific glucose oxidase (GOD) production in recombinant Saccharomyces cerevisiae, and to establish a correlation between kLa vis-à-vis oxygen transfer condition and specific glucose oxidase production.
  
  
  RESULTS
  The oxygen transfer condition was manifested indirectly by manipulating the impeller speed and aeration rate in accordance with a Central Composite Rotatory Design (CCRD). The dissolved oxygen concentration and the volumetric oxygen transfer coefficient (kLa) were determined at corresponding combinations of impeller speed and aeration rate. The maximal specific extracellular glucose oxidase production (3.17 U mg-1 dry cell mass) was achieved when the initial dissolved oxygen concentration was 6.83 mg l-1 at the impeller speed of 420 rev min-1 and at the rate of aeration of 0.25 vvm. It was found out that while impeller speed had a direct effect on the production of enzyme, a correlation between kLa and specific GOD production could not be established.
  
  
  CONCLUSIONS
  At the agitation speed of 420 rev min-1 and at 0.25 vvm aeration rate, the degree of turbulence and the dissolved oxygen concentration were thought to be optimal both for cellular growth and production of enzyme.
  
  
  CONCLUSIONS
  The combined effect of agitation and aeration on recombinant glucose oxidase production in batch cultivation has not yet been reported in the literature. Therefore, this study gives an insight into the effect of these two important physical parameters on recombinant protein production. It also suggests that since there is no correlation between kLa and specific production of GOD, kLa should not be used as one of the scale-up parameters.
authors.affiliation: Biopilot Plant, Korea Research Institute of Bioscience and Biotechnology, KIST, P.O. Box 115, Yusong, Taejon 305-600, Republic of Korea. Arnab.Kapat@cc.chiron.com
authors.forename: A
authors.initials: A
authors.lastname: Kapat
authors.forename: J K
authors.initials: JK
authors.lastname: Jung
authors.forename: Y H
authors.initials: YH
authors.lastname: Park
mesh_terms: D019149:Bioreactors; D003470:Culture Media; D005949:Glucose Oxidase / Q000235:genetics / Q000378:metabolism*; D010100:Oxygen / Q000494:pharmacology; D011995:Recombination, Genetic; D012441:Saccharomyces cerevisiae / Q000201:enzymology* / Q000235:genetics / Q000254:growth & development*
chemical_list: D003470:Culture Media; D005949:Glucose Oxidase; D010100:Oxygen