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Title 

Enhancement of glucose oxidase production in batch cultivation of recombinant Saccharomyces cerevisiae: optimization of oxygen transfer condition

Authors 

Arnab KapatJun Kee JungYoung Hoon Park

Publisher 

Wiley-Blackwell

Issue Date 

2001

Citation 

Journal of Applied Microbiology, vol. 90, no. 2, pp. 216-222

Keywords 

dissolved oxygenglucose oxidaseoxygen transportsaccharomyces cerevisiaeoxygen

Abstract 

Aims: 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-?-vis oxygen transfer condition and specific glucose oxidase production. Methods and 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 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. Significance and Impact of the Study: 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.

ISSN 

1364-5072

Link 

http://dx.doi.org/10.1046/j.1365-2672.2001.01233.x

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2017-04-19


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