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Improvement of oxygen transfer coefficient duringPenicillium canescens culture : Influence of turbine design, agitation speed, and air flow rate on xylanase production.
MedLine Citation:
PMID:  18576019     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
To improve xylanase productivity fromPenicillium canescens 10-10c culture, an optimization of oxygen supply is required. Because the strain is sensitive to shear forces, leading to lower xylanase productivity as to morphological alteration, vigorous mixing is not desired. The influence of turbine design, agitation speed, and air flow rate on K(1)a (global mass transfer coefficient, h(-1)) and enzyme production is discussed. K(1)a values increased with agitation speed and air flow rate, whatever the impeller, in our assay conditions. Agitation had more influence on K(1)a values than air flow, when a disk-mounted blade's impeller (DT) is used; an opposite result was obtained with a hub-mounted pitched blade's impeller (PBT). Xylanase production appeared as a function of specific power (W/m(3)), and an optimum was found in 20 and 100 L STRs fitted with DT impellers. On the other hand, the use of a hub-mounted pitched blade impeller (PBT8), instead of a disk-mounted blade impeller (DT4), reduced the lag time of hemicellulase production and increased xylanase productivity 1.3-fold.
Authors:
A Gaspar; L Strodiot; P Thonart
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Applied biochemistry and biotechnology     Volume:  70-72     ISSN:  0273-2289     ISO Abbreviation:  Appl. Biochem. Biotechnol.     Publication Date:  1998  
Date Detail:
Created Date:  2008-06-25     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8208561     Medline TA:  Appl Biochem Biotechnol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  535-45     Citation Subset:  -    
Affiliation:
Centre Wallon de Biologie Industrielle, Faculté universitaire des sciences agronomiques de Gembloux, 2, Passage Des Déportés, B-5030, Belgium, bioindus@fsagx.ac.be.
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