Reference : Investigation of the effect of different extracellular factors on the lipase producti...
Scientific journals : Article
Life sciences : Biochemistry, biophysics & molecular biology
http://hdl.handle.net/2268/24246
Investigation of the effect of different extracellular factors on the lipase production by Yarrowia lipolityca on the basis of a scale-down approach
English
Kar, Tambi [Université de Liège - ULg > > > Doct. sc. agro. & ingé. biol.]
Delvigne, Frank mailto [Université de Liège - ULg > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech >]
Masson [ > > ]
Destain, Jacqueline [Université de Liège - ULg > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech >]
Thonart, Philippe mailto [Université de Liège - ULg > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech - Biochimie et microbiologie industrielles >]
10-Sep-2008
JOURNAL OF INDUSTRIAL MICROBIOLOGY & BIOTECHNOLOGY
SPRINGER
35
9
1053-1059
Yes (verified by ORBi)
International
1367-5435
339ZH
D-69121 HEIDELBERG
GERMANY
[en] methyl oleat ; heterogeneities ; scale-up ; LIP2 expression
[en] The influence of three extracellular factors (namely, the methyl oleate dispersion in the broth, the dissolved oxygen variations, and the pH fluctuation) on the lipase production by Y. lipolytica in batch bioreactor has been investigated in different scale-down apparatus. These systems allow to reproduce the hydrodynamic phenomena encountered in large-scale equipments for the three specified factors. The effects of the extracellular factors have been observed at three distinct levels: the microbial growth, the extracellular lipase production, and the induction of the gene LIP2 encoding for the main lipase of Y. lipolytica. Among the set of environmental factors investigated, the dissolved oxygen fluctuations generated in a controlled scale-down reactor (C-SDR) have led to the more pronounced physiological effect by decreasing the LIP2 gene expression level. The other environmental factors observed in a partitioned scale-down reactor, i.e., the methyl oleate dispersion and the pH fluctuations, have led to a less severe stress traduced only by a decrease of the microbial yield and thus of the extracellular lipase specific production rate.
Researchers ; Professionals
http://hdl.handle.net/2268/24246

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