Solid-state fermentation-supported enhanced production of [alpha]-galactosidase by a deoxyglucose-resistant mutant of Aspergillus niger and thermostabilization of the production process

The aim of the present investigation was to comparatively evaluate the behaviour of A. niger and its derepressed mutant in production of a-galactosidase in submerged (SmF) and solid state fermentation (SSF) using basal Vogel's medium or corn steep liquor as nitrogen source and observe the respo...

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Bibliographic Details
Published in:World journal of microbiology & biotechnology 2009-02, Vol.25 (2), p.171-178
Main Authors: Rajoka, Muhammad Ibrahim, Awan, Muhammad Siddique, Saleem, Mahjabeen, Ayub, Najma
Format: Article
Language:English
Subjects:
Ammonium
Ammonium salts
Aspergillus niger
Biotechnology
Corn
Enzymes
Fermentation
Glucose
Humidity
Inactivation
Lactose
Liquor
Moisture content
Nitrogen
Nitrogen sources
Organisms
Processes
Studies
Yeast
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Summary:The aim of the present investigation was to comparatively evaluate the behaviour of A. niger and its derepressed mutant in production of a-galactosidase in submerged (SmF) and solid state fermentation (SSF) using basal Vogel's medium or corn steep liquor as nitrogen source and observe the response of latter source under both cultural techniques under different temperature regimes, and determine if SSF can be exploited in a wide range of temperature expected to vary in this fermentation system. All studies were performed in both systems under pre-optimized cultural conditions. Higher melting temperature and negative values of entropy of activation in SSF indicated that the genetic system of both organisms was thermodynamically resistant in the presence of corn steep liquor but sensitive to inactivation in the presence of Vogel's nitrogen sources in submerged fermentation. This was reflected as the organisms demanded higher magnitudes of energy for product formation in the presence of ammonium salts. Studies on influence of corn steep liquor revealed that it had stabilizing effect too in both fermentation systems but the mutant strain was more stable in both fermentation systems. Because of these properties, the mutant organism may be exploited for bulk production of a-galactosidase in SSF under condition where temperature may fluctuate during fermentation.
ISSN:0959-3993
1573-0972
DOI:10.1007/s11274-008-9886-0