Biomass sorghum as a novel substrate in solid-state fermentation for the production of hemicellulases and cellulases by Aspergillus niger and A. fumigatus.
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2017
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Abstract
Aims: We investigated the role of carbon and nitrogen sources in the
production of cellulase and hemicellulase by Aspergillus strains.
Methods and Results: The strains Aspergillus niger SCBM1 and Aspergillus
fumigatus SCBM6 were cultivated under solid-state fermentation (SSF), with
biomass sorghum (BS) and wheat bran (WB) as lignocellulosic substrates, in
different proportions, along with variable nitrogen sources. The best SSF
condition for the induction of such enzymes was observed employing A. niger
SCBM1 in BS supplemented with peptone; maximum production levels were
achieved as follows: 72 h of fermentation for xylanase and exoglucanase (300 07
and 30 64 U g
1 respectively), 120 h for b-glucosidase and endoglucanase
(54 90 and 41 47 U g
1 respectively) and 144 h for b-xylosidase (64 88 U g
1).
Conclusions: This work demonstrated the viability of the use of BS for the
production of hemi- and cellulolytic enzymes; the high concentration of
celluloses in BS could be associated with the significant production of
cellulases, mainly exoglucanase.
Significance and Impact of the Study: This is the first study which presents
the promising use of biomass sorghum (genetically modified sorghum to
increase its biomass content) as an alternative carbon source for the
production of enzymes by SSF.
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DIAS, L. M. et al. Biomass sorghum as a novel substrate in solid-state fermentation for the production of hemicellulases and cellulases by Aspergillus niger and A. fumigatus. Journal Of Applied Microbiology, v. 124, n. 3, p. 708-718, 2018. Disponível em: <https://onlinelibrary.wiley.com/doi/abs/10.1111/jam.13672>. Acesso em: 05 abr. 2018