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Characteristics of Aspergillus niger xylanases produced on rice husk and wheat bran in submerged culture and solid-state fermentation for an applicability proposal

Characteristics of Aspergillus niger xylanases produced on rice husk and wheat bran in submerged culture and solid-state fermentation for an applicability proposal

International Journal of Food Science & Technology 48(9): 1798-1807

Xylanolytic rich filtrates were obtained by A. niger sp in both submerged and solid-state culture using rice husk or wheat bran as the only carbon source. Filtrates obtained on rice husk showed the highest activities (~6500 and 5200 U g?1, respectively). Independent of carbon source, these filtrates were very stable in an acidic pH range (4 7) and mild temperatures, with high half-life time values (more than 7 h at 50 C) in the corresponding inactivation kinetic models. Also the effect of different metallic ions and denaturing substances was verified finding that these enzymes are not metaloproteins, and metals as Hg2+ and Pb2+ caused the greatest loss of xylanolytic activity (not higher than 30%). Xylanases produced by this A. niger strain showed important features that make them potential candidates for applications on human and livestock food industries.

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Accession: 036888784

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DOI: 10.1111/ijfs.12153

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