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  • Title: Xylanolytic enzyme production by an Aspergillus niger isolate.
    Author: Costa-Ferreira M, Dias A, Máximo C, Morgado MJ, Sena-Martins G, Duarte JC.
    Journal: Appl Biochem Biotechnol; 1994 Mar; 44(3):231-42. PubMed ID: 8198405.
    Abstract:
    Production of xylanolytic enzymes by an Aspergillus niger CCMI 850 isolate was investigated in batch cultures. The effect of the composition of a fermentation medium that did not include chemical inducers, on beta-xylanase, beta-xylosidase, alpha-L-arabinofuranosidase, and total cellulase activity was studied. With 4% xylan as the carbon source, about 65 U/mL of beta-xylanase was obtained, whereas the total cellulase activity was undetectable, under the specified conditions. This beta-xylanase activity represents the highest reported for a wild-type strain of A. niger. The effect of pH and temperature on the activity of beta-xylanase was studied. Partial characterization of the beta-xylanase showed that with insoluble birchwood as substrate the Km and Vmax were 0.3 mM and 19 mumol/min, respectively. Aspects of using the crude beta-xylanase preparation for applications in the pulp and paper industry were discussed.
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