Β-glucosidase production of two different Aspergillus strains

Brumbauer, A. and Réczey, K. (1999) Β-glucosidase production of two different Aspergillus strains. Acta Alimentaria, 28 (4). pp. 361-370. ISSN 0139-3006

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Abstract

Β-glucosidase has an important role in cellulose degradation by cleaving the cellobiose to glucose units. Supplementation of Trichodermacellulase with exogenous β-glucosidase is needed to prevent the inhibition effect of cellobiose on exoglucanases and endoglucanases.Production of β-glucosidase by Aspergillus niger and Aspergillus phoenicishas been investigated under different fermentations. Both strains were appropriate for enzyme production at high level under the applied conditions. Cultivation of A. phoenicison Mandels' medium containing a complex nitrogen source has resulted in a higher β-glucosidase activity than on Vogel's medium. In an air-lift fermenter A. phoenicis grew in the shape of beads with 1.41 IU g–1 cell-associated enzyme activity. The fungal pellets can be used as in situ immobilized enzyme preparation. A. niger produced extracellular β-glucosidase at the level of 2.1 IU ml–1 in stirred-tank fermenter with a yield of 210 IU g–1 glucose and productivity of 21.8 IU l–1 h–1.

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