In the present case, only 30 fungal strains were high xylanase producers. When some over-producing species of
Aspergillus (as determined by plate screening method) were grown in mineral salt
medium containing 1% (w/v) birchwood xylan as a sole carbon source and assayed (see
materials and methods), only Aspergillus niger MS80 and Aspergillus flavus MS172 were
found to secrete high levels of xylanases (Table 4). Polizeli et al., (2005) reported that a
number of species of Aspergillus possess xylanolytic potential.