TABLE 4.

Extracellular enzyme activities of A. vadensis and A. niger during growth on polymeric carbon sourcesa

Strain and carbon sourceActivity of enzyme (nmol of p-nitrophenol released/min/mg of extracellular protein)b
ABFAGLLACBGLMNDBXL
AN lax59.9 ± 2.4318.8 ± 7.4310.2 ± 17.7492.3 ± 2.649.9 ± 0.3453.5 ± 15.5
AV lax8.2 ± 1.077.6 ± 6.914.5 ± 4.5396.0 ± 11.96.3 ± 0.563.4 ± 8.7
AN awb7.5 ± 0.814.0 ± 0.19.0 ± 0.347.9 ± 6.713.2 ± 1.712.6 ± 1.5
AV awb6.4 ± 0.27.3 ± 0.77.7 ± 0.234.0 ± 2.87.1 ± 0.518.2 ± 1.9
AN gg9.8 ± 0.4253.7 ± 1.3148.2 ± 1.6240.1 ± 5.1132.3 ± 6.368.7 ± 2.8
AV ggND53.0 ± 5.810.3 ± 0.5225.0 ± 7.648.7 ± 4.85.6 ± 0.6
AN cellND48.2 ± 3.3ND35.1 ± 3.9ND3.9 ± 0.4
AV cellNDNDND26.0 ± 2.9NDND
AN bwx55.4 ± 3.5507.2 ± 12.1149.4 ± 4.2331.0 ± 15.86.1 ± 0.3441.2 ± 28.4
AV bwx39.2 ± 2.8140.0 ± 6.31.6 ± 0.2238.8 ± 1.90.7 ± 0.2289.0 ± 13.7
  • a AN, A. niger N402; AV, A. vadensis CBS 113365; lax, crude xylan preparation; awb, alder wood bark; gg, guar gum; cell, cellulose; bwx, birchwood xylan; ABF, α-arabinofuranosidase; AGL, α-galactosidase; LAC, β-galactosidase; BGL, β-glucosidase; MND, β-mannosidase; BXL, β-xylosidase.

  • b Data are means ± standard deviations. ND, not detected.