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Table 1 Effect of various metal ions, chemical agents and chelating agent on the activity of purified xylanase and the crude enzyme. Results are the mean of three replicates

From: Characterization and identification of the xylanolytic enzymes from Aspergillus fumigatus Z5

Effectors Relative activity (%)
  Endo-1,4-β-xylanase Crude enzyme
Control 100 100
Metal ions (1 mM)   
Li+ 108.9 ± 1.3a 88.5 ± 3.1
Fe3+ 74.9 ± 2.4 91.8 ± 1.2
Fe2+ 102.5 ± 0.8 102.6 ± 0.9
Ba2+ 107.6 ± 2.6 108.1 ± 2.5
Ni2+ 103.9 ± 1.2 89.5 ± 1.1
Mn2+ 86.8 ± 3.2 91.5 ± 3.4
Mg2+ 98.1 ± 1.7 95.7 ± 1.3
Ca2+ 105.7 ± 2.8 100.0 ± 0.8
Al3+ 93.5 ± 0.2 95.1 ± 2.1
Zn2+ 92.2 ± 1.6 96.9 ± 1.7
Co2+ 101.0 ± 1.9 97.6 ± 2.4
Cu2+ 45.5 ± 2.7 69.0 ± 3.8
Surfactants SDS (0.1 %, w/v) 12.8 ± 2.5 66.5 ± 3.2
Triton X-100 (0.05 %, w/v) 101.7 ± 0.5 101.0 ± 1.9
Tween 80 (0.05 %, w/v) 107.6 ± 1.9 101.5 ± 1.7
Clelating agent EDTA (10 mM) 50.6 ± 3.1 80.5 ± 2.4
  1. a Standard deviations of relative activity