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Table 5 Effect of various metal ions on the keratinase

From: Isolation and identification of a feather degrading Bacillus tropicus strain Gxun-17 from marine environment and its enzyme characteristics

Metal ion Concentration (M) Residual activity (%) Metal ion Concentration (M) Residual activity (%)
None 100.00 ± 4.75bc    
Na2+ 0.025 96.00 ± 9.64bcd Si2+ 0.025 114.76 ± 9.21b
  0.25 79.38 ± 5.55cde   0.25 116.05 ± 4.77b
  2.5 74.97 ± 2.05cde   2.5 57.48 ± 1.81ef
Mn2+ 0.025 102.97 ± 22.35bc Co2+ 0.025 91.58 ± 11.57bcd
  0.25 260.72 ± 15.56a   0.25 43.89 ± 6.27fg
  2.5 236.62 ± 23.84a   2.5 40.86 ± 4.03fg
Mg2+ 0.025 84.25 ± 0.64cde Al3+ 0.025 96.87 ± 1.25bc
  0.25 83.33 ± 1.87cde   0.25 11.17 ± 1.16h
  2.5 57.89 ± 0.98ef   2.5 21.53 ± 6.69gh
Ca2+ 0.025 84.25 ± 5.00cde Cu2+ 0.025 − 0.37 ± 0.87h
  0.25 75.28 ± 12.16cde   0.25 7.73 ± 2.64h
  2.5 10.45 ± 5.13h   2.5 6.61 ± 2.07h
K+ 0.025 83.74 ± 5.12cde    
  0.25 80.20 ± 0.62cde    
  2.5 67.43 ± 2.40def    
  1. Superscript letter(s) a, b, c, d, e, f, g and h down the column were used to indicate significant difference at P < 0.05