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Table 1 Comparative study of activating or inhibiting influences caused by metal ions, on the crude phenol oxidase activity of A. chroococcum SBUG 1484 towards the substrate 2,6-DMP (5 mM)

From: Study of enzymatic properties of phenol oxidase from nitrogen-fixing Azotobacter chroococcum

Metal compounda Concentration
(mM)
Relative activity
[%]
None   100
ZnSO4 0.1 84
  1.0 61
FeSO4 0.01 84
  0.1 25
MnSO4 0.1 89
  1.0 87
MgSO4 0.1 110
  1.0 99
CuSO4 0.1 108
  1.0 130
MnCl2 0.1 104
  1.0 86
CoCl2 0.1 98
  1.0 80
CaCl2 0.1 90
  1.0 85
CuCl2 0.1 112
  1.0 78
FeCl3 0.1 108
  1.0 79
NiCl3 0.1 109
  1.0 106
NaMoO4 0.1 105
  1.0 106
H3BO3 0.1 85
  1.0 68
(CH3COO)2Pb 0.1 77
  1.0 64
  1. Shown results are the average of four replicates.
  2. a Effects of CuSO4, CuCl2, FeCl3, NiCl3 and (CH3COO)2Pb were in contrast to other tested metals determined by the oxidation of 5 mM ABTS, further conditions were kept constant.