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Table 2 Metal ion effect on the stability of keratinase

From: Bacillus sp. CSK2 produced thermostable alkaline keratinase using agro-wastes: keratinolytic enzyme characterization

Metal ion Concentration (mM) Residual activity (%)
None 100 ± 4.24f
Li+ 5 71 ± 1.71e
Na+ 5 71 ± 1.53e
K+ 5 71 ± 4.78e
Ag+ 5 69 ± 3.69e
Ca2+ 5 69 ± 2.34e
Mg2+ 5 68 ± 4.42e
Mn2+ 5 74 ± 1.35e
Zn2+ 5 69 ± 0.81e
Cu2+ 5 45 ± 2.52bc
Fe2+ 5 73 ± 1.62e
Hg2+ 5 43 ± 2.07b
Ba2+ 5 55 ± 3.61d
Co2+ 5 50 ± 1.98cd
Al3+ 5 13 ± 1.35a
Fe3+ 5 12 ± 0.36a
  1. Superscript letter(s) a, b, c, d, e and f down the column were used to indicate significant difference at P < 0.05
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