BMC Biotechnology

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 ± 4.24^f
Li⁺	5	71 ± 1.71^e
Na⁺	5	71 ± 1.53^e
K⁺	5	71 ± 4.78^e
Ag⁺	5	69 ± 3.69^e
Ca²⁺	5	69 ± 2.34^e
Mg²⁺	5	68 ± 4.42^e
Mn²⁺	5	74 ± 1.35^e
Zn²⁺	5	69 ± 0.81^e
Cu²⁺	5	45 ± 2.52^bc
Fe²⁺	5	73 ± 1.62^e
Hg²⁺	5	43 ± 2.07^b
Ba²⁺	5	55 ± 3.61^d
Co²⁺	5	50 ± 1.98^cd
Al³⁺	5	13 ± 1.35^a
Fe³⁺	5	12 ± 0.36^a

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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ISSN: 1472-6750

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