Table 6 Comparison of biochemical characterisation of B. tropicus Gxun-17 and some microbial keratinase

B. tropicus Gxun-17

112.57

Mn²⁺ and mercaptoethanol

This study

B. licheniformis ALW1

72.2

–

[8]

Ochrobactrum

117

K⁺, Na⁺, Ca²⁺, Mg²⁺, Dithiothreitol (DTT) and Urea

[13]

Bacillus sp. NKSP-7

139.35

Ca²⁺, Cd²⁺, Na⁺, Mn²⁺, sodium sulfite and mercaptoethanol

[19]

B. zhangzhouensis

117.04

Ca²⁺, K⁺, Na⁺, Mn²⁺ and DTT

[29]

Thermoactinomyces sp. RM4

–

Na⁺, K⁺, DTT, mercaptoethanol and toluene

[32]

B. subtilis P13

–

TritonX 100

[38]

B. subtilis KD-N2

–

SDS, EDTA, DTT, ammonium sulfamate and mercaptoethanol

[40]

B. licheniformis

10.76

Zn²⁺ and Mg²⁺

[45]