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Table 5 Kinetic and thermodynamic parameters of B. licheniformis strain-MA1protease towards thermal processes

From: Stable protease from Bacillus licheniformis-MA1 strain: statistical production optimization, kinetic and thermodynamic characterization, and application in silver recovery from used X-ray films

Parameter

Temperature (°C)

50

60

70

Kd (thermal deactivation constant,/min)

1.17 X10−4

2.99 X10−4

5.55 ×10−4

t0.5 (half-life, h)

98.97

38.69

20.83

D-value (decimal reduction time, h)

328.78

128.53

69.20

Ed (activation energy for thermal denaturation, kJ/mol)

71.89

ΔH* (enthalpy, kJ/mol)

69.21

69.13

69.05

ΔG* (free energy, kJ/mol)

103.64

104.33

105.78

ΔS* (entropy, J/mol/K)

− 0.11

− 0.11

− 0.11