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Table 2 Half life time (T1/2) and heat deactivation constant (k) of cholesterol oxidase produced by Streptomyces aegyptia NEAE 102

From: Purification, characterization and amino acid content of cholesterol oxidase produced by Streptomyces aegyptia NEAE 102

Half life time (min)
 50 °C 156.25
 60 °C 107.27
 70 °C 81.82
 80 °C 80.33
Thermal inactivation rate constant k d 1 (min−1)a
 50 °C 0.0044
 60 °C 0.0065
 70 °C 0.0085
 80 °C 0.0086
D-value (min)
 50 °C 281.25
 60 °C 193.09
 70 °C 147.28
 80 °C 144.60
Thermal inactivation rate constant k d 2 (min−1)b
 50 °C 0.0025
 60 °C 0.0036
 70 °C 0.0047
 80 °C 0.0048
  1. a k d 1 is the deactivation constant after losing 50% of initial activity (at T1/2)
  2. b k d 2 is the deactivation constant after losing 90% of initial activity (at D- value)