Table 2.

Half life time (T_1/2) and heat deactivation constant (k) 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

^a k _d 1 is the deactivation constant after losing 50% of initial activity (at T_1/2)

^b k _d 2 is the deactivation constant after losing 90% of initial activity (at D- value)