Thermal stability of a-amylase in systems of different moisture content was investigated. Thermal inactivation kinetics could be accurately described by a first order model in all systems studied except the system of moisture content of 0.029 g H2O/g db showing a biphasic inactivation pattern. Heat stability of the enzyme was significantly increased in systems with reduced moisture content. In ail subsequent systems with reduced moisture content the heat stability of the enzyme was increased and reached maximum value at the lowest moisture content equal to 0.029 g H2O/g db.
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