We propose a new and integrated method for the evaluation of industrial enzymes. The application of this method to the enzyme penicillin G acylase from Kluyvera citrophila shows very interesting industrial prospects. This acylase presents a much better stability against heat, pH or organic cosolvents as compared with the more popular enzyme from Escherichia coli. In addition, this enzyme is very easy to immobilize through its amine groups and to stabilize through multipoint covalent attachment on activated pre-existing supports.