[Preparation and kinetic properties of immobilized benzyl penicillin acylase].

An active insoluble preparation of immobilized benzyl penicillin acylase (IBA) EC 3.5.1.11 has been obtained by its entrapping into polyacrylamide gel lattice. Due to immobilization the preparation maintains up to 87% of its initial activity. The kinetics of IBA at low substrate concentrations obeys the Michaelis-Menten law; however, the apparent KM value decreases and the temperature optimum elevates. The inhibition by the reaction products--6-aminopenicillanic acid and phenylacetic acid--has been found to be 4.3 mM. The resultant IBA preparation proves to be suitable for hydrolysis of 5% benzyl penicillin solutions.