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Updated: Jan 16, 2026
Magnetic and Thermal-sensitive PolyN-isopropylacrylamide-based Microgels for Magnetically Triggered Controlled Release
Published on: July 4, 2017
An optimized and efficient method for immobilization and stabilization of penicillin G acylase onto PEI-coated
Mohammad Karim Emadzadeh1,2, Hamidreza Pourzamani3, Azadeh Hekmat2
1Department of Nursing, Dehaghan Branch, Islamic Azad University, Dehaghan, Iran.
Objective:
The penicillin G acylase (PGA) enzyme, found in bacteria, yeast, and fungi, is used to produce 6-aminopenicillanic acid (6-APA) and beta-lactam antibiotics. To improve the catalytic activity and reusability of PGA, an efficient immobilization protocol was recruited.
Methods:
In this research, Fe3O4 magnetic nanoparticles (Fe3O4 MNPs) were functionalized through polyethylene imine, and the PGA was immobilized on nanoparticles using a glutaraldehyde linker. The nanoparticles were monodispersed with spherical shape and size of around 35 nm and analyzed by SEM and DLS methods. The optimization process was performed by Design Expert 10.0 software based on the RSM method and CCD design. The immobilization of the enzyme was confirmed by FT-IR.
Results:
At optimal stabilization conditions, the maximum amount of 6-APA intermediate substance was obtained at a temperature of 10 °C and a time of 336 min. The Vmax and Km were obtained around 0.024 and 1.04 mM for free PGA, and 0.47 and 1.53 mM for immobilized PGA. The stabilization increased the maximum speed of penicillin hydrolysis by a 2-fold. The antibiotic ampicillin was synthesized using 6-APA and phenylglycine methyl ester (PGME), and the immobilized enzyme maintained 45.87% of the initial activity after 10 reuse cycles, indicating that the immobilized enzyme had good stability and reusability.
Conclusions:
Overall, our results showed that this nanoparticle could be considered a promising matrix for PGA immobilization, with the advantages of high catalytic efficiency and enhanced stability and reusability.
