Immobilization of IMP-1 metallo-beta-lactamase on Fe3O4@SiO2 as nanobiocatalyst for degradation of beta-lactam antibiotics in wastewater
WATER SCIENCE AND TECHNOLOGY
摘要
Residues of antibiotics in water resources and wastewater have been significant environmental and public health problems. The current study developed the high-efficiency enzymatic nanobiocatalyst for the degradation of beta-lactam antibiotics. For this purpose, metallo beta-lactamase IMP-1 was obtained by the cloned bla(IMP) gene overexpressed in the E. coli. 2.6 mg purified enzyme was used for immobilization on the 100 mg modified Fe3O4 @ SiO2 magnetic nanoparticles. Immobilized IMP-1 Showed similar storage stability to the free enzyme. The optimum temperatures and enzyme activity pH for free and immobilized enzymes were 70 degrees C and 60 degrees C, 7.5 and 6.5, respectively. In addition, after 15 reaction cycles, 80 percent of the enzyme activity was retained, according to a reusability analysis of the immobilized enzyme. For free and immobilized enzymes, the highest catalytic activity was observed for penicillin G and cephalexin, whereas Vmax/Km value for ceftriaxone was 3-fold (free enzyme) to 10-fold (immobilized enzyme) lower than for penicillin G (Table 4). Also, the results showed that the immobilized IMP-1 on magnetic nanoparticles has an excellent ability to remove beta-lactam antibiotics from aqueous solutions. Thus, which could be an appropriate choice for removing beta-lactam antibiotics from pharmaceutical industry wastewater.
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关键词
antibiotic removal, enzyme immobilization, nanobiocatalyst, wastewater
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