Abstract
Emerging β-lactam antibiotic resistance necessitates the development of new therapeutic approaches. One approach to counteract this issue is the use of nanoparticles (NPs) for antimicrobial agent delivery. In this work, superparamagnetic MnFe2O4 NPs were synthesized via a simple co-precipitation method followed by coating with a SiO2 shell using tetraethoxysilane (TEOS) to prevent agglomeration and also increase the density of hydroxyl groups on the surface of MnFe2O4 NPs. The resulting MnFe2O4@SiO2 nanostructures were further functionalized with 3-aminopropyltriethoxysilane (APTES) to introduce NH2 groups on the surface of NPs for covalent grafting of ampicillin (AMP), β-lactam antibiotic. The MnFe2O4@AMP NPs proved to be highly effective for the eradication of Escherichia coli bacteria with a minimum inhibitory concentration (MIC) equivalent to 4 µg/mL of immobilized AMP, lowered by 50% compared to free AMP. The intrinsic multivalence effect of the nanostructures as well as the protection of the COO− group of the antibiotic from the attack of β-lactamase enzyme is believed to be responsible for enhanced efficiency of the hybrid compared to free AMP.
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Acknowledgements
Authors are sincerely acknowledged the financial support provided by the Centre National de la Recherche Scientifique (CNRS), the University of Lille, the Hauts-de-France region. Authors are also gratefully acknowledged Babol Noshirvani University of Technology throughout Ph.D. Research Grant No.: BNUT/ 945150001/98. This study was part of Ph.D. thesis of Neda Akhlaghi, proposed and approved by Faculty of Chemical Engineering, Noshirvani University of Technology, Babol, Iran. Authors are also gratefully acknowledged Biotechnology Research Institute of Chemical Engineering in Babol Noshirvani University of Technology and Centre National de la Recherche Scientifique in University of Lille for facilitating the present research.
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Akhlaghi, N., Najafpour-Darzi, G., Barras, A. et al. Magnetic MnFe2O4 Core–shell nanoparticles coated with antibiotics for the ablation of pathogens. Chem. Pap. 75, 377–387 (2021). https://doi.org/10.1007/s11696-020-01306-y
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DOI: https://doi.org/10.1007/s11696-020-01306-y