Green Synthesis of Silver-Decorated Magnetic Particles for Efficient and Reusable Antimicrobial Activity

Abstract

Metal and metal hybrid nanostructures have shown tremendous application in the biomedical and catalytic fields because of their plasmonic and catalytic properties. Here, a green and clean method was employed for the synthesis of silver nanoparticle (Ag NP)-SiO2-Fe2O3 hybrid microstructures, and biomolecules from green tea extracts were used for constructing the hybrid structures. The SiO2-Fe2O3 structures were synthesized using an ethanolic green tea leaf extract to form Bio-SiO2-Fe2O3 (BSiO2-Fe2O3) structures. Biochemical studies demonstrated the presence of green tea biomolecules in the BSiO2 layer. Reduction of the silver ions was performed by a BSiO2 layer to form Ag NPs of 5–10 nm in diameter in and on the BSiO2-Fe2O3 microstructure. The reduction process was observed within 600 s, which is faster than that reported elsewhere. The antimicrobial activity of the Ag-BSiO2-Fe2O3 hybrid structure was demonstrated against Staphylococcus aureus and Escherichia coli, and the nanostructures were further visualized using confocal laser scanning microscopy (CLSM). The magnetic properties of the Ag-BSiO2-Fe2O3 hybrid structure were used for studying reusable antimicrobial activity. Thus, in this study, we provide a novel green route for the construction of a biomolecule-entrapped SiO2-Fe2O3 structure and their use for the ultra-fast formation of Ag NPs to form antimicrobial active multifunctional hybrid structures.

Synthesis and Characterization of Citric Acid-Modified Iron Oxide Nanoparticles Prepared with Electrohydraulic Discharge Treatment

“…Among the various inorganic nanoparticles, iron oxide nanoparticles (IONPs) show unique physicochemical properties such as low Curie transition temperature and superparamagnetic nature; they are biocompatible, present low toxicity and show an antimicrobial activity [ 1 , 2 , 3 , 4 , 5 ]. Below a critical diameter, superparamagnetic iron oxide nanoparticles (SPIONs) possess a large constant magnetic moment which can be crucial for biomedical applications [ 6 , 7 , 8 ].…”

Iron Oxide-Au Magneto-Plasmonic Heterostructures: Advances in Their Eco-Friendly Synthesis

“…Usually, the synthesis methods for such hybrid nanoplatforms combine different wet chemistry steps, aimed to induce the nucleation and growth of MNPs and Au NPs, starting from soluble precursors, sometimes using toxic chemicals that can be the cause of potential health and environmental concerns or exposure risks for the operators [ 16 ]. The awareness of the need for developing green synthesis approaches to avoid the problems related to synthesis procedures has therefore stimulated a wide range of simple, low-cost and non-toxic approaches [ 17 , 18 , 19 ].…”