Preparation of NiFe 2 O 4 @MIL-101(Fe)/GO as a novel nanocarrier and investigation of its antimicrobial properties.

In this research, we have investigated a novel magnetic nanocomposite including NiFe 2 O 4 @MIL-101(Fe)/GO for the delivery of the antibiotic tetracycline (TC). Moreover, the antibacterial activity of NiFe 2 O 4 @MIL-101(Fe)/GO, NiFe 2 O 4 @MIL-101(Fe)/GO/TC and pure TC was evaluated by agar well diffusion and minimum inhibitory concentration (MIC) methods on both Gram-negative ( Escherichia coli ) and Gram-positive ( Staphylococcus aureus ) bacteria. In addition, the cytotoxicity of NiFe 2 O 4 @MIL-101(Fe)/GO/TC on HeLa cells was determined by an MTT assay which showed good results. The structure of the prepared nanocarrier was investigated by various spectroscopic techniques such as Fourier-transform infrared spectroscopy (FT-IR), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), Brunauer-Emmett-Teller (BET), and thermal gravimetric analysis (TGA). The results of this study showed that 98% of the TC was loaded on the synthesized nanocomposite. Drug release occurred at pH: 7.4 (phosphate buffer saline) and pH: 5.0 (acetate buffer) within 3 days, resulting in 77% and 85% release of the drug, respectively.