Green Synthesis of Silver Nanowires Using Aqueous 𝐵𝑟𝑎𝑠𝑠𝑖𝑐𝑎 𝑇𝑜𝑢𝑟𝑛𝑒𝑓𝑜𝑟𝑡𝑖𝑖 Leaves Extract and Evaluation of Their Antibacterial and Antioxidant Activities

In the present study, the structural, antibacterial, and antioxidant properties of silver nanowires (AgNWs) synthesized by a bio-reduction method. Silver nitrate was used as a precursor and aqueous Brassica tournefortii leaves extract as a reducing and template. Silver nanowires were characterized by using XRD, FTIR, UV-Visible, and SEM techniques. XRD confirmed the crystalline and face-centered cubic nature of the AgNWs with an average crystallite size of 16-18 nm. FT-IR spectra confirmed the presence of polyphenols, which are responsible for the reduction of silver ions and the efficient stabilization of silver nanowires. According to the UV-Vis spectrum, the SPR absorption band of AgNWs was observed at 360 nm. The SEM survey shows the obtained nanowires' shape. Silver nanowires showed antibacterial activities especially against Pseudomonas aeruginosa and Streptococcus agalacteae, with respective diameters of inhibition zones (DIZ) measuring 21 mm and 18 mm, respectively. Furthermore, the minimum inhibitory concentration (MIC) of AgNWs against E. coli was determined to be 18.75 μg/mL. The AgNWs demonstrated robust antioxidant activity by ABTS-radical scavenging activity yielded IC50 value of 50.98 μg/mL. These findings strongly suggest the potential of Ag nanowires for various biomedical applications.