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The main aim of the study, green route to the synthesis of silver nanoparticles (AgNPs) is a new technique that has recently gained popularity due to several advantages over conventional chemical methods. The objective of the study was focused on the green synthesis of AgNPs using  Barleria buxifolia  leaf extract  via  a rapid and eco-friendly ultrasonic-assisted technique. The obtained AgNPs were characterized using ultraviolet–visible (UV–Vis) absorption spectrum of the organically reduced silver showed a surface plasmon peak at 435 nm, characteristic for silver colloidal solutions. UV–Vis absorption spectrum, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy-dispersive X-ray spectroscopy (EDS) analysis showed that the obtained AgNPs were dispersed spheres with a uniform size of 80 nm. Furthermore, the Fourier-transform infrared spectroscopy (FTIR) and X-ray powder diffraction (XRD) analysis indicated that the surface of the obtained AgNPs was covered with organic molecules in plant extracts. Green synthesized AgNPs showed the highest antioxidant, antibacterial and anti-biofilm activity than a plant extract.  In vitro  anticancer assay demonstrated half-maximal inhibitory concentration (IC 50 ) values of 31.42, 30.67, 51.07 and 56.26 µg/mL against MCF-7, HeLa and HepG2 cancer cell lines, respectively, which confirms its potent anticancer action. The biocompatibility of green synthesized AgNPs is confirmed by their lack of cytotoxicity against normal human cells. The potent bioactivity exhibited by the green synthesized AgNPs leads towards the multiple use as antioxidant, antibacterial, anti-biofilm and cytotoxic agent.

Ultra-sonication-enhanced green synthesis of silver nanoparticles using Barleria buxifolia leaf extract and their possible application