Narrow Results

In this research, iron oxide-NPs were synthesized by leek leaves extract using the green method biosynthesis. It helps as reducing and cap agents. Characteristics of nanoparticles are obtained by (UV–Visible) spectroscopy, X-ray diffraction (XRD) and atomic force microscopy (AFM). The X-ray diffraction pattern showed iron oxide peaks, the mean crystalline size was 37.12nm. Electron microscope field emission scanning (FESEM) was used to investigate the morphology of iron oxide-NPs. Results of the biological tests showed how iron oxide nanoparticles affected both gram-positive and gram-negative bacteria, as various inhibitor registrations and the influence of iron material on bacteria inhibition were demonstrated.

This work synthesizes iron oxide nanoparticles using plant extracts of Camellia sinensis, Matricaria chamomilla L., and Artemisia herba-alba Asso. and Punica granatum L. peel. with an evaluation of its antimicrobial activity. Fe₂O₃ nanoparticles (NPs) are highly stable and significantly affect gram-positive and gram-negative bacteria. The synthesized Fe₂O₃ nanoparticles were examined using X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), energy-dispersive X-ray (EDX), Fourier transform infrared spectroscopy (FTIR), zeta potential (ZP), and UV–Vis spectrophotometer analysis (UV–Vis). The band gap ranged between 3.1eV and 3.8eV, which corresponds to the grain size, as its value ranged between 10.77nm and 32.31nm, that is, the smaller the grain size, the higher the band gap. On bacteria, iron oxide nanoparticles have remarkable efficacy in the formation of biofilms for gram-positive, gram-negative bacteria, and fungal.

This research aims to prepare gold nanoparticles by the biological method, using the licorice as a reduced agent, and to investigate the potential of gold nanoparticles as antibacterial agents. Nanoparticles of the distinctive gold peak have been observed at a wavelength of 515–518nm before and after adding the plant extract; this is known as plasmonic surface resonance, where the particles were synthesized and tested using several techniques such as using ultraviolet–visible radiation, zeta potentials, FT-IR, TEM, XRD FTIR measurement detection that shows peaks Absorption at 1388cm${}^{-1}$ C–O extension of a carboxylic acid. TEM measurements show particles with a size of 39nm under ideal conditions, the crystallization phase of the XRD patterns of the produced Au NPs was (38.41, 44.6, 64.72, 77.618), correspond to (111), (200), (220), and (311) plane of metallic Au, confirming the crystal structure of Au. The generated AuNPs are relatively stable, due to the coating process, licorice extract is critical to maintaining the stability of the nanoparticles and preventing them from agglomerating. Compared to the uncoated gold nanoparticles, the coated licorice extract shows a larger zeta capacity (15.8 mV). For two pathogenic bacteria of Streptococcus mutans, Mirabilis proteome was (6–22) and (6–25)mm. The results show that licorice extract can be used for more environmentally friendly production of AuNPs with homogeneous particle sizes.