The plant-based biological molecules possess exceptionally controlled assembling properties to make them suitable in the synthesis of metal nanoparticles. In the present study, an efficient simple one-pot method was employed for the synthesis of silver nanoparticles (SNPs) from the Rangoon creeper (RC) aqueous leaf extract. Biomolecules present in the leaf extract play a significant role as reducing agent as well as capping agent in the formation of RC-SNPs. The formation of RC-SNPs was confirmed by using several analytical techniques such as Fourier-transform infrared spectroscopy and ultraviolet-visible spectrophotometer studies. The presence of a sharp surface plasmon resonance peak at 449 nm showed the formation of RC-SNPs. X-ray diffraction analysis showed the crystalline nature of the RC-SNPs with a face-centred cubic structure. Elemental analysis of RC-SNPs was done by using energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy. The morphology of RC-SNPs was examined by transmission electron microscopy (TEM) in the nano range 12 nm, and thermogravimetric-differential thermal analysis demonstrated the mechanical strength of RC-SNPs at various temperatures. The authors' newly synthesised RC-SNPs exhibited significant anti-bacterial activity against Staphylococcus aureus and Escherichia coli.
Objective: The motto of this research work was to synthesize the zinc oxide nanoparticles (ZnONPs) should be environmental friendly. Hence, it receives more attention toward the green route method.Methods: At last, the Ficus racemosa ZnONPs (FR-ZnONPs) were successfully synthesized using a simple protocol and eco favorable technique. This paper highlights the biosynthesis of ZnONPs using leaf extract of F. racemosa. Results: FR-ZnONPs formation was confirmed by the different spectral analysis such as UV-visible spectroscopy, Fourier transform-infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM), and electronic dispersive X-ray spectroscopy. UV-visible studies revealed that the intrinsic band gap absorptions were at 372 nm and photoluminescence study showed that the blue emission at 492, 481, 473, and 450 nm and the green emission at 540 nm, respectively. FR-ZnONPs are wurtzite hexagonal structure with an average grain size of 15 nm was found from XRD analysis.Conclusion: FR-ZnONPs exhibited good antimicrobial efficacy on Escherichia coli and Staphylococcus aureus with various concentrations (100 μg/mL, 75 μg/mL, and 50 μg/mL) by disc diffusion method. The results showed the good antibacterial activity of FR-ZnONPs on G+ve and G-ve bacteria.
Cape gooseberry plant leaf extract mediated iron oxide nanoparticles (CG-IONPs) were prepared for the antibacterial study. The optimum precursor salt concentration, pH of the reaction mixture, the ratio between reducing agent and precursor salt, and time for the synthesis of iron nanoparticles were found to be 5 mM, 9.0, 3:7, and 0th, respectively. The synthesized iron nanoparticles were characterized by UV/Vis absorption spectroscopy, Photoluminescence Spectroscopy (PL), Transmission Electron Microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Thermal Analysis (TG/DTA), and Fourier transform infrared spectroscopy (FTIR). A FTIR measurement was carried out to identify the possible molecules like carbonyl, CH, and OH bands which were responsible for the reduction and formation of the nanoparticles. From the X-ray diffraction (XRD) method, it was found that the average particle size of magnetite nanoparticles was found to be 24.18 nm. TEM analysis has been carried out to determine the size and shape of the synthesized CG-IONPs. The thermal stability of the synthesized CG-IONPs was tested by performing TG/DTA analysis, using a nitrogen atmosphere. XPS analysis was carried out to measure the elemental composition and oxidation states of the elements present in CG-IONPs. The PL analysis has been employed in the present study to explore the luminescent character of CG-IONPs. The synthesized CG-IONPs had antibacterial activity against pathogenic bacteria like Staphylococcus aureus, Streptococcus agalactiae, Escherichia coli, and Salmonella enterica by the well diffusion method. This biosynthesis method has been found to be cost-effective, good for the environment, and likely to be useful in many fields.
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